초록 ▼

The facing of a faced insulation layer has Z-folded, double-folded, or single-folded lateral tabs extending the length of the facing sheet along or spaced inwardly from lateral edges of the facing sheet. Each lateral tab has multiple segments. One of the segments of each lateral tab has an adhesive

The facing of a faced insulation layer has Z-folded, double-folded, or single-folded lateral tabs extending the length of the facing sheet along or spaced inwardly from lateral edges of the facing sheet. Each lateral tab has multiple segments. One of the segments of each lateral tab has an adhesive thereon that can be exposed and extended beyond one of the lateral edges of the insulation layer for bonding the faced insulation layer to a framing member. Where the blanket is separable into sections, the facing has pairs of separable tabs that separate when the blanket is separated to expose surfaces of the separable tabs with adhesive thereon. The adhesive may be microencapsulated or have microencapsulated constituent(s).

대표청구항 ▼

1. A facing for application to a major surface of an insulation layer, comprising:a facing sheet; the facing sheet having a length and a width; the facing sheet having first and second major surfaces; the first major surface of the facing sheet to be applied and bonded to a major surface of an insul

1. A facing for application to a major surface of an insulation layer, comprising:a facing sheet; the facing sheet having a length and a width; the facing sheet having first and second major surfaces; the first major surface of the facing sheet to be applied and bonded to a major surface of an insulation layer; the facing sheet having Z-folded lateral tabs extending the length of the facing sheet along lateral edges of the facing sheet; each Z-folded lateral tab having first, second and third segments; the first segment of each lateral tab being joined to the second segment of each lateral tab along a first fold line and the second segment of each lateral tab being joined to the third segment of each lateral tab along a second fold line; the first segment of each lateral tab overlaying the second segment of each lateral tab; the second segment of each lateral tab overlaying the third segment of each lateral tab which is to rest on the major surface of an insulation layer to which the facing sheet is bonded; and a surface of the second segment of each lateral tab that is overlaid by the first segment of each lateral tab having an adhesive thereon whereby when the third segment of either of the lateral tabs is pulled laterally outward the first and second segments of that lateral tab are pulled apart to expose the surface of the second segment of that lateral tab having the adhesive thereon. 2. The facing for application to a major surface of an insulation layer according to claim 1, wherein:the first major surface of the facing sheet has an adhesive thereon intermediate the lateral tabs to bond the facing sheet to a major surface of an insulation layer. 3. The facing for application to a major surface of an insulation layer according to claim 1, wherein:the adhesive on the second segment of each lateral tab is a pressure-sensitive adhesive. 4. The facing for application to a major surface of an insulation layer according to claim 3, wherein:the surface of the first segment of each lateral tab that overlays the surface of the second segment of that lateral tab with the pressure-sensitive adhesive thereon has a release means. 5. The facing for application to a major surface of an insulation layer according to claim 1, wherein:the adhesive on the second segment of each lateral tab comprises a base adhesive, with sufficient adhesive strength to hold the first and second segments of the tab together, which contains a microencapsulated pressure-sensitive adhesive to be released by rupturing the microcapsules. 6. The facing for application to a major surface of an insulation layer according to claim 1, wherein:the adhesive on the second segment of each lateral tab comprises a base adhesive, with sufficient adhesive strength to hold the first and second segments of the tab together, that contains one or more microencapsulated additional adhesive constituents to be released by rupturing the microcapsules to react with the base adhesive and/or another released, previously microencapsulated additional adhesive constituent to form an adhesive with greater bonding strength than the base adhesive. 7. The facing for application to a major surface of an insulation layer according to claim 1, wherein:the facing sheet has a pair of longitudinally extending separable tabs; the pair of separable tabs being spaced inwardly from the lateral edges of the facing sheet and extending from the second major surface of the facing sheet; each of the separable tabs having an unexposed surface with an adhesive thereon; and the pair of separable tabs being separable from each other when pulled apart by hand to longitudinally separate the facing sheet into two pieces and to expose the adhesive on the surfaces of the pair of separable tabs. 8. The facing for application to a major surface of an insulation layer according to claim 7, wherein:the facing sheet comprises first and second sheets and an edge portion on the first sheet and an edge portion on the second sheet form the pair of separable tabs on the facing sheet. 9. The facing for application to a major surface of an insulation layer according to claim 7, wherein:a fold in the facing sheet forms the pair of separable tabs of the facing sheet with the pair of separable tabs being separably joined together along a separable fold line. 10. The facing for application to a major surface of an insulation layer according to claim 7, wherein:the adhesive on the pair of separable tabs is a pressure-sensitive adhesive. 11. The facing for application to a major surface of an insulation layer according to claim 7, wherein:the adhesive on the pair of separable tabs comprises a base adhesive, with sufficient adhesive strength to hold the pair of separable tabs together, which contains a microencapsulated pressure-sensitive adhesive to be released by rupturing the microcapsules. 12. The facing for application to a major surface of an insulation layer according to claim 7, wherein:the adhesive on the pair of separable tabs comprises a base adhesive, with sufficient adhesive strength to hold the pair of tabs together, that contains one or more microencapsulated additional adhesive constituents to be released by rupturing the microcapsules to react with the base adhesive and/or another released, previously microencapsulated additional adhesive constituent to form an adhesive with greater bonding strength than the base adhesive. 13. The facing for application to a major surface of an insulation layer according to claim 7 wherein:the adhesive on the second segment of each lateral tab and the adhesive on the pair of separable tabs is the same adhesive. 14. The facing for application to a major surface of an insulation layer according to claim 7 wherein:the adhesive on the second segment of each lateral tab and the adhesive on the pair of separable tabs are the different adhesives. 15. The facing for application to a major surface of an insulation layer according to claim 7, wherein:the adhesive on the second segment of each lateral tab is a pressure-sensitive adhesive. 16. The facing for application to a major surface of an insulation layer according to claim 15, wherein:the surface of the first segment of each lateral tab that overlays the surface of the second segment of that lateral tab with the pressure-sensitive adhesive thereon has a release means. 17. The facing for application to a major surface of an insulation layer according to claim 7, wherein:the adhesive on the second segment of each lateral tab comprises a base adhesive, with sufficient adhesive strength to hold the first and second segments of the tab together, which contains a microencapsulated pressure-sensitive adhesive to be released by rupturing the microcapsules. 18. The facing for application to a major surface of an insulation layer according to claim 7, wherein:the adhesive on the second segment of each lateral tab comprises a base adhesive, with sufficient adhesive strength to hold the first and second segments of the tab together, that contains one or more microencapsulated additional adhesive constituents to be released by rupturing the microcapsules to react with the base adhesive and/or another released, previously microencapsulated additional adhesive constituent to form an adhesive with greater bonding strength than the base adhesive. 19. Faced building insulation, comprising:an insulation layer; the insulation layer having a length, a width, and a thickness; the insulation layer having a first major surface and a second major surface that each extend for the length and the width of the insulation layer; the insulation layer having lateral surfaces extending between lateral edges of the first and second major surfaces; a facing sheet overlaying the first major surface of the insulation layer; the facing sheet having first and second major surfaces; the first major surface of the facing sheet being bonded to the first major surface of the insulation layer; the facing sheet being substantially coextensive with the first major surface of the insulation layer; the facing sheet having Z-folded lateral tabs extending the length of the facing sheet along lateral edges of the facing sheet; each Z-folded lateral tab having first, second and third segments; the first segment of each lateral tab being joined to the second segment of each lateral tab along a first fold line and the second segment of each lateral tab being joined to the third segment of each lateral tab along a second fold line; the first segment of each lateral tab overlaying the second segment of each lateral tab; the second segment of each lateral tab overlaying the third segment of each lateral tab which rests on the first major surface of the insulation layer adjacent the lateral edges of the first major surface of the insulation layer; and a surface of the second segment of each lateral tab that is overlaid by the first segment of each lateral tab having an adhesive thereon whereby when the third segment of either of the lateral tabs is pulled laterally outward the first and second segments of that lateral tab are pulled apart to expose the surface of the second segment of that lateral tab having the adhesive thereon beyond one of the lateral edges of the first major surface of the insulation layer. 20. The faced building insulation according to claim 19, wherein:the insulation layer is a fibrous insulation blanket. 21. The faced building insulation according to claim 19, wherein:the adhesive on the second segment of each lateral tab is a pressure-sensitive adhesive. 22. The faced building insulation according to claim 21, wherein:the surface of the first segment of each lateral tab that overlays the surface of the second segment of that lateral tab with the pressure-sensitive adhesive thereon has a release means. 23. The faced building insulation according to claim 19, wherein:the adhesive on the second segment of each lateral tab comprises a base adhesive, with sufficient adhesive strength to hold the first and second segments of the tab together, which contains a microencapsulated pressure-sensitive adhesive to be released by rupturing the microcapsules. 24. The faced building insulation according to claim 19, wherein:the adhesive on the second segment of each lateral tab comprises a base adhesive, with sufficient adhesive strength to hold the first and second segments of the tab together, that contains one or more microencapsulated additional adhesive constituents to be released by rupturing the microcapsules to react with the base adhesive and/or another released, previously microencapsulated additional adhesive constituent to form an adhesive with greater bonding strength than the base adhesive. 25. The faced building insulation according to claim 19 wherein:the insulation layer has first and second longitudinally extending sections of lesser widths than the insulation layer which each extend for the length of the insulation layer; the first and second sections of the insulation layer being joined to each other by separable means spaced inwardly from the lateral surfaces of the insulation layer and extending along the length of the insulation layer; the separable means holding together the first and second sections of the insulation layer for handling and being separable by hand whereby the insulation layer can be handled as a unit for insulating a cavity having a width about equal to the width of the insulation layer or easily separated by hand into sections at the separable means for insulating a cavity having a lesser width; and the facing sheet has a pair of longitudinally extending separable tabs; the pair of separable tabs being spaced inwardly from the lateral edges of the facing sheet and being aligned longitudinally with the separable means of the insulation layer; the pair of separable tabs extending from the second major surface of the facing sheet; each of the separable tabs having an unexposed surface with an adhesive thereon; and the pair of separable tabs being separable from each other by hand along the separable means of the insulation layer to longitudinally separate the facing sheet into two pieces and to expose the surfaces of the pair of separable tabs having the adhesive thereon whereby when the insulation layer is pulled apart to separate the insulation layer between the first and second sections the facing sheet is also separated and the surfaces of the separable tabs having the adhesive thereon are exposed for application to a framing member. 26. The faced building insulation according to claim 25, wherein:the facing sheet comprises first and second sheets and an edge portion on the first sheet and an edge portion on the second sheet form the pair of separable tabs on the facing sheet. 27. The faced building insulation according to claim 25, wherein:a fold in the facing sheet forms the pair of separable tabs of the facing sheet with the pair of separable tabs being separably joined together along a separable fold line. 28. The faced building insulation according to claim 25, wherein:the adhesive on the pair of separable tabs comprises a pressure-sensitive adhesive. 29. The faced building insulation according to claim 25, wherein:the adhesive on the pair of separable tabs comprises a base adhesive, with sufficient adhesive strength to hold the pair of separable tabs together, which contains a microencapsulated pressure-sensitive adhesive to be released by rupturing the microcapsules. 30. The faced building insulation according to claim 25, wherein:the adhesive on the pair of separable tabs comprises a base adhesive, with sufficient adhesive strength to hold the pair of tabs together, that contains one or more microencapsulated additional adhesive constituents to be released by rupturing the microcapsules to react with the base adhesive and/or another released, previously microencapsulated additional adhesive constituent to form an adhesive with greater bonding strength than the base adhesive. 31. The faced building insulation according to claim 25 wherein:the adhesive on the second segment of each lateral tab and the adhesive on the pair of separable tabs are the different adhesives. 32. The faced building insulation according to claim 19, wherein:the insulation layer is a fibrous insulation blanket; the fibrous insulation blanket has first and second longitudinally extending sections of lesser widths than the fibrous insulation blanket which each extend for the length of the fibrous insulation blanket; the first and second sections of the fibrous insulation blanket being joined to each other by separable means spaced inwardly from the lateral surfaces of the fibrous insulation blanket and extending along the length of the fibrous insulation blanket; the separable means holding together the first and second sections of the fibrous insulation blanket for handling and being separable by hand whereby the fibrous insulation blanket can be handled as a unit for insulating a cavity having a width about equal to the width of the fibrous insulation blanket or easily separated by hand into sections at the separable means for insulating a cavity having a lesser width; and the facing sheet has a pair of longitudinally extending separable tabs; the pair of separable tabs being spaced inwardly from the lateral edges of the facing sheet and being aligned longitudinally with the separable means of the fibrous insulation blanket; the pair of separable tabs extending from the second major surface of the facing sheet; each of the separable tabs having an unexposed surface with an adhesive thereon; and the pair of separable tabs being separable from each other by hand along the separable means of the fibrous insulation blanket to longitudinally separate the facing sheet into two pieces and to expose the surfaces of the pair of separable tabs having the adhesive thereon whereby when the fibrous insulation blanket is pulled apart to separate the fibrous insulation blanket between the first and second sections the facing sheet is also separated and the surfaces of the separable tabs having the adhesive thereon are exposed for application to a framing member. 33. A facing for application to a major surface of an insulation layer, comprising:a facing sheet; the facing sheet having a length and a width; the facing sheet having first and second major surfaces; the facing sheet having double-folded lateral tabs and a barrier sheet portion extending between the lateral tabs; the first major surface of the barrier sheet portion of the facing sheet to be applied and bonded to a major surface of an insulation layer; the lateral tabs extending the length of the facing sheet along lateral edges of the barrier sheet portion of the facing sheet; each lateral tab having first, second and third segments; the first segment of each lateral tab being a lateral edge portion of the barrier sheet portion of the facing sheet; the first segment being joined to the second segment of each lateral tab along a first fold line and the second segment of each lateral tab being joined to the third segment of each lateral tab along a second fold line; the second segment of each lateral tab overlaying the third segment of each lateral tab; the third segment of each lateral tab overlaying the first segment of each lateral tab; and a surface of the third segment of each lateral tab that opposes and overlays the first segment of each lateral tab having an adhesive thereon whereby when the third segment of either of the lateral tabs is pulled laterally outward the second and third segments of that lateral tab are pulled apart to expose the surface of the third segment of that lateral tab having the adhesive thereon. 34. The facing for application to a major surface of an insulation layer according to claim 33, wherein:the first major surface of the barrier sheet portion of the facing sheet has an adhesive thereon to bond the facing sheet to a major surface of an insulation layer. 35. The facing for application to a major surface of an insulation layer according to claim 33, wherein:the adhesive on the third segment of each lateral tab is a pressure-sensitive adhesive. 36. The facing for application to a major surface of an insulation layer according to claim 35, wherein:the surface of the first segment of each lateral tab that is overlaid by the surface of the third segment of each lateral tab with the pressure-sensitive adhesive thereon has a release means. 37. The facing for application to a major surface of an insulation layer according to claim 35, wherein:the adhesive on the third segment of each lateral tab comprises a base adhesive, with sufficient adhesive strength to hold the third and first segments of the tab together, which contains a microencapsulated pressure-sensitive adhesive to be released by rupturing the microcapsules. 38. The facing for application to a major surface of an insulation layer according to claim 33, wherein:the adhesive on the third segment of each lateral tab comprises a base adhesive, with sufficient adhesive strength to hold the third and first segments of the tab together, that contains one or more microencapsulated additional adhesive constituents to be released by rupturing the microcapsules to react with the base adhesive and/or another released, previously microencapsulated additional adhesive constituent to form an adhesive with greater bonding strength than the base adhesive. 39. The facing for application to a major surface of an insulation layer according to claim 33, wherein:the facing sheet has a pair of longitudinally extending separable tabs; the pair of separable tabs being spaced inwardly from the lateral edges of the facing sheet and extending from the second major surface of the facing sheet; each of the separable tabs having an unexposed surface with an adhesive thereon; and the pair of separable tabs being separable from each other when pulled apart by hand to longitudinally separate the facing sheet into two pieces and to expose the adhesive on the surfaces of the pair of separable tabs. 40. The facing for application to a major surface of an insulation layer according to claim 39, wherein:the facing sheet comprises first and second sheets and an edge portion on the first sheet and an edge portion on the second sheet form the pair of separable tabs on the facing sheet. 41. The facing for application to a major surface of an insulation layer according to claim 39, wherein:a fold in the facing sheet forms the pair of separable tabs of the facing sheet with the pair of separable tabs being separably joined together along a separable fold line. 42. Faced building insulation, comprising:an insulation layer; the insulation layer having a length, a width, and a thickness; the insulation layer having a first major surface and a second major surface that each extend for the length and the width of the insulation layer; the insulation layer having lateral surfaces extending between lateral edges of the first and second major surfaces; and a facing sheet overlaying and being substantially coextensive with the first major surface of the insulation layer; the facing sheet having first and second major surfaces; the facing sheet having double-folded lateral tabs and a barrier sheet portion extending between the lateral tabs; the first major surface of the barrier sheet portion of the facing sheet being bonded to the first major surface of the insulation layer; the lateral tabs extending the length of the facing sheet along lateral edges of the barrier sheet portion of the facing sheet; each lateral tab having first, second and third segments; the first segment of each lateral tab being a lateral edge portion of the barrier sheet portion of the facing sheet; the first segment being joined to the second segment of each lateral tab along a first fold line; the second segment of each lateral tab being joined to the third segment of each lateral tab along a second fold line; the second segment of each lateral tab overlaying the third segment of each lateral tab; the third segment of each lateral tab overlaying the first segment of each lateral tab; and a surface of the third segment of each lateral tab that opposes and overlays the first segment of each lateral tab having an adhesive thereon whereby when the second and third segments of either of the lateral tabs are pulled laterally outward and folded about the first fold line to extend along one of the lateral surfaces of the insulation layer, the second and third segments of that lateral tab are pulled apart to expose the surface of the third segment of that lateral tab having the adhesive thereon and the surface of the third segment of that lateral tab having the adhesive thereon faces outwardly away from the one lateral surface of the insulation layer. 43. A facing for application to a major surface of an insulation layer, comprising:a facing sheet; the facing sheet having a length and a width; the facing sheet having first and second major surfaces; the facing sheet having Z-folded lateral tabs and a barrier sheet portion extending between the lateral tabs; the first major surface of the barrier sheet portion of the facing sheet is to be applied and bonded to a major surface of an insulation layer; the lateral tabs extending the length of the facing sheet along lateral edges of the barrier sheet portion of the facing sheet; each lateral tab having first, second and third segments; the first segment of each lateral tab being joined to the second segment of each lateral tab along a first fold line; the second segment of each lateral tab being joined to the third segment of each lateral tab along a second fold line; the first segment of each lateral tab overlays and is bonded to the second major surface of the barrier sheet portion of the facing sheet; the first segment of each lateral tab being spaced inwardly from an adjacent lateral edge of the barrier sheet portion of the facing sheet; the second segment of each lateral tab overlaying the first segment of each lateral tab and having a width about equal to or greater than one half of the spacing of the first segment of the lateral tab from the adjacent lateral edge of the barrier sheet portion of the facing sheet; the third segment of the lateral tab overlaying the second segment of the lateral tab and extending laterally beyond the second segment to overlay part or all of that portion of the barrier sheet portion of the facing sheet between the first segment of the lateral tab and the adjacent lateral edge of the barrier sheet portion of the facing sheet; a surface of that portion of the third segment of the lateral tab that extends laterally beyond the second segment of the lateral tab having an adhesive separably bonding the third segment of the lateral tab to that portion of the barrier sheet portion of the facing sheet between the first segment of the lateral tab and the adjacent lateral edge of the barrier sheet portion of the facing sheet whereby when the third segment of the lateral tab is pulled laterally outward to unfold the lateral tab, the portion of the surface of the third segment with the adhesive thereon extends laterally beyond the barrier sheet portion of the facing sheet. 44. The facing for application to a major surface of an insulation layer according to claim 43, wherein:the first major surface of the barrier sheet portion of the facing sheet has an adhesive thereon to bond the facing sheet to a major surface of an insulation layer. 45. The facing for application to a major surface of an insulation layer according to claim 43, wherein:the adhesive on the third segment of each lateral tab is a pressure-sensitive adhesive. 46. The facing for application to a major surface of an insulation layer according to claim 45, wherein:the surface of the barrier sheet portion that is overlaid by the surface of the third segment of each lateral tab with the pressure-sensitive adhesive thereon has a release means. 47. The facing for application to a major surface of an insulation layer according to claim 43, wherein:the adhesive on the third segment of each lateral tab comprises a base adhesive, with sufficient adhesive strength to hold the third and first segments of the tab together, which contains a microencapsulated pressure-sensitive adhesive to be released by rupturing the microcapsules. 48. The facing for application to a major surface of an insulation layer according to claim 43, wherein:the adhesive on the third segment of each lateral tab comprises a base adhesive, with sufficient adhesive strength to hold the third and first segments of the tab together, that contains one or more microencapsulated additional adhesive constituents to be released by rupturing the microcapsules to react with the base adhesive and/or another released, previously microencapsulated additional adhesive constituent to form an adhesive with greater bonding strength than the base adhesive. 49. The facing for application to a major surface of an insulation layer according to claim 43, wherein:the facing sheet has a pair of longitudinally extending separable tabs; the pair of separable tabs being spaced inwardly from the lateral edges of the facing sheet and extending from the second major surface of the facing sheet; each of the separable tabs having an unexposed surface with an adhesive thereon; and the pair of separable tabs being separable from each other when pulled apart by hand to longitudinally separate the facing sheet into two pieces and to expose the adhesive on the surfaces of the pair of separable tabs. 50. The facing for application to a major surface of an insulation layer according to claim 49, wherein:the facing sheet comprises first and second sheets and an edge portion on the first sheet and an edge portion on the second sheet form the pair of separable tabs on the facing sheet. 51. The facing for application to a major surface of an insulation layer according to claim 49, wherein:a fold in the facing sheet forms the pair of separable tabs of the facing sheet with the pair of separable tabs being separably joined together along a separable fold line. 52. Faced building insulation, comprising:an insulation layer; the insulation layer having a length, a width, and a thickness; the insulation layer having a first major surface and a second major surface that each extend for the length and the width of the insulation layer; the insulation layer having lateral surfaces extending between lateral edges of the first and second major surfaces; and a facing sheet overlaying and being substantially coextensive with the first major surface of the insulation layer; the facing sheet having first and second major surfaces; the facing sheet having Z-folded lateral tabs and a barrier sheet portion extending between the lateral tabs; the first major surface of the barrier sheet portion of the facing sheet being bonded to the first major surface of the insulation layer; the lateral tabs extending the length of the facing sheet along lateral edges of the barrier sheet portion of the facing sheet; each lateral tab having first, second and third segments; the first segment of each lateral tab being joined to the second segment of each lateral tab along a first fold line; the second segment of each lateral tab being joined to the third segment of each lateral tab along a second fold line; the first segment of each lateral tab overlays and is bonded to the second major surface of the barrier sheet portion of the facing sheet; the first segment of each lateral tab being spaced inwardly from an adjacent lateral edge of the barrier sheet portion of the facing sheet and the adjacent lateral edge of the major surface of the insulation layer; the second segment of each lateral tab overlaying the first segment of each lateral tab and having a width about equal to or greater than one half of the spacing of the first segment of the lateral tab from the adjacent lateral edge of the barrier sheet portion of the facing sheet; the third segment of the lateral tab overlaying the second segment of the lateral tab and extending laterally beyond the second segment to overlay part or all of that portion of the barrier sheet portion of the facing sheet between the first segment of the lateral tab and the adjacent lateral edge of the barrier sheet portion of the facing sheet; a surface of that portion of the third segment of the lateral tab that extends laterally beyond the second segment of the lateral tab having an adhesive separably bonding the third segment of the lateral tab to that portion of the barrier sheet portion of the facing sheet between the first segment of the lateral tab and the adjacent lateral edge of the barrier sheet portion of the facing sheet whereby when the third segment of the lateral tab is pulled laterally outward to unfold the lateral tab, the portion of the surface of the third segment with the adhesive thereon extends laterally beyond the barrier sheet portion of the facing sheet and the adjacent lateral edge of the major surface of the insulation layer. 53. A facing for application to a major surface of an insulation layer, comprising:a facing sheet; the facing sheet having a length and a width; the facing sheet having first and second major surfaces; the facing sheet having Z-folded lateral tabs and a barrier sheet portion extending between the lateral tabs; the first major surface of the barrier sheet portion of the facing sheet is to be applied and bonded to a major surface of an insulation layer; the lateral tabs extending the length of the facing sheet along lateral edges of the barrier sheet portion of the facing sheet; each lateral tab having first, second and third segments; the first segment of each lateral tab being a lateral edge portion of the barrier sheet portion of the facing sheet; the first segment of each lateral tab being joined to the second segment of each lateral tab along a first fold line; the second segment of each lateral tab being joined to the third segment of each lateral tab along a second fold line; with each lateral tab in its folded state, the first fold line joining the first segment and the second segment of each lateral tab is at a lateral edge of the facing sheet; the second segment of each lateral tab overlaying the first segment of each lateral tab; the third segment of each lateral tab overlaying the second segment of each lateral tab; the second and third segments having substantially equal widths; a surface of the third segment of each lateral tab that overlays the second segment of each lateral tab having an adhesive thereon separably bonding the third segment to the second segment whereby when the third segment of either lateral tab is pulled laterally outward to unfold the lateral tab, the surface of the third segment with the adhesive thereon extends laterally beyond the lateral edge of the facing sheet defined by the first fold line with the lateral tab in its folded state. 54. The facing for application to a major surface of an insulation layer according to claim 53, wherein:the first major surface of the barrier sheet portion of the facing sheet has an adhesive thereon to bond the facing sheet to a major surface of an insulation layer. 55. The facing for application to a major surface of an insulation layer according to claim 53, wherein:the adhesive on the third segment of each lateral tab is a pressure-sensitive adhesive. 56. The facing for application to a major surface of an insulation layer according to claim 55, wherein:the surface of the second segment that is overlaid by the surface of the third segment of each lateral tab with the pressure-sensitive adhesive thereon has a release means. 57. The facing for application to a major surface of an insulation layer according to claim 53, wherein:the adhesive on the third segment of each lateral tab comprises a base adhesive, with sufficient adhesive strength to hold the third and first segments of the tab together, which contains a microencapsulated pressure-sensitive adhesive to be released by rupturing the microcapsules. 58. The facing for application to a major surface of an insulation layer according to claim 53, wherein:the adhesive on the third segment of each lateral tab comprises a base adhesive, with sufficient adhesive strength to hold the third and first segments of the tab together, that contains one or more microencapsulated additional adhesive constituents to be released by rupturing the microcapsules to react with the base adhesive and/or another released, previously microencapsulated additional adhesive constituent to form an adhesive with greater bonding strength than the base adhesive. 59. The facing for application to a major surface of an insulation layer according to claim 53, wherein:the facing sheet has a pair of longitudinally extending separable tabs; the pair of separable tabs being spaced inwardly from the lateral edges of the facing sheet and extending from the second major surface of the facing sheet; each of the separable tabs having an unexposed surface with an adhesive thereon; and the pair of separable tabs being separable from each other when pulled apart by hand to longitudinally separate the facing sheet into two pieces and to expose the adhesive on the surfaces of the pair of separable tabs. 60. The facing for application to a major surface of an insulation layer according to claim 59, wherein:the facing sheet comprises first and second sheets and an edge portion on the first sheet and an edge portion on the second sheet form the pair of separable tabs on the facing sheet. 61. The facing for application to a major surface of an insulation layer according to claim 59, wherein:a fold in the facing sheet forms the pair of separable tabs of the facing sheet with the pair of separable tabs being separably joined together along a separable fold line. 62. Faced building insulation, comprising:an insulation layer; the insulation layer having a length, a width, and a thickness; the insulation layer having a first major surface and a second major surface that each extend for the length and the width of the insulation layer; the insulation layer having lateral surfaces extending between lateral edges of the first and second major surfaces; and a facing sheet overlaying and being substantially coextensive in length with the first major surface of the insulation layer; lateral edges of the facing sheet being spaced inwardly from the lateral edges of the first major surface of the insulation layer; the facing sheet having first and second major surfaces; the facing sheet having Z-folded lateral tabs and a barrier sheet portion extending between the lateral tabs; the first major surface of the barrier sheet portion of the facing sheet being bonded to the first major surface of the insulation layer; the lateral tabs extending the length of the facing sheet along lateral edges of the barrier sheet portion of the facing sheet; the first segment of each lateral tab being a lateral edge portion of the barrier sheet portion of the facing sheet; the first segment of each lateral tab being joined to the second segment of each lateral tab along a first fold line; the second segment of each lateral tab being joined to the third segment of each lateral tab along a second fold line; with each lateral tab in its folded state, the first fold line joining the first segment and the second segment of each lateral tab is at one of the lateral edges of the facing sheet; the second segment of each lateral tab overlaying the first segment of each lateral tab; the third segment of each lateral tab overlaying the second segment of each lateral tab; the second and third segments having substantially equal widths; a surface of the third segment of each lateral tab that overlays the second segment of each lateral tab having an adhesive thereon separably bonding the third segment to the second segment whereby when the third segment of either lateral tab is pulled laterally outward to unfold the lateral tab, the surface of the third segment with the adhesive thereon extends laterally beyond the adjacent lateral edge of the first major surface of the insulation layer. 63. A facing for application to a major surface of an insulation layer, comprising:a facing sheet; the facing sheet having a length and a width; the facing sheet having first and second major surfaces; the facing sheet only one single-folded lateral tab and a barrier sheet portion; the first major surface of the barrier sheet portion of the facing sheet is to be applied and bonded to a major surface of an insulation layer; the lateral tab extending the length of the facing sheet along a lateral edge of the barrier sheet portion of the facing sheet; the lateral tab having first and second segments; the first segment of the lateral tab being a lateral edge portion of the barrier sheet portion of the facing sheet; the first segment of the lateral tab being joined to the second segment of the lateral tab along a first fold line; with the lateral tab in its folded state, the first fold line joining the first segment and the second segment of the lateral tab is at a lateral edge of the facing sheet; the second segment of the lateral tab overlaying the first segment of the lateral tab; a surface of the second segment of the lateral tab that overlays and opposes the first segment of the lateral tab having an adhesive thereon separably bonding the second segment to the first segment whereby when the second segment of the lateral tab is pulled laterally outward to unfold the lateral tab, the surface of the second segment with the adhesive thereon extends laterally beyond the lateral edge of the facing sheet defined by the first fold line with the lateral tab in its folded state. 64. The facing for application to a major surface of an insulation layer according to claim 63, wherein:the first major surface of the barrier sheet portion of the facing sheet has an adhesive thereon to bond the facing sheet to a major surface of an insulation layer. 65. The facing for application to a major surface of an insulation layer according to claim 63, wherein:the adhesive on the second segment of the lateral tab is a pressure-sensitive adhesive. 66. The facing for application to a major surface of an insulation layer according to claim 65, wherein:the surface of the first segment that is overlaid by the surface of the second segment of the lateral tab with the pressure-sensitive adhesive thereon has a release means. 67. The facing for application to a major surface of an insulation layer according to claim 63, wherein:the adhesive on the second segment of the lateral tab comprises a base adhesive, with sufficient adhesive strength to hold the third and first segments of the tab together, which contains a microencapsulated pressure-sensitive adhesive to be released by rupturing the microcapsules. 68. The facing for application to a major surface of an insulation layer according to claim 63, wherein:the adhesive on the second segment of the lateral tab comprises a base adhesive, with sufficient adhesive strength to hold the third and first segments of the tab together, that contains one or more microencapsulated additional adhesive constituents to be released by rupturing the microcapsules to react with the base adhesive and/or another released, previously microencapsulated additional adhesive constituent to form an adhesive with greater bonding strength than the base adhesive. 69. The facing for application to a major surface of an insulation layer according to claim 63, wherein:the facing sheet has a pair of longitudinally extending separable tabs; the pair of separable tabs being spaced inwardly from the lateral edges of the facing sheet and extending from the second major surface of the facing sheet; each of the separable tabs having an unexposed surface with an adhesive thereon; and the pair of separable tabs being separable from each other when pulled apart by hand to longitudinally separate the facing sheet into two pieces and to expose the adhesive on the surfaces of the pair of separable tabs. 70. The facing for application to a major surface of an insulation layer according to claim 69, wherein:the facing sheet comprises first and second sheets and an edge portion on the first sheet and an edge portion on the second sheet form the pair of separable tabs on the facing sheet. 71. The facing for application to a major surface of an insulation layer according to claim 69, wherein:a fold in the facing sheet forms the pair of separable tabs of the facing sheet with the pair of separable tabs being separably joined together along a separable fold line. 72. Faced building insulation, comprising:an insulation layer; the insulation layer having a length, a width, and a thickness; the insulation layer having a first major surface and a second major surface that each extend for the length and the width of the insulation layer; the insulation layer having lateral surfaces extending between lateral edges of the first and second major surfaces; and a facing sheet overlaying and being substantially coextensive with the first major surface of the insulation layer; the facing sheet having first and second major surfaces; the facing sheet having only one single-folded lateral tab and a barrier sheet portion; the first major surface of the barrier sheet portion of the facing sheet being bonded to a major surface of an insulation layer; the lateral tab extending the length of the facing sheet along a lateral edge of the barrier sheet portion of the facing sheet; the lateral tab having first and second segments; the first segment of the lateral tab being a lateral edge portion of the barrier sheet portion of the facing sheet; the first segment of the lateral tab being joined to the second segment of the lateral tab along a first fold line; with the lateral tab in its folded state, the first fold line joining the first segment and the second segment of the lateral tab is at a lateral edge of the facing sheet and the first major surface of the insulation layer; the second segment of the lateral tab overlaying the first segment of the lateral tab; a surface of the second segment of the lateral tab that overlays and opposes the first segment of the lateral tab having an adhesive thereon separably bonding the second segment to the first segment whereby when the second segment of the lateral tab is pulled laterally outward to unfold the lateral tab and extended along one of the lateral surfaces of the insulation layer, the surface of the second segment with the adhesive thereon faces outwardly away from the lateral surface the insulation layer that the second segment overlays. 73. Faced building insulation, comprising:a first faced building insulation layer comprising an insulation layer; the insulation layer having a length, a width, and a thickness; the insulation layer having a first major surface and a second major surface that each extend for the length and the width of the insulation layer; the insulation layer having lateral surfaces extending between lateral edges of the first and second major surfaces; and a facing sheet overlaying and being substantially coextensive with the first major surface of the insulation layer; the facing sheet having first and second major surfaces; the facing sheet having only one single-folded lateral tab and a barrier sheet portion; the first major surface of the barrier sheet portion of the facing sheet being bonded to a major surface of an insulation layer; the lateral tab extending the length of the facing sheet along a lateral edge of the barrier sheet portion of the facing sheet; the lateral tab having first and second segments; the first segment of the lateral tab being a lateral edge portion of the barrier sheet portion of the facing sheet; the first segment of the lateral tab being joined to the second segment of the lateral tab along a first fold line; a surface of the second segment of the lateral tab having an adhesive thereon; the second segment of the lateral tab extending along one of the lateral surfaces of the insulation layer with the surface of the second segment with the adhesive thereon facing outwardly away from the lateral surface of the insulation layer that the second segment overlays; a second faced building insulation layer identical to the first faced building insulation layer except the second faced building insulation layer has only one lateral tab located at a lateral edge of a first major surface of an insulation layer that is an opposite lateral edge to the lateral edge of the first major surface of the insulation layer of the first faced building insulation layer where the lateral tab of the first faced building insulation layer is located; a second segment of the lateral tab of the second faced building insulation layer extending along a lateral surface of the insulation layer of the second faced building insulation layer; and the second segment of the lateral tab of the first faced building insulation layer being separably bonded to the second segment of the lateral tab of the second faced building insulation layer. 74. A facing for application to a major surface of an insulation layer, comprising:a facing sheet; the facing sheet having a length and a width; the facing sheet having first and second major surfaces; the first major surface of the facing sheet to be applied and bonded to a major surface of a fibrous insulation blanket; the facing sheet having lateral tabs extending the length of the facing sheet along lateral edges of the facing sheet; a surface of each lateral tab having an adhesive thereon for securing the facing sheet to a framing member; the adhesive comprising a microencapsulated pressure-sensitive adhesive to be released by rupturing the microcapsules; the adhesive on each lateral tab having no separate release liner thereon to be removed prior to bonding the lateral tab to a frame member; and the facing sheet having a air of longitudinally extending separable tabs the air of separable tabs being spaced inwardly from the lateral edges of the facing sheet and extending from the second major surface of the facing sheet; each of the separable tabs having an unexposed surface with an adhesive thereon; and the pair of separable tabs being separable from each other when pulled apart by hand to longitudinally separate the facing sheet into two pieces and to expose the adhesive on the surfaces of the pair of separable tabs. 75. A facing for application to a major surface of an insulation layer, comprising:a facing sheet; the facing sheet having a length and a width; the facing sheet having first and second major surfaces; the first major surface of the facing sheet to be applied and bonded to a major surface of a fibrous insulation blanket; the facing sheet having lateral tabs extending the length of the facing sheet along lateral edges of the facing sheet; a surface of each lateral tab having an adhesive thereon for securing the facing sheet to a framing member the adhesive comprising one or more microencapsulated adhesive constituents to be released by rupturing the microcapsules to react another adhesive constituent to form an adhesive; the adhesive on each lateral tab having no separate release liner thereon to be removed prior to bonding the lateral tab to a frame member; and the facing sheet has a pair of longitudinally extending separable tabs; the pair of separable tabs being spaced inwardly from the lateral edges of the facing sheet and extending from the second major surface of the facing sheet; each of the separable tabs having an unexposed surface with an adhesive thereon; and the pair of separable tabs being separable from each other when pulled apart by hand to longitudinally separate the facing sheet into two pieces and to expose the adhesive on the surfaces of the pair of separable tabs.