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An elongated fibrous insulation blanket is pre-cut for custom fitting the insulation blanket into wall, floor, ceiling and roof cavities of different widths formed by the framework of a building. The blanket has one or more cuts extending for the length of the blanket which separate the blanket into

An elongated fibrous insulation blanket is pre-cut for custom fitting the insulation blanket into wall, floor, ceiling and roof cavities of different widths formed by the framework of a building. The blanket has one or more cuts extending for the length of the blanket which separate the blanket into two or more longitudinally extending sections. Adjacent sections of the blanket are joined together along the cut(s) by separable adhesive connectors which hold together the sections of the blanket for handling, but are separable by hand along the cut(s) so that the blanket can be handled as a unit for insulating a cavity having a predetermined width or easily separated by hand into two or more sections at a cut for insulating a cavity having a lesser width. The pre-cut insulation blanket may have a facing sheet, overlaying and bonded to a major surface of the blanket, that is separable by hand along the cut(s).

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1. A building material, comprising:fibrous insulation having a length, a width, and a depth, wherein the length and the width define first and second major surfaces separated by the depth, the fibrous insulation having at least one cut extending from the first major surface, through the depth, to th

1. A building material, comprising:fibrous insulation having a length, a width, and a depth, wherein the length and the width define first and second major surfaces separated by the depth, the fibrous insulation having at least one cut extending from the first major surface, through the depth, to the second major surface, said cut extending along at least a portion of the length of the fibrous insulation so as to divide the fibrous insulation into a plurality of fibrous insulation strips, wherein the fibrous insulation strips are removably secured across the at least one cut by an adhesive material such that the fibrous insulation may be separated by hand into strips for installation into a cavity. 2. The building material of claim 1, wherein at least one of the fibrous insulation strips has a width of about four inches.3. The building material of claim 1, wherein at least one of the fibrous insulation strips has a width of about three inches.4. The building material of claim 1, wherein at least one of the fibrous insulation strips has a width of about two-and-one-half inches.5. The building material of claim 1, wherein at least one of the fibrous insulation strips has a width of about four-and-one-half inches.6. The building material of claim 1, wherein at least one of the fibrous insulation strips has a width of about five inches.7. The building material of claim 1, wherein the width of the fibrous insulation is about fifteen inches.8. The building material of claim 1, wherein the width of the fibrous insulation is about twenty-three inches.9. The building material of claim 1, further comprising a vapor barrier facing sheet bonded to the first major surface, wherein the facing sheet comprises at least one separable connector aligned with the at least one cut.10. The building material of claim 1, wherein the building material has three cuts that divide the fibrous insulation into four fibrous insulation strips that are each removably secured across at least one of the three cuts by an adhesive material to another of the four fibrous insulation strips such that the fibrous insulation may be separated by hand into strips for installation into a cavity.11. The building material of claim 10, wherein at least two of the fibrous insulation strips have a different width.12. The building material of claim 10, wherein one of the strips has a width of about 2.5 inches, one of the strips has a width of about 4 inches, and one of the strips has a width of about 4.5 inches.13. The building material of claim 10, wherein one of the strips has a width of about 11.5 inches, one of the strips has a width of about 4 inches, and one of the strips has a width of about 3.5 inches.14. A fibrous insulation assembly having a length, a width, and a depth, wherein the length and the width define first and second major surfaces separated by the depth, the fibrous insulation assembly comprising:at least one cut extending from the first major surface, through the depth, to the second major surface, said cut extending along at least a portion of the length of the fibrous insulation assembly so as to divide the fibrous insulation into a plurality of fibrous insulation strips; and discontinuous adhesive strip means for removably securing each of the fibrous insulation strips to at least one other of the fibrous insulation strips across the at least one cut such that the fibrous insulation assembly may be separated by hand into strips for installation into a cavity. 15. The fibrous insulation assembly of claim 14, further comprising a vapor barrier facing sheet bonded to the first major surface, wherein the facing sheet comprises at least one separable connector aligned with the at least one cut.16. The fibrous insulation assembly of claim 14, wherein at least one of the fibrous insulation strips has a width of about four inches.17. The fibrous insulation assembly of claim 14, wherein at least one of the fibrous insulation strips has a width of about three inches.18. The fibrous insulation assembly of claim 14, wherein at least one of the fibrous insulation strips has a width of about two-and-one-half inches.19. The fibrous insulation assembly of claim 14, wherein at least one of the fibrous insulation strips has a width of about four-and-one-half inches.20. The fibrous insulation assembly of claim 14, wherein at least one of the fibrous insulation strips has a width of about five inches.21. The fibrous insulation assembly of claim 14, wherein the width of the fibrous insulation assembly is about fifteen inches.22. The fibrous insulation assembly of claim 14, wherein the width of the fibrous insulation assembly is about twenty-three inches.23. The fibrous insulation assembly of claim 14, wherein the fibrous insulation assembly has three cuts that divide the fibrous insulation assembly into four fibrous insulation strips that are each removably secured across at least one of the three cuts by the discontinuous adhesive strip means to another of the four fibrous insulation strips such that the fibrous insulation may be separated by hand into strips for installation into a cavity.24. The fibrous insulation assembly of claim 23, wherein at least two of the fibrous insulation strips have a different width.