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An underlayment with improved drainage is disclosed. Particularly, the invention relates to an underlayment board having a first surface and a second surface, wherein the board further includes a top edge and a bottom edge and includes at least one channel defined in the first surface with each of t

An underlayment with improved drainage is disclosed. Particularly, the invention relates to an underlayment board having a first surface and a second surface, wherein the board further includes a top edge and a bottom edge and includes at least one channel defined in the first surface with each of the at least one channel extending from the top edge to the bottom edge to form a drainage path therebetween. More particularly, the underlayment board can include at least one funnel defined proximate at least the top edge or the bottom edge, wherein the at least one funnel is in fluid communication with a corresponding one of the at least one channel. A method of finishing an exterior of a structural substrate and a building assembly are also disclosed.

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1. An underlayment for exterior finish material, the underlayment comprising: a board having a first surface and a second surface, the board further including a top edge and a bottom edge;at least one channel defined in the first surface, each of the at least one channel extending from proximate the

1. An underlayment for exterior finish material, the underlayment comprising: a board having a first surface and a second surface, the board further including a top edge and a bottom edge;at least one channel defined in the first surface, each of the at least one channel extending from proximate the top edge to proximate the bottom edge to form a drainage path therebetween; andat least one funnel defined proximate the top edge, the at least one funnel in fluid communication with a corresponding one of the at least one channel. 2. The underlayment of claim 1, wherein the top edge and the bottom edge each includes a support surface defined between two adjacent channels against which an adjacent underlayment board can engage. 3. The underlayment of claim 1, wherein the funnel has a first cross dimension exposed at the top edge and a second cross dimension at the channel, the first cross dimension being greater than the second cross dimension. 4. The underlayment of claim 1, including a plurality of funnels, each funnel in fluid communication with a corresponding one of the at least one channel. 5. The underlayment of claim 1, further comprising at least one inverted funnel defined proximate the bottom edge, the at least one inverted funnel in fluid communication with a corresponding one of the at least one channel, the inverted funnel having a first cross dimension exposed at the bottom edge and a second cross dimension at the channel, the first cross dimension greater than the second cross dimension. 6. The underlayment of claim 1, the board having a thickness between the first surface and the second surface; each of the at least one channel having a depth between about 5% and 75% of the thickness of the board. 7. The underlayment of claim 1, wherein the board is a single-piece construction. 8. The underlayment of claim 1, wherein the board is made of a polymer material. 9. The underlayment of claim 8, wherein the polymer material is selected from the group consisting of polyisocyanurate foam, polyurethane foam, expanded polystyrene, and extruded polystyrene. 10. The underlayment of claim 9, wherein the polymer material is extruded polystyrene. 11. The underlayment of claim 1, wherein the board is a laminate including a first layer defining the first surface and a second layer defining the second surface. 12. The underlayment of claim 1, wherein the second surface includes at least one channel defined in the second surface, each of the at least one channel extending from the top edge to the bottom edge to form a drainage path therebetween. 13. The underlayment of claim 1, wherein the second surface is generally planar and free of channels. 14. The underlayment of claim 13, further comprising a film layer on the second surface. 15. The underlayment of claim 1, wherein at least one of the top and bottom edges is angled toward the first surface. 16. The underlayment of claim 1, wherein the at least one channel is a plurality of channels and wherein each channel interconnects with its adjacent channels. 17. A building assembly comprising: a structural substrate having a generally vertical face;an underlayment including a board having a first surface and a second surface, the board further including a top edge and a bottom edge, the board having at least one channel defined in the first surface, each of the at least one channel extending from proximate the top edge to proximate the bottom edge to form a drainage path therebetween, the board further having at least one funnel defined proximate the top edge, the at least one funnel in fluid communication with a corresponding one of the at least one channel, the board disposed with the second surface facing the face of the structural substrate; andan exterior finish material secured adjacent and substantially covering the first surface of the underlayment board with the underlayment board sandwiched between the structural substrate and the exterior finish material. 18. The building assembly of claim 17, wherein the top edge and the bottom edge of the underlayment board each includes a support surface defined between two adjacent channels against which an adjacent underlayment board can engage. 19. The building assembly of claim 17, wherein the underlayment board further includes at least one inverted funnel defined proximate the bottom edge, the at least one inverted funnel in fluid communication with a corresponding one of the at least one channel, the inverted funnel having a first cross dimension exposed at the bottom edge and a second cross dimension at the channel, the first cross dimension greater than the second cross dimension. 20. The building assembly of claim 17, further having opposing side edges, wherein at least one of the opposing side edges of the underlayment board includes an engagement surface against which a corresponding side edge of an adjacent underlayment board can be engaged. 21. The building assembly of claim 20, wherein the engagement surface is shaped to interlock with a corresponding side edge of an adjacent underlayment board. 22. The building assembly of claim 17, wherein the second surface of the underlayment board is generally planar and free of channels. 23. The building assembly of claim 17, wherein the at least one channel is a plurality of channels and wherein each channel interconnects with its adjacent channels. 24. The building assembly of claim 17, wherein the underlayment board further includes a film layer on the first surface. 25. The building assembly of claim 17, further comprising a second underlayment board of similar construction, the second underlayment board having an edge disposed against at least one edge of the first underlayment board. 26. The building assembly of claim 17, wherein the second surface of the underlayment board includes at least one channel defined in the second surface, each of the at least one channel extending from the top edge to the bottom edge to form a drainage path therebetween. 27. A method of finishing an exterior of a structural substrate having a generally vertical face comprising: providing an underlayment including a board having a first surface and a second surface, the board further including a top edge and a bottom edge, the board having at least one channel defined in the first surface, each of the at least one channel extending from proximate the top edge to proximate the bottom edge to form a drainage path therebetween, the board further having at least one funnel defined proximate the top edge, the at least one funnel in fluid communication with a corresponding one of the at least one channel,disposing the underlayment board with the second surface facing the face of the structural substrate, the at least one channel being aligned generally vertically; andsecuring an exterior finish material adjacent and substantially covering the first surface of the underlayment board with the underlayment board sandwiched between the structural substrate and the exterior finish material. 28. The method of finishing an exterior of a structural substrate of claim 27, wherein the structural substrate is the frame of a building structure. 29. The method of finishing an exterior of a structural substrate of claim 27, wherein the structural substrate is a sheathing. 30. The method of finishing an exterior of a structural substrate of claim 27, wherein the structural substrate is an existing exterior finish material. 31. The method of finishing an exterior of a structural substrate of claim 27, wherein the second surface of the underlayment board includes at least one channel defined in the second surface, each of the at least one channel extending from the top edge to the bottom edge to form a drainage path therebetween.