| 摘要 |
A unitary combined backer and siding board is sufficiently thick and strong to eliminate the need for backer boards or plyscore as a substrate on the studs of the walls of a building. The board is standard, commercially available stock with parallel front and rear faces and of uniform thickness of about one and one quarter inches. The upper edge has a front, upstanding tongue of curved cross section which fits in a tongue groove of curved cross section in the lower edge. The upper edge is free of grooving and has a downward sloping surface between the upstanding tongue and the rear face to shed rainwater. A compressible sealing gasket is located between tongue and tongue groove.
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