| 摘要 |
A building panel having improved shiplap joints to provide complete coverage with while providing for panel expansion and contraction. The building panel includes an overlap adapted to overlie a back portion of the backface of one or more panels laid up in the next higher course. Alternate corners of the building panels have centerlaps portions formed at a plane central to the thickness of the building panel that fit between the space defined by the front overlap and the backunderlap. The centerlaps mate to fill gaps that would otherwise open when the building panels expand and contract.
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