| 摘要 |
A dual-purpose backerboard member is provided which has a weakening line dividing it longitudinally into two sections, and which has a barrier sheeting bonded to one face of the cellular backerboard except along the weakening line. The panel member can readily be split along the weakening line without damage to the barrier sheeting laminated thereto, due to the provision of the unbonded zone. The backer member can be used intact for a single-lap siding panel; alternatively it can be split and assembled with a double-lap panel, in which assembly the two sections are overlapped and hingedly interconnected by the bridging web of the sheeting, and are installed against the offset wall portions of the panel.
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