Roof Anatomy
What is Decking?
Roofing Glossary · Roof Anatomy
Definition
Also called sheathing, the decking is the structural boards or panels — typically 7/16" or 1/2" OSB or plywood — fastened to the rafters or trusses to form the continuous surface on which all roofing materials are installed. The decking must be solid, flat, and free of rot before new roofing is applied. Damaged decking is often discovered during tear-off and adds to replacement cost.
Related Roofing Terms
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SheathingA synonym for roof decking — the layer of structural panels (OSB or plywood) attached to the roof fr...
→RafterOne of a series of sloped structural members that extend from the ridge board at the peak to the wal...
→TrussA prefabricated triangular structural framework of wood members used to support the roof deck and tr...
→UnderlaymentA water-resistant or waterproof barrier material installed directly over the roof decking and beneat...
→Tear-OffThe complete removal of existing roofing materials — shingles, underlayment, and sometimes damaged d...
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