Roof Deck

A roof deck is defined as the complete structural surface of a roof, consisting of the sheathing panels (plywood or OSB) fastened to the rafters or trusses, onto which the underlayment and roofing materials are applied. The condition of the roof deck is assessed during tear-off and any damaged, delaminated, or water-damaged sections must be replaced before new materials are installed. Roof deck replacement is priced per sheet (typically 4x8 feet) and adds $75 to $125 per panel to the total roof replacement cost.