How is roof-deck damage confirmed?
The roof deck is hidden by the covering and underlayment. Removal can reveal damage that was not visible from above; photos and a marked area make the condition and proposed repair clear.
What should decking replacement include?
Identify the sheathing area to replace, the materials and fastening approach specified for the roof assembly, and how adjoining layers will be restored. The proposal should state any unit price or allowance for concealed damage.
How do I approve added decking work?
Review the exposed condition, affected area, price and schedule change before the deck is covered. GAF’s shingle FAQ and overlay guidance explain why deck condition can remain hidden until roofing is opened.

