Homeowner guide
Roof Decking Replacement: What Homeowners Should Know
Decking, also called sheathing, is the wood layer under your shingles. It is often hidden until the old roof is removed, so decking repair is a common question during a replacement.
The short answer: Homeowners usually pay for a roof with savings, a home equity loan or line of credit, a personal loan, financing offered through the roofing company, or an insurance payout when the damage is covered. The right choice depends on the total cost of borrowing, not the monthly payment, so compare the interest rate, fees and payoff terms in writing before you commit.
What decking is
Decking is usually plywood or OSB panels nailed to the rafters. Shingles and underlayment attach to it. If the deck is weak or wet, the new roof cannot be fastened properly.
Signs of deck damage
- Soft or spongy spots when walked on by a roofer.
- A sagging roof line.
- Dark stains or mold from the attic side.
- Shingles that will not stay flat.
How it is handled during a replacement
A good estimate explains how damaged decking will be handled. Many contractors state a per-sheet price for replacing bad boards, so you know the cost before work begins rather than being surprised.
Ask that replaced boards be photographed and counted so you can verify the charge.
Why not just cover it
Nailing new shingles over damaged decking can lead to early failure and may void a warranty. Local building codes also set requirements for roof sheathing.
Roof decking questions
Is decking replacement included in a roof estimate?
Often it is not, because it cannot be seen until tear-off. Ask for a per-sheet price in writing.
Plywood or OSB?
Both are used and both are approved. Thickness and condition matter more than type.
Can wet decking be dried?
Slightly damp decking can sometimes dry, but rotted or delaminated boards should be replaced.
Related:
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