What Happens If Damaged Roof Decking Is Found?

Damaged decking is discovered once old roofing is torn off and the plywood underneath is exposed, and it has to be replaced before new roofing can go on. This typically adds to the final cost of the job since it is not always visible before tear-off begins. A reputable roofer will document the damage with photos and communicate any added cost before proceeding.

Why decking damage often is not visible before tear-off

Roof decking sits underneath the shingles, underlayment and any prior layers of roofing, so it cannot be fully inspected until the old materials are removed. Water intrusion around flashing, nail holes or aging underlayment can quietly rot the plywood over years without visible signs from the attic or the roof surface.

What replacement decking costs

Decking is typically priced per sheet of plywood replaced, so a small area of soft decking around a chimney or valley adds a modest amount, while widespread rot across the roof adds significantly more. This is one of the most common reasons a final invoice differs from an initial quote, which we cover in our what affects roof cost guide.

How a trustworthy roofer handles it

You should be shown photos of any damaged decking before it is replaced, and given a clear cost for the additional work before your crew proceeds. Nobody should be replacing decking on your roof without documenting it first. If your roof damage is storm related, our roof insurance claims help guide explains how decking damage sometimes factors into a claim, though coverage always depends on your policy and carrier.