What Happens If We Find Damaged Roof Decking?

If Greenlee uncovers damaged decking during a roof replacement, we stop the affected work, protect the roof from the weather, and explain the finding and price before proceeding. We don't install new roofing over rotten wood.

That conversation matters because the wood beneath a roof isn't always fully visible during the first inspection. A clear replacement proposal should explain how unexpected work will be handled, so a discovery during tear-off doesn't first reach you as a charge on the final invoice.

What is roof decking?

Decking, also called sheathing, is the wood surface beneath the roofing materials. On many homes, it consists of plywood or oriented strand board, usually called OSB. The underlayment and shingles sit above it.

When moisture has weakened the decking, that damage needs attention before new roofing goes over it. GAF's guide to roof decking explains the layer's role and why damaged sections may need replacement during a reroof.

Why it may stay hidden until tear-off

An initial roof inspection can reveal warning signs, including soft areas or evidence that water has been getting in. It doesn't expose every part of the wood underneath the existing roof.

Tear-off removes the old roofing materials and gives the crew a closer look at that surface. Sometimes the exposed wood confirms what the inspection suggested. Sometimes it reveals damage that couldn't be seen beforehand.

Finding one damaged area doesn't tell us that every section needs replacing. The work should follow the condition of the exposed decking and the extent of the problem. You should be able to understand what needs attention and why.

What Greenlee does when the work changes

Our approach starts with explaining the discovery while the project is underway.

1. Stop work in the affected area. We don't continue covering wood that needs attention.
2. Protect the roof from the weather. The crew secures the affected work as we work through the next steps.
3. Explain what we found and the additional price. You hear about the change before the affected work proceeds.

In our recorded discussion about honest estimates, we describe this as a communication responsibility. If tear-off reveals a need for more sheathing, we need to tell the homeowner promptly and explain what it means for the job.

A finding can change the work. It should also start a conversation with you.

Is decking replacement included in the estimate?

Look at the written proposal. An estimate may identify known decking work, describe how concealed damage will be handled, or include an allowance. Ask which applies to your job and what the price covers.

Before signing, these questions are worth answering:

• Does the proposal include any decking replacement already identified during the inspection?
• How would additional materials and labor be priced?
• Who will contact me if the crew finds concealed damage?
• How will a change be recorded and confirmed with me?
• Could the extra work affect the schedule?

If a proposal lists a price per sheet, ask what that number includes. Materials, removal, labor, and disposal should be clear enough that you can understand the additional charge. If it uses an allowance, ask what happens when the work falls below or exceeds that allowance.

For the rest of the proposal, our guide to comparing roof replacement estimates explains the other items to review.

How to prepare before work begins

Share any history of leaks, earlier repairs, or recurring interior stains during the inspection. Those details can help us understand what you've been seeing, even though they can't reveal every concealed condition.

Once the job is scheduled, make sure your production contact has a reliable way to reach you. Keep the proposal and any agreed changes together with the project paperwork.

Greenlee offers free roof inspections and written proposals for homeowners in Bend and Central Oregon. We can explain the planned work and how a discovery beneath the old roof would be handled before the project begins.