What roof decking is and when it needs attention

Dekoven Roofing

November 13, 2026

Decking is the surface that supports the roofing assembly. Its condition may become clearer after the old roof is removed.

Ask how the crew will document damage and when it will contact you for approval. A clear proposal explains any allowance up front so you know how additional decking work will be priced and recorded.

If you're comparing replacement options, ask Dekoven Roofing for a written estimate for your property.

What decking is

Roof decking, also called sheathing, is the structural surface that roofing is attached to. It is usually plywood or oriented strand board, and it carries the load of the roof and anyone working on it.

When it needs attention

  • Soft or spongy spots when walked on.
  • Dark staining or rot visible from the attic.
  • Sagging between rafters.
  • Damage found after old roofing is removed.
  • Past leaks that may have soaked the wood.

Why it is often decided during tear-off

Much of the decking is hidden under existing roofing. Its real condition often becomes clear once the old roof is off. That is why proposals usually address decking with an allowance or a unit price.

Ask how the crew will document damaged areas and how you will approve additional work.

What to ask

Ask what the proposal assumes about decking, what the unit price is for extra replacement and whether photos will be provided of any replaced areas.

Frequently asked questions

Can decking be repaired instead of replaced?

Small damaged areas are often replaced in sections. The roofer should explain what is needed.

Can I see the decking myself?

Sometimes from the attic. Ask the roofer to show photos from the tear-off.

Who pays for extra decking?

That depends on the proposal. Ask before signing.

Related: Request a replacement estimate

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