Re-decking is the replacement of some or all of a roof's wood decking, discovered and done during a tear-off once the old shingles and underlayment are stripped away. Rotted, soft, or delaminated boards are cut out and replaced with new plywood or OSB before new underlayment and shingles go on, since nailing a roof to compromised wood undermines the whole installation. Because the extent of decking damage cannot be known until tear-off, re-decking is usually priced per sheet after the old roof is off, not as a fixed number in the original estimate.
Re-decking happens at one specific point in a roof replacement: after the old shingles and underlayment have been torn off and the wood decking underneath is fully exposed for the first time.
Only at that stage can a crew actually see and test the condition of the deck, pressing and walking each section to find boards that have gone soft, rotted, or delaminated from years of trapped moisture or a slow, undetected leak.
Any board that fails that check gets cut out and replaced with new plywood or OSB, matched to the thickness of the surrounding deck, before underlayment or shingles go back down over it. Well-run crews photograph each replaced section as a record of what was found and fixed.
Skipping this step when it is needed does real damage to the new roof's lifespan. Shingles nailed over soft or rotted wood cannot hold fasteners properly, and the new roof can start failing in the exact spots the old decking was already compromised, regardless of how good the new shingles are.
Because the amount of bad decking genuinely cannot be known until tear-off, most honest estimates quote a per-sheet price for re-decking rather than a guessed lump sum, and the final bill reflects what was actually found and replaced.
Re-decking is the part of a replacement estimate that rewards close reading. A clear per-sheet price, photos of any boards replaced, and a straightforward explanation of what was found separate an honest process from one where hidden decking problems become a surprise add-on.
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