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Roof deck
The roof deck is the wood sheathing that the roofing materials attach to.
Why it matters
If the roof deck gets wet repeatedly, it rots and weakens the roof system.
Where people get this wrong
A roof can look fine from outside while the deck is slowly failing. Deck problems can come from leaks or from trapped moisture in the attic.
Real-world example
A roofer pulls a shingle and the nail does not bite because the wood is soft. That is the roof deck telling you it has been wet for a long time.
Where this hits your build
This affects how your home handles water. Water damage is one of the most expensive problems to fix, and it often starts with details that seem small.
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