Definition
The flat wood layer nailed across the rafters or trusses that everything else on the roof attaches to. If it's rotted or soft, it must be replaced before new roofing goes down.
Why this term matters for homeowners
In Greater Rochester, roofing terms usually connect to material grade, freeze-thaw and ice-dam risk, and whether repair or replacement is the smarter long-term spend.
- Use this term to ask better follow-up questions during estimates.
- Look for this language in Learn and Evaluate guides to connect definition to decisions.
- Confirm how this applies to your specific roof age, pitch, and home layout.
Related pages
Category: Roofing