Professional roof decking replacement commonly falls around $2,600 to $9,000, with larger or steep roofs going higher. Installed sheathing often runs roughly $1 to $7 per square foot depending on the system.
Roof decking cost by type
| Sheathing type | Planning range | Typical use |
|---|---|---|
| Solid | $2–$5 / sq. ft. | Most common continuous roof deck |
| Open | $1–$3 / sq. ft. | Specialized assemblies with gaps |
| Plank | $3–$7 / sq. ft. | Older or more labor-intensive construction |
What moves the final price?
How much wood is damaged
Replacing ten bad sheets is very different from rebuilding most of the roof deck.
OSB vs. plywood
Material choice changes both raw material cost and structural performance.
Roof pitch & access
Steep or multi-story roofs increase labor and safety time.
Timing during reroofing
Decking is easiest to inspect and replace once the old roof covering is already removed.
When decking replacement is usually necessary
- Soft, sagging, or visibly rotten sheathing.
- Long-term roof leaks that soaked the wood.
- Fasteners no longer hold securely.
- Older plank systems that do not meet the new roof system's needs.
If decking damage is found during replacement, also compare your overall budget with our roof replacement cost guide and roof tear-off cost guide.
Related guides
FAQ
How much does roof decking cost per square foot?
Common installed ranges are roughly $1 to $7 per square foot depending on sheathing type and job conditions.
Can roofers know the exact decking cost before tear-off?
Not always. Some damage is hidden until shingles and underlayment are removed, which is why good quotes often list a per-sheet or per-square-foot decking allowance.
Is roof decking the same as roof sheathing?
Yes. In residential roofing, the terms are often used interchangeably for the structural layer beneath the roof covering.