Roofing cost guide
Roof Decking Replacement Cost in 2026: Sheathing Price Guide
Roof decking replacement typically costs $75 to $115 per 4x8 sheet installed. Compare OSB vs CDX plywood and whole-roof re-sheathing costs.
Last reviewed: October 2026
Cost Snapshot
$75 – $115 per 4x8 sheet installed
Replacing damaged roof decking typically costs $75 to $115 per 4x8 sheet installed for 7/16-inch OSB or 1/2-inch CDX plywood during a re-roofing project ($18–$38 material-only). Most homes need between 2 and 6 sheets replaced ($180–$690). Re-decking an entire 2,000 sq ft roof (60 sheets) costs between $4,500 and $6,900 in total.
Typical planning range based on the published references reviewed for this guide. Use it to prepare questions and compare written, itemized contractor proposals. Actual costs vary with project scope, materials, access, permits, and local conditions.
Parts vs. Labor Breakdown
| Component | Typical range | What it covers |
|---|---|---|
| Materials / equipment | $20 – $40 | APA-rated 7/16" OSB sheathing ($18–$28/sheet) or 1/2" 4-ply CDX exterior plywood ($24–$38/sheet), H-clips for panel edge support, and 8d ring-shank framing nails. |
| Labor | $45 – $75 | Carpenter or roofer cutting out rotted wood with circular saw, sistering damaged rafters if necessary, measuring, and pneumatic nailing at 6" edge / 12" field spacing. Benchmark: BLS reports a May 2025 national median wage of $26.65 per hour for roofers (10th to 90th percentile: $18.01 to $39.29). That is what an employee earns; the hourly rate used here is what a contractor bills, which also covers insurance, equipment, overhead, and margin. |
| Permits | $0 – $100 | Decking replacement performed during re-roofing is covered under the primary re-roof permit. Extensive rafter structural work may trigger plan amendment fees. |
| Disposal | $5 – $15 | Disposal of rotted, moldy, or delaminated plywood sheets in the active jobsite roll-off dumpster. |
| supplies additional | $5 – $10 | Galvanized framing fasteners, panel clips, and polyurethane subfloor adhesive where required. |
Cost by Roof Size & Scope
| Size / scope | Typical coverage | Estimated installed cost | Average |
|---|---|---|---|
| Spot Repair: 2 Sheets | Minor localized leak / pipe boot rot | $150 – $240 | $180 |
| Typical Repair: 4 Sheets | Average discovered rot along eaves or valley | $300 – $460 | $360 |
| Moderate Re-Sheathing: 10 Sheets | Long-term leak or failed flashing section | $750 – $1,150 | $900 |
| Major Re-Sheathing: 25 Sheets | Half of small roof or large plane | $1,875 – $2,875 | $2,250 |
| Complete Re-Decking: 60 Sheets | Entire home conversion from spaced plank/cedar | $4,500 – $6,900 | $5,400 |
Cost by Material & Method
| Type | Spec | Typical cost | Details |
|---|---|---|---|
| 7/16-inch OSB (Oriented Strand Board) | Standard Code Grade | $75 – $95 per sheet installed | Engineered wood strands bonded with exterior waterproof resin. Most common residential roof sheathing code standard. |
| 1/2-inch CDX Exterior Plywood | Premium Wood Grade | $85 – $115 per sheet installed | Cross-laminated wood veneer core with exterior glue. Greater moisture resilience, less edge swelling than OSB. |
| 5/8-inch Fire-Rated Plywood | Heavy Commercial / Code Spec | $105 – $150 per sheet installed | Heavy structural decking required for high-snow zones or fire-code separations near lot lines and townhomes. |
| Radiant Barrier OSB (Foil-Faced) | Energy Efficiency Grade | $95 – $130 per sheet installed | Decking backed with perforated aluminum foil on attic side, reflecting up to 97% of solar radiant heat. |
Additional Line Items Often Needed
| Item | Typical cost | Necessity | Notes |
|---|---|---|---|
| Rafter / Truss Sistering (Wood Framing) | $100 – $250 per rafter | As Needed | Required if structural rafter lumber rotted beneath chronic leaks. |
| Fascia Board Replacement | $15 – $30 per linear foot | As Needed | Installed behind gutters where water wicked under eave flashing. |
Frequently Asked Questions
How much does it cost to replace roof decking per sheet?
Replacing roof decking costs $75 to $115 per 4x8 sheet installed for standard 7/16-inch OSB or 1/2-inch CDX plywood during a re-roofing project. The materials cost $18 to $38 per sheet, with labor accounting for $45 to $75.
What is better for roof decking: OSB or plywood?
Both meet international residential building codes. OSB is slightly less expensive ($18–$28 vs. $24–$38 retail) and offers consistent density without voids. CDX plywood holds fasteners slightly better in high-wind regions and dries out faster if minor condensation occurs.
How do you know if roof decking needs to be replaced?
Rotted or delaminated roof decking is discovered during tear-off when boards appear blackened from mold, feel spongy when walked on, or crumble under fastener pressure. Most homes over 20 years old require 2 to 4 sheets replaced.
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How we estimate these planning ranges and the sources we review.