OSB vs Plywood: Cost, Strength & When to Use Each
OSB and plywood are the two most common structural sheathing panels — but they differ significantly in cost, moisture behavior, and best applications.
Head-to-Head Comparison
| Aspect | OSB | Plywood |
|---|---|---|
| Cost (7/16" 4×8 sheet) | $12–16 | $18–28 |
| Structural strength | Equal (span-rated) | Equal (span-rated) |
| Moisture resistance | Swells, slow to dry | Better, dries faster |
| Edge swell | Significant | Minimal |
| Weight (½") | ~48 lbs/sheet | ~46 lbs/sheet |
| Nail/screw holding | Good | Slightly better |
| Spans | Rated same as ply | Rated same as OSB |
| Environmental | Uses smaller trees | Requires larger logs |
Pros & Cons
OSB
- ✓25–40% cheaper than plywood
- ✓Consistent density throughout — no voids or knots
- ✓Made from fast-growing small-diameter trees
- ✓Passes same structural ratings as plywood
- ✕Absorbs moisture and swells at edges — hard to reverse
- ✕Heavier than plywood for the same thickness
- ✕Doesn't re-dry as quickly after rain exposure
- ✕Harder to identify damage once painted or covered
Plywood
- ✓Dries faster after moisture exposure
- ✓Better for high-humidity environments
- ✓Holds fasteners through multiple removals
- ✓Easier to see delamination or damage
- ✕20–40% more expensive than OSB
- ✕Can have internal voids in lower grades
- ✕Requires larger-diameter logs
- ✕Veneers can delaminate in prolonged moisture
Cost Breakdown
Price per sheet (2026)
OSB (7/16", 4×8) runs $12–16 per sheet at most lumber yards. Plywood (½", 4×8 CDX) runs $18–28. On a 2,000 sq ft house needing ~600 sheets of sheathing, OSB saves $3,600–7,200 in materials alone. That difference matters on large projects.
Long-term cost
The long-term cost difference is minimal if installation is done correctly. OSB that stays dry performs as well as plywood for the life of the building. The risk is construction-phase moisture exposure: OSB left wet too long before roofing or siding can lead to edge swelling that causes problems with finishing materials.
Bottom Line
OSB wins on price and is perfectly adequate for roof sheathing, wall sheathing, and subfloors in dry climates. Choose plywood where moisture exposure is likely — crawl spaces, bathrooms, areas prone to flooding — or where screw-holding strength matters for repeated fastening.
Related Calculators
Frequently Asked Questions
Is OSB as strong as plywood?+
Yes — when span-rated for the same application, OSB and plywood perform equivalently under load. Both are tested to the same APA standards. OSB is slightly stiffer across the panel; plywood has more uniform strength in both directions.
Can OSB get wet during construction?+
Brief exposure is fine. Problems arise with prolonged wetting — days or weeks without drying. Edge swelling can lift shingles or create high spots in subfloors. Cover with tarps at the end of each day if rain is forecast.
Which is better for roof sheathing?+
Either works. OSB is the dominant choice today simply due to cost. Use plywood if you're in a coastal climate, have a low-slope roof, or the sheathing will be exposed before roofing is installed for more than a few days.
Does OSB hold screws as well as plywood?+
OSB holds screws well in initial installation. For applications requiring repeated fastening and removal — like cabinet installation or subfloor repairs — plywood holds up better to multiple screw cycles.