Plywood vs OSB Subfloor
**Plywood** layers resist moisture swelling along edges better in many remodels. **OSB** is cheaper and stiff but swells more if wet before flooring goes down.
Step by step
1. Check span rating
Match thickness to joist spacing (16 vs 24 OC).
2. Plan moisture control
OSB needs dry-in faster; avoid standing water.
3. Fastener pattern
Glue + screw reduces squeak for both.
Plywood vs OSB
Code allows both when rated; remodelers often prefer plywood on wet rooms.
- Plywood: Better recovery if edge-wet; higher cost.
- OSB: Lower cost; swell risk if soaked.
Common mistakes
- Installing flooring on swollen OSB
- Wrong thickness for span
FAQ
Can I use OSB in bathrooms?
Possible with proper waterproofing—many pros prefer plywood or foam board systems.