CDX Plywood vs OSB wood grain comparison
building_materials

CDX Plywood vs OSB: Which Sheathing Should You Use? (2026)

Prepared by Lumberama's Wood Comparison Team
|Last updated June 1, 2026|Sources & methodology

CDX plywood and OSB are both used for structural sheathing, but they handle moisture differently. CDX is an exposure-rated plywood; OSB uses oriented strand technology.

CDX Plywood wood grain texture

CDX Plywood

vs
OSB wood grain texture

OSB

Key Takeaways

  • CDX plywood and OSB are both used for structural sheathing, but they handle moisture differently.
  • CDX is an exposure-rated plywood; OSB uses oriented strand technology.
  • CDX handles moisture better making it ideal for roofs and subfloors.
  • OSB is the budget choice for walls in dry conditions.
  • Choose CDX for roof sheathing and subfloors where moisture cycling is expected.
PropertyCDX PlywoodOSB
Cost/4x8 Sheet$25-$45$15-$30
Moisture HandlingAbsorbs/releases evenlyEdge swelling risk
StrengthExcellentExcellent

CDX Plywood

Pros

  • Handles moisture cycles better, Doesn't swell at edges, Lighter weight, Easier to work with

Cons

  • More expensive, Can have voids, Less consistent density, Fewer large sizes available

OSB

Pros

  • 20-40% cheaper, Consistent quality no voids, Excellent shear strength, Wider panel sizes available

Cons

  • Edges swell permanently when wet, Slower to dry out, Heavier, Can delaminate over time

Best Use Cases

Choose CDX for roof sheathing and subfloors where moisture cycling is expected. Choose OSB for wall sheathing and budget-sensitive dry-climate builds.

Verdict

CDX handles moisture better making it ideal for roofs and subfloors. OSB is the budget choice for walls in dry conditions.

Frequently Asked Questions

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