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Quick Answers

What thickness plywood is used for wall sheathing?
For US residential wall framing on 16" o.c. studs, 15/32" CDX plywood is the practical default and meets IRC code minimums. For 24" o.c. studs, 19/32" is typical. Shear walls and braced wall panels often step up to 19/32" or 23/32". Hurricane wind zones typically require structural plywood at 19/32" or 23/32" minimum.
What is the difference between plywood and OSB for wall sheathing?
OSB is roughly 10–20% cheaper than equivalent CDX plywood at the same thickness. Plywood absorbs moisture and recovers when it dries; OSB swells more and does not recover — the swollen edge is permanent. Plywood holds fasteners better under cyclical loads. For coastal climates and custom builds, plywood is the moisture-tolerant upgrade.
What is CDX plywood?
CDX is the standard wall sheathing grade across most of the US. C-grade face, D-grade back, X = exterior glue (Exposure 1 bond — waterproof glue, rated for moisture during construction). The face appearance is irrelevant for wall sheathing because the panel will be covered by WRB and siding.
Can I use plywood for shear walls?
Yes — plywood is the standard material for residential and light commercial shear walls. Structural I plywood (Group-1 species, tighter veneer grading) is typical for engineered shear walls. Verify the specific thickness, nailing schedule, and panel grade against the engineered shear-wall design and local code amendments.
How long can plywood sheathing be exposed to weather?
Plywood sheathing typically carries a 30-day weather exposure rating from the manufacturer. Apply the WRB and finish cladding within that window to prevent edge swelling and panel degradation. Where extended exposure is unavoidable, specify a permanent-EXTERIOR rated panel for additional moisture tolerance.
Is 1/2 inch plywood OK for wall sheathing?
15/32" plywood (the actual thickness of '1/2 inch' sheathing) is the practical default for wall sheathing on 16" o.c. studs and meets IRC code minimums for most applications. For wider stud spacing, shear walls, or hurricane wind zones, step up to 19/32" or 23/32" per the project specification.
What is the price of plywood sheathing in 2026?
Indicative US retail pricing in 2026: 15/32" CDX sheathing at ~$30–$45 per 4×8 sheet, 19/32" CDX at ~$40–$55, and 23/32" structural sheathing at ~$50–$70. Pricing is commodity-driven and fluctuates with the lumber market.
Do hurricane zones require structural plywood?
Most US hurricane wind zones — including Florida HVHZ, parts of coastal Carolinas, Texas Gulf Coast, and Louisiana hurricane wind regions — require structural plywood (PS 1 or PS 2 rated) at 19/32" or 23/32" with ring-shank fasteners and tighter nail spacing. Verify the specific code amendments with the local building official.