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Quick Answers

What is the actual thickness of 3/8 plywood?
The actual thickness of 3/8 plywood is 11/32 inch (0.344 inches, approximately 8.7 mm). This difference between the nominal 3/8-inch designation and the actual 11/32-inch measurement is standard under APA PS 1 manufacturing tolerances.
Can you use 3/8 plywood for roofing?
Three-eighths-inch plywood is approved for roof sheathing under limited conditions: rafter spacing of 16 inches on center maximum, light roof covering (asphalt shingles), and low snow-load zones. For most residential roofing, 1/2-inch or 5/8-inch plywood is the better choice.
How much weight can 3/8 plywood hold?
Under uniform loading at a 16-inch span, 3/8 CDX plywood supports approximately 30 to 40 pounds per square foot. Point load capacity is significantly lower — heavy concentrated loads can cause localized deflection or punch-through.
Is 3/8 plywood strong enough for shelving?
For light-duty shelving at spans under 24 inches, 3/8 plywood can work. For bookshelves, pantry shelving, or any span exceeding 24 inches, 3/4-inch plywood is the standard recommendation. Hardwood plywood (birch or maple) in 3/8 inch performs somewhat better than softwood CDX.
What is the difference between 3/8 and 11/32 plywood?
They are the same product. Three-eighths inch is the nominal thickness designation used in sales and specifications; 11/32 inch is the actual manufactured thickness under APA standards.
Can 3/8 plywood be used for concrete forms?
No. Three-eighths-inch plywood is too thin for concrete forming. The minimum practical thickness for light-duty concrete forms is 1/2 inch, and the standard specification for wall and foundation forms is 3/4 inch (18 mm).