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Quick Answers

Is 1 inch plywood actually 1 inch thick?
Not always. "1 inch" is often a nominal label. Softwood fir sold in that family can measure closer to 23/32 inch, while Baltic birch sold as 1 inch is a true 24 mm (about 0.945 inch). If you need a measured inch, ask for 25 mm and check the actual caliper reading.
Does Home Depot or Lowe's sell 1 inch plywood?
Big-box retailers stock thick panels in the one-inch family, usually fir sanded grades and project panels, though availability varies by store and region. True 24 mm Baltic birch is more often found at specialty hardwood and plywood dealers.
How much does a 1 inch plywood sheet weigh?
A 4x8 fir sheet at this thickness weighs roughly 70 to 80 pounds. Baltic birch is denser and can exceed 90 pounds for the same sheet, because the multi-ply birch core packs more wood into the same volume. Plan two-person handling.
Is 1 inch plywood waterproof?
No plywood is fully waterproof. Marine and phenolic-bonded panels are water-resistant and hold up in damp conditions, but unsealed cut edges still absorb moisture. Seal any exposed edge and match the adhesive grade to the environment.
Is 1 inch plywood strong enough for shelving?
Yes, it is a common choice for heavy shelving. As a rough planning figure a one-inch panel carries on the order of 100 pounds per square foot under uniform load on standard support spacing, though a concentrated point load fails it well below that. Keep the face grain running across the supports for maximum stiffness.