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Related Reading

Properties of plywoodThe parent properties guide covers strength, bond class, and dimensional behavior alongside thermal performance.
Density of plywoodDensity drives both thermal conductivity and structural performance, and explains why lighter cores insulate marginally better.
HDO plywoodVinawood's North American HDO formwork range, engineered for structural and forming performance rather than insulation.
Film-faced plywoodThe full film-faced plywood collection for concrete formwork and structural applications.

Quick Answers

Does plywood offer any R-value?
Yes, but a modest one. Plywood has an R-value of roughly 1.0 to 1.25 per inch of thickness. It is real resistance that an energy model counts, but it is a small fraction of what a dedicated insulation layer provides. Plywood is a structural panel that insulates a little, not an insulation product.
What R-value does 3/4 inch plywood have?
About R-0.94. A 3/4-inch (18 mm) sheet at roughly R-1.25 per inch lands just under R-1. That is a useful bonus in a wall or roof build-up, but the cavity insulation or continuous rigid foam still does almost all of the thermal work.
What is the R-value of 1/2 inch plywood?
Around R-0.63. A 1/2-inch (12 mm) sheet contributes roughly two-thirds of a point of R-value. A 5/8-inch sheet sits near R-0.78, and a 1/4-inch sheet near R-0.31 — the relationship is linear with thickness.
What has more R-value, plywood or drywall?
Plywood, marginally. Plywood runs about R-1.0 to 1.25 per inch while gypsum drywall sits near R-0.9 per inch. The difference is small. Both are far below rigid foam, which reaches R-5.6 to 6.5 per inch and is the layer that actually carries an assembly's insulation.