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Quick Answers

What is plyform plywood and how is it graded?
Plyform is a concrete-forming plywood panel manufactured to APA (Engineered Wood Association) standards. It comes in two main grades: Plyform Class I, which uses stronger Group 1 or Group 2 face species for higher reuse cycles, and Plyform Class II, which uses Group 3 or Group 4 veneers and is suitable for lighter-duty pours.
How many times can plyform plywood be reused?
Reuse depends on the grade and jobsite handling. Class I plyform with an HDO overlay can typically achieve 20–50 reuse cycles when properly cleaned and stored. Standard B-B plyform without overlay may last 5–10 pours before the surface degrades noticeably.
What thickness of plyform is best for concrete forming?
The most common thickness is 3/4 inch (19 mm), which provides adequate stiffness for wall and column forms with standard stud spacing. For slab formwork with wider joist spacing, 1-1/8 inch (28 mm) Structural I plyform offers greater span capacity and deflection resistance.
Can plyform plywood be used for architectural concrete finishes?
Standard B-B plyform produces a utilitarian surface with visible grain transfer. For architectural or fair-face concrete, HDO-overlaid plyform or film-faced formwork panels are recommended, as the resin overlay produces a smoother, more uniform concrete surface.