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Related Reading

Concrete form plywood types and selectionLink from grade selection section — parent pillar article covering all formwork plywood types
Concrete form release agent guideLink from panel layout section — companion article on release agent application
Formwork plywood storage and maintenanceLink from maintenance section — dedicated guide on post-stripping care and storage
Film faced plywood buying guideLink from CTA section — procurement guidance for panel selection

Quick Answers

What thickness of plywood is used for slab formwork?
18 mm film faced plywood is the most common thickness for slab formwork because it balances stiffness and weight. For heavier pours or wider joist spacing, 21 mm is sometimes specified, while lighter decks can use 15 mm panels supported on closer centres.
How is plywood arranged on a slab formwork deck?
Panels are typically laid with their long edges running across the secondary joists so that sheet joints fall on supports. Staggering panel ends across rows improves stiffness and reduces visible grid marks on the finished concrete soffit.
How many times can slab formwork plywood be reused?
Reuse depends on panel grade, handling, and maintenance. Economy film faced panels typically deliver up to 10 pours, mid-grade phenolic panels up to 20, and premium HDO panels up to 50. Cleaning after each pour and avoiding nail damage are the biggest factors in extending service life.
Should slab formwork plywood be treated with a release agent?
Yes. A thin, even application of form release agent on the panel face before each pour reduces bonding, protects the overlay, and leads to a cleaner concrete surface on stripping. Apply according to the release agent manufacturer's recommendations.