“Plywood for Slab Formwork: Thickness, Grade & Layout Guide” no está disponible en Español todavía

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.

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.

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.

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.