Choosing Film Faced Plywood for Concrete Formwork

Cost per pour is the only number that matters

A panel that costs thirty per cent less and gives half the pours is more expensive. Before comparing prices, decide how many pours the project needs from each panel, because that determines which of the four specification decisions below you can afford to economise on.

Glue: MR or WBP

MR is moisture resistant, intended for dry interior use with occasional damp. WBP is weather and boil proof, a phenolic bond designed for repeated wet cycles. Formwork is a repeated wet cycle by definition. MR film faced panels exist and are cheaper, and they are appropriate only for very low reuse counts.

Core species

Poplar, combi, hardwood and birch are the four options. Poplar is the lightest and cheapest and gives the fewest reuses. Birch and hardwood are heavier, stiffer and last longer. Combi sits between them. On sites where panels are handled by hand, weight is a labour cost that should be counted alongside panel life.

Grade A and AA

The grade describes the face and construction quality. AA is the higher grade. On a visible concrete finish — exposed columns, architectural walls — grade drives the result. On foundations and hidden work it matters far less.

Face colour

Black and brown films are offered against the same core, glue, grade and thickness options. The choice is usually a project specification rather than a performance difference, so confirm what the specification actually requires before paying a premium for one.

Thickness against span

9, 12, 18 and 21 mm are available. Thickness is chosen against the support spacing and the concrete pressure, not by habit. A thicker panel on close supports is money spent on stiffness that the formwork system does not need.

What ruins good panels

Almost all early formwork panel failure starts at a cut edge. Sealing every site-cut edge with edge paint on the day it is cut is the cheapest intervention available and the one most often skipped. After that: release agent on every pour, cleaning before the concrete fully cures, and flat stacking face to face between uses.