Checking used formwork panels: frames, facings and a whole lot

A framed formwork panel has two service lives. The frame, made of steel or aluminium, can last for many years. The facing, usually film-faced plywood, wears out far sooner and is replaced several times over the life of the frame. Inspecting used panels therefore means judging frame and facing separately. A sound frame with a tired facing can be refaced; a bent frame with a fresh facing is still a bent frame. The checklist below applies to panels from any system, whether you inspect a lot in a yard or on delivery at your own site.

Frame: straight, square and free of cracks

Lay the panel face down on a level surface or stand it against a reliable straight edge, then work through these points:

• Straightness: hold a straight edge or a taut string along each long side. A bow shows as a gap in the middle.
• Squareness: measure both diagonals. They should match within the tolerance the manufacturer allows.
• Twist: a twisted panel rocks on a flat floor when you press down on opposite corners.
• Cross members: no buckled ribs, no missing or cut sections.
• Welds: no cracks, particularly at the corners, around tie points and at crane lifting points. A thin rust line following a weld often hides a crack.
• Earlier repairs: neat, professional repair welds can be acceptable; rough build-ups on load-bearing details are not.
• Corrosion: light surface rust is cosmetic, but pitting that eats into the wall thickness is a reason to reject. On aluminium frames, look for cracks, deep gouges and crushed sections instead.

Edge profiles and connection points

The edge profile is where two panels meet and where the clamps grip. Damage here has two consequences: the joint opens and cement paste runs out, and the clamp no longer seats properly. Run a hand and a straight edge along every edge. Minor dents can sometimes be straightened in a workshop, but a deformed clamping zone cannot be put right on site. Also check that holes and slots for accessories are not elongated or torn, and that built-in nuts, bushes and lifting points are complete and undamaged.

Tie holes and plugs

Depending on the system, ties pass through holes in the facing or through recesses in the frame. Any hole not used in a given pour must be closed with a plug, otherwise concrete escapes and leaves a blemish. Look for missing plugs, holes that have been widened or burnt out, and extra holes drilled for one-off fixings. Every unplanned hole needs a plug or a patch, and a facing covered in patches is close to the end of its life.

Facing: plywood, plastic and surface quality

Most panels carry phenolic film-faced plywood; some use plastic or composite sheets. Check for:

• Delamination: plies coming apart at the edges or bubbles in the surface. Tap with a knuckle; a hollow sound points to a void.
• Swelling: water has entered through cut edges, screw holes or damaged film. Swollen areas stand proud and print onto the concrete.
• Film wear: dull, rough or fibrous patches where the coating has gone. The concrete will look blotchy there.
• Mechanical damage: nail holes, deep scratches, vibrator marks and previous patches.
• Fixings: screws or rivets flush with the surface and tight.

How many pours a facing survives depends on its grade, on cleaning, on the release agent, on contact with the poker vibrator and on storage. A stated number of uses therefore says little. What counts is the surface in front of you.

For fair-faced or architectural concrete, the project specification defines the required surface class. National classification schemes differ, but they all assess evenness, pores, colour consistency and the pattern of joints and tie holes. Patches, scratches and worn film on a used facing will show in that finish. For such work, refurbished panels with new facings or new panels are the safer choice. Used panels remain perfectly suitable for foundations, basements and walls that will be rendered, clad or hidden.

Cleaning, release agent and storage

Hardened residue must come off the facing and the edge profiles before the next pour. Use scrapers and cleaning equipment suited to the facing material; hammers, chisels and steel brushes destroy the film. Take extra care with the edges, because residue there stops joints from closing. Apply release agent thinly and evenly shortly before use: too much causes stains, too little lets the concrete stick. Store panels on bearers, off the ground and covered, with the faces protected from knocks.

For a buyer, the cleaning state reveals how the previous owner looked after the material. Thick crusts on faces and edges usually go together with other wear.

Used or refurbished: sorting and documenting a lot

Used panels come as they left their last site: cleaned, with visible signs of use. Refurbished panels have been inspected, straightened where possible, recoated and given new facings, so their concrete finish comes close to new material. Both have their place, and you will find them under used formwork parts and refurbished formwork parts.

Whether you buy, sell or review your own fleet, the same routine helps:

1. Sort by system first, then by height and width.
2. Grade every panel, for example A for visible concrete, B for standard work, C for a sound frame that needs a new facing, and scrap.
3. Mark rejected panels clearly so nobody uses them by mistake.
4. Count accessories separately and match them to the panel quantities.
5. Photograph typical panels of each grade from front and back, plus a close-up of the worst facing.
6. Record system, size, quantity and grade in one list.

This routine reflects our own quality check of used material, and a list in this format makes offers easier to compare. For the wider buying process, read buying used formwork; current lots are shown under panels.

Quick reference: accept or reject