Ask any experienced UK house-builder why their first-fix subfloors stay dry through a wet winter and they will usually point to one product. Caberdek flooring is a P5 structural chipboard with a factory-bonded peelable plastic film that shrugs off rain, paint drips, and trades-boot muck until the house is watertight. It is not a finished floor, but getting the subfloor right dictates everything that follows, so this guide is worth reading before you order a single pack.
What Caberdek Actually Is
Manufactured by West Fraser (formerly Norbord) in Inverness, Scotland, Caberdek is a tongue-and-groove P5 moisture-resistant chipboard sized at 2400mm by 600mm by either 18mm or 22mm. The top face carries a translucent polyethylene film that protects the board during the build. Once you are ready for the final floor covering, you peel the film off in strips and expose a clean, unblemished surface.
P5 is the European grade for moisture-resistant structural chipboard. It is not waterproof, but it tolerates short-term wetting without delaminating the way cheaper P4 or OSB3 does.
Sizing and Joist Spacing
- 18mm Caberdek: Suitable for joists at 16-inch (400mm) centers. Standard in most modern UK residential builds.
- 22mm Caberdek: Required for 24-inch (600mm) joist centers, common in some timber-frame and modular systems.
- Coverage per board: 1.44 sq meters, or roughly 15.5 sq ft.
- Weight: 26.5 kg for 18mm boards and 32 kg for 22mm, heavy enough that two people should carry each sheet.
Pros of Caberdek Flooring
The peel-off film is the obvious headline. On a typical new-build, the subfloor is laid early, then plasterers, electricians, and plumbers trample it for weeks. Without protection you get stains, dents, and swollen edges where rain has blown in through window openings. With Caberdek, you peel the film a week before final floor covering goes down and reveal a surface that still meets the tolerances needed for LVP, engineered wood, or tile.
The tongue-and-groove profile is also precision-machined. Boards knock together with a rubber mallet and the seams close tight, which reduces squeaks later. PVA D4 adhesive in the joints is standard practice and pushes the joint performance up to genuine structural grade.
Cons and Limitations
Caberdek is more expensive than basic P5 chipboard. Expect $1.30 to $1.70 per sq ft for the 18mm board delivered in the UK, compared to $0.85 to $1.10 for unfilmed equivalents. On a 2,000 sq ft first floor, that is roughly $900 more.
The film also punishes carelessness. Once the boards are down and the film is scored by a dropped screw or utility knife, water can wick under the plastic and soak into the chipboard below. A protected but compromised sheet rots faster than a plain board that can dry out in the air.
Installation Best Practice
- Store pallets flat, off the ground, and under cover before use. A damp board will not lie flat.
- Offset end joints by at least one joist bay to avoid a continuous weak line.
- Glue all tongue-and-groove edges with a D4 PVA and screw down at 250mm centers along the joists.
- Leave a 10mm expansion gap at every wall and around penetrations like soil pipes.
- Walk the floor before peeling the film and replace any boards with visible cuts, tears, or water staining.
Compared to Standard P5 Chipboard
A plain P5 board is genuinely fine if the house is under a watertight roof before the floor goes down. On that kind of tightly sequenced build, paying for Caberdek is an unnecessary expense.
On any project where the floor will sit exposed for more than 48 hours before the roof is on, or where other trades will be walking and working on the deck for weeks, the premium for filmed board pays for itself. One ruined floor costing $3,000 to replace wipes out the savings from 30 jobs worth of cheaper chipboard.
Alternative Products
Kronospan Sterling OSB/3 with a separate temporary protection membrane is the main alternative and runs about 15% cheaper per sq ft, but you need to buy and tape down the protection board yourself. Egger Protect is a direct competitor with similar filmed technology and often matches Caberdek on price at the merchant counter. Both work, though Caberdek has the longer UK track record.
Where to Buy
Jewson, Travis Perkins, Howdens, and Selco all carry Caberdek in major UK cities. For US customers, direct equivalents are harder to find, but Weyerhaeuser Edge Gold with a separate SubSealer membrane gets you comparable performance at similar cost.
Final Verdict
Caberdek flooring is a specialist subfloor product that earns its place on any build where the deck will be exposed for weeks rather than hours. The peelable film is not a gimmick — it meaningfully cuts rework, warranty claims, and finish-floor failures. For quick refurbishments where the roof is already on, cheaper P5 board is fine. For new builds and extensions, Caberdek is the sensible specification.
Prefer to explore on your own?
See how new flooring looks in your actual room in seconds — free, no signup.
Try the free Floor Studio →
