Overview

The Foamjoint adhesive back expansion joint is a closed cell polyethylene foam strip used as a compressible filler in concrete and masonry movement joints. It is 75mm deep and 10mm thick, supplied on a 25m roll, with a self adhesive backing that sticks straight to a slab edge or wall without extra fasteners.

Because the foam is closed cell, it will not absorb moisture, rot or break down in the concrete. It compresses under light load and rebounds to its original shape, so the concrete can expand and contract while the joint stays sealed. A 10mm tear off strip at the face leaves a clean recess for sealant once the concrete has cured.

Key Features

• 75mm deep x 10mm thick closed cell polyethylene foam
• 25m roll length for continuous runs
• Self adhesive backing for peel and stick installation
• 10mm tear off zip strip provides a clean sealant recess
• Compresses under load and rebounds to accommodate movement
• Water resistant and resistant to rot and site chemicals

Specifications

• Joint depth: 75mm
• Foam thickness: 10mm
• Roll length: 25m
• Material: closed cell polyethylene foam
• Adhesive backing: yes, with a 10mm tear off strip
• Colour: white

Applications

• Expansion joints in concrete slabs, paths and driveways
• Foam filler between slabs and walls
• Compression backing in kerb, step edge and precast work
• Debonded compressible joints before sealant application
• Control joints in floors and general slab construction

What You Need to Complete the Job

Fit the foam joint before the pour, then strike the concrete off level with it. Once the slab has cured, trim the tear off strip and tool a gauging trowel over the joint as you finish. Browse the Concreting Tools range for the rest of the finishing kit and keep a Dunlop gauging trowel handy for cleaning the joint face.

Frequently Asked Questions

What is Foamjoint used for?

Foamjoint is a compressible filler for concrete and masonry movement joints. It sits in the joint before the concrete is poured, compresses when the concrete expands and rebounds when it contracts, and the tear off strip leaves a clean recess to fill with sealant after the pour. It keeps the joint working as a joint instead of cracking.

How does the adhesive backing work?

The foam has a self adhesive strip on the back that sticks directly to the slab edge or wall, so no fasteners or glue are needed. Peel off the liner, press the strip into place and it holds while the concrete is placed against it. The 10mm tear off strip at the front is removed after the concrete cures.

What size is this roll?

The foam is 75mm deep and 10mm thick on a 25m roll. That depth suits standard slab and kerb joint depths, and the 25m roll covers a long continuous run without joins. If you need a different depth or thickness, check the other Foamjoint listings in the range.