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Joint Fillers Suppliers, UAE

Joint Fillers are compressible materials and poured compounds used to fill construction joints, expansion joints, isolation joints, and control joints in concrete slabs, pavements, and building elements across the GCC. They accommodate movement, prevent debris ingress, and maintain joint functionality over the structure's service life. Products include preformed foam strips, bituminous filler boards, and pourable polyurethane or polysulphide joint sealant systems.

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Joint fillers serve as compressible backup or fill material within construction joints, allowing the joint to open and close with thermal movement, shrinkage, and structural loading. Product types include polyethylene foam backer rod (closed-cell round rod inserted into joints before sealant application to control sealant depth and profile), preformed expansion joint filler boards (fibreboard, polyethylene foam, or bitumen-impregnated fibreboard placed in concrete expansion joints before casting), pourable joint fillers (hot-poured rubberised bitumen or cold-poured polyurethane for pavement and warehouse floor joints), and preformed sealant strips (hydrophilic or compression-type for water-stopping at construction joints).

In the UAE and Saudi Arabia, joint fillers are used in concrete floor slab control joints and construction joints, road and pavement expansion joints, building expansion joints, isolation joints around columns and walls in ground slabs, and pre-cast panel joints. Key specifications include filler type matched to the joint function (expansion, contraction, construction, or isolation), compressibility (minimum 50 percent for expansion joint boards), recovery rate, temperature stability, and compatibility with the sealant applied over the filler. For pourable floor joint fillers, Shore A hardness, abrasion resistance, and self-levelling properties are critical.

Major joint filler product suppliers in the GCC include Sika, BASF, Fosroc, Tremco, and W.R. Meadows. Backer rod is available from numerous manufacturers including Ethafoam and regional foam producers. Procurement managers should coordinate joint filler specification with the structural engineer's joint layout and the sealant specification — the filler and sealant must be compatible and correctly sized for the joint width and depth. For warehouse floor joints subject to forklift traffic, semi-rigid polyurea or epoxy joint fillers provide armoured-edge protection that prevents joint spalling — a common and costly maintenance issue in GCC logistics facilities.

Frequently Asked Questions — Joint Fillers

What is backer rod and why is it used in construction joints?
Backer rod is a compressible closed-cell polyethylene foam rod inserted into a joint before sealant application. It controls the sealant depth (creating the correct width-to-depth ratio for optimal sealant performance — typically 2:1), prevents three-sided adhesion (which restricts sealant movement), and provides a non-bonding surface for the sealant to move against. Correct backer rod sizing (25 to 50 percent larger than the joint width for compression fit) is essential for sealant joint performance.
What joint filler should I use for warehouse floor joints with forklift traffic?
For warehouse floor joints subjected to hard-wheeled forklift traffic, semi-rigid polyurea or epoxy joint fillers with Shore A hardness of 80 to 95 provide the best combination of load support and flexibility. These armoured-edge joint fillers prevent the spalling and chipping of joint edges that occurs when softer sealants cannot support wheel loads. The joint must be clean, dry, and properly primed before filler application.
What expansion joint filler board thickness is standard for concrete slabs?
Expansion joint filler boards in concrete slabs are typically 10 to 25mm thick, matching the required joint width specified by the structural engineer. Standard materials include self-expanding polyethylene foam boards (which recover after compression) and bitumen-impregnated fibreboard. The board must extend the full depth of the slab and be held in position during concrete placement to maintain alignment.