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How does a solvent-free repair resin system fix non-structural cracks in screeds?

Cracks will sometimes appear in screeds, either by forced drying, settlement or naturally through the hydration process, so this product ensures these cracks don’t continue to open. If they did, they’ll allow moisture to come through, which could be detrimental.

When repairing screeds, we recommend you cut the crack open with a disc cutter to 40% of the thickness of the slab. For example, if you have a 50ml slab of screed then the cut will need to be 20ml deep. You should then introduce 90deg cuts across the crack at 25cm intervals and place stitching pins (small metal serrated pins) into the crosscuts. The pins are serrated so the resin sits around them and resists a lateral movement, preventing it from being pulled apart.

Once the pins are in, apply the resin into the joints. The joints should be topped up so they’re flush with the surface of the crack. Once filled, the product should dry in 15-30 minutes. If you were to put a DPM over the top, it would just need a quick smooth over first and be left until the following day. However, if you’re going to put a smoothing compound directly over the top, we’d smooth it off and scatter kiln-dried sand with a maximum grain size of 0.9mm over it until it’s completely covered and none of the resin is visible. Louise Vanham, category manager – walls & floors

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