Repair cracks in the screed with cast resin

Cast resin is ideal for repairing damaged screed. Important is to meet the strain behavior of screed. So-called wave connectors absorb tensions and give sufficient elasticity to the screed. Ideally, a repair kit is used with the corresponding tools.

Secure elasticity

Basically, cast resin has all the properties needed to repair a screed in a permanent and durable manner. However, in contrast to conventional filling, the elasticity must be retained during processing. The traffic loads caused by walking on and setting up furniture create tensile and compressive forces.

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Hardened casting resin is inelastic and would form rigid channels if simply poured in. They can lead to later breakage of the screed in other places. This risk can be eliminated by using shaft connectors. The joints laid across the course of the cracks serve as expansion tolerance generators.

Create shaft connector

Wave connectors are transverse joints that are milled into the screed at intervals of around twenty centimeters along the course of the cracks. You should have a leg length of three centimeters in about both directions. The repair kits contain special screed clips that are inserted into the cross-shaped joints before the casting resin is poured in.

It is important to locate the structural expansion joints that have to remain open. Even if they are damaged, they should only be processed with elastic fillers, but in most cases not at all. If in doubt, ask a specialist which expansion joints must be retained.

Clean thoroughly

So that the casting resin finds optimal conditions for spreading and adhering, the cracks, holes and milled joints must be freed from loose dirt and dusted as best as possible. Scraping out the cracks and holes with a narrow, soft wire brush, chisel, chisel or milling cutter is recommended.

After cleaning the cracks and holes and milling out the shaft connectors, all cavities should be vacuumed with a powerful vacuum cleaner. The casting resin is then processed according to the manufacturer's instructions. In the case of large damaged areas, the resin can be lengthened by adding quartz sand.

Tips & Tricks You can also fill holes and damage in the concrete under the screed with casting resin. To ensure long-term stability, ideally carry out both tasks separately from each other with a time interval of at least 48 hours.