Repair cracks in the screed with casting resin

Casting resin is ideal for repairing damaged screed. It is important to accommodate the expansion behavior of screed. So-called shaft connectors absorb stresses and give the screed sufficient elasticity. Ideally, a repair kit with the appropriate tools will be used.

Secure elasticity

Basically cast resin has all the properties to repair a screed durable and durable. During processing, however, in contrast to conventional filling, the elasticity must be retained. The traffic loads caused by walking and setting up furniture lead to the formation of tensile and compressive forces.

Cured resin is inelastic and would form rigid channels upon simple pouring. They can lead to later breakage of the screed elsewhere. This risk can be eliminated by shaft connectors. The joints applied across the cracks serve as strain tolerance transmitters.

Put on shaft connector

Shaft connectors are transverse joints which are milled into the screed at intervals of about twenty centimeters along the cracks. They should have a side length of three centimeters in both directions. Repair kits include special screed braces, which are inserted into the cross-shaped joints before the casting resin is poured.

It is important to locate the structurally applied expansion joints, which must remain open. In case of damage, they should only be treated with elastic fillers, but in most cases not at all. If in doubt, a specialist should be asked which expansion joints must be maintained.

Thoroughly clean

In order for the casting resin to have optimum conditions for spreading and sticking, the cracks, holes and milled joints must be freed from loose dirt and dusted as much as possible. It is recommended to scratch out the cracks and holes with a narrow, soft wire brush, a chisel, a steel plunge or a milling cutter.

After cleaning the cracks and holes and milling out the shaft connectors, all cavities should be vacuumed with a powerful vacuum cleaner. Subsequently, the casting resin is processed according to the manufacturer's instructions. For large defects, extensions of the resin can be achieved by the addition of quartz sand.

Tips & Tricks

You can also fill holes and damage in the concrete under the screed with cast resin. Ideally, to ensure lasting stability, ideally perform both operations separated by a minimum of 48 hours.

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