Force-fit sealing of cracks in screeds and concrete substrates

Excessive shrinkage during drying and curing, overstressing or impeded temperature expansion of screed or concrete substrates often leads to cracks. In order to restore the load-bearing capacity of such cracked substrates, the cracks must be sealed in a force-fit manner. Here, only products especially suited for this purpose should be used. The 2-comp. quick-curing epoxy resin weber.prim 806 offers the necessary safety for sealing cracks due to its high compressive, flexural and bonding strengths.

Simple & safe to the goal

  1. Substrate preparation

    1. Opening the crack and cutting channels for transverse fixation.

  2. 2. After thorough removal of dust and other adhesion-impairing components, crack-fixing clips are inserted into the transversal channels.

  3. Application

    1. The cracks and channels must be filled flush with weber.prim 806.

  4. 2. If necessary, fill cavities with filled (with silica sand) or thickened (with thixopropic agent) epoxy resin. Scatter dry quartz sand (approx. 0.3 - 0.8 mm) in excess over the still tacky resin layer for bonding purpose.

  5. 3. After complete curing, the loose excess sand must be removed completely. If necessary, the screed or concrete surfaces can be levelled, e.g. with the floor self-levelling compound weber.plan 813-25 (1 - 25 mm).

  6. 4. Then a fixing of ceramic coverings can be carried out, e.g. with the multi-use flexible tile adhesive weber.xerm 861.