CERAfix 325 STRONG waterproofing and uncoupling membrane

CERAfix 325 Strong involves a special construction method. We therefore recommend obtaining a contractual and written agreement to use it.

Before applying CERAfix 325 Strong, spread a contact layer with CERAfix 300/301 on existing load-bearing tile substrates and allow to harden!

CERAfix 325 Strong is not suitable for high dynamic loads such as industrial traffic!

CERAfix 300/301/SMP Sprint can be used to seal suitable edge and gutter elements. In this case, the substrate must be prepared in a suitable manner, e.g.: Direct contact with metals such as copper, zinc and aluminium must be prevented by means of pore-tight priming with CERAfix 103/203 and TEGAfix quartz sand. Pore-tight priming is produced in two stages with CERAfix 203 or CERAfix 103. The first stage involves liberal application to the substrate cleaned with acetone (check compatibility) and careful coating. Once this layer has reacted sufficiently so that it can no longer be disturbed (about 3-6 hours*), another epoxy resin layer is applied and scattered with TEGAfix 430 quartz sand. Consumption approx. 800 g/m². A connection to the surface seal is then formed over the cured blinding layer, e.g. using CERAfix 316 sealing tape with CERAfix 300/301/SMP Sprint.

To uncouple wooden substrates, we recommend using CERAfix 206 uncoupling panels.

Edge, field, building and movement joints must be retained or incorporated at the specified locations and sealed by suitable means, e.g. edge insulation strips! Dummy joints must be friction-locked or secured against height offset and formed as a movement joint in the surface covering.

CERAfix 325 must not be adhered or worked over with solvent-containing products!

On cool, damp substrates and in rooms with high humidity and/or low temperatures, an extended drying time should be anticipated for the structure. In such cases, the product will take longer to reach a load-bearing state, including resistance to water.

Protect the CERAfix 325 construction from the effects of water and freezing in the installed state until it has completely dried; this will take longer in unfavourable weather conditions compared to normal conditions*.

The relevant applicable technical information sheets of the indicated products must be observed!

Currently applicable regulations must be observed! For example:

• DIN 18157


• DIN 18352


• DIN 18560


• DIN EN 13813


• DIN 18202


• DIN 1055

BEB information sheets, published by Bundesverband

Estrich und Belag e. V. (Federal Association for Screeds and Coverings) "Interface coordination for heated floor constructions"

ZDB information sheets, published by the German Tiling Industry Association:

• [*1] "Compound sealing"


• [*2] "Coverings on calcium sulphate screed"


• [*3] "Movement joints in tile and slab facings and coverings"


• [*5] "Ceramic tiles and slabs, natural dimension stone and artificial dimension stone on cement-bound floor structures with insulation layers"


• [*6] "Ceramic tiles and slabs, natural dimension stone and artificial dimension stone on heated cement-bound floor structures"


• [*7] "Outer coverings"