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BASE PLATE WATERPROOFING – against negative water pressure with load on top
Cresit offers complete systems for every kind of waterproofing.
Chosen product and application method should depend on construction’s type, water load and requirements of the country.
Before application of the waterproofing materials check if the substrate is dry, even, compact, stable, free of dust and laitance.
Get rid of any substances which decrease adhesion, for that you can use a steel trowel.Remember to clean away dust properly to prepare the surface for priming.
BT 26 “ALL-WEATHER” PRIMER
Mix BT 26 Primer carefully with water at a ratio of 1:1 parts by volume. Use a brush to apply a generous and uniform coat.
The diluted primer can be used at temperatures above +5 C degree.At temperatures lower than +5 C degree (down to 0 C degree), use BT 26 Primer undiluted. In the case of coarse-pored surfaces, e.g. pumice and hollow blocks as well as aerated concrete. e primer must always be used undiluted. Check if the priming coat is completely dry!
The drying time depends on the climate conditions and type of substrate.
3. JOINTS SEALING
Use previously cutted strips of BT 21 membrane to seal the joints on the floor.
BT 18 SELF-ADHESIVE WATERPROOFING MEMBRANE
BT 21 “ALL-WEATHER” WATERPROOFING MEMBRANE
Properly overlap separate strips during application. Press strips to the substrate with rubber roller for better adhesion.
4.INSTALLATION OF THE MEMBRANE
Membrane elements of adequate shape and size should be previously prepared. Cut the BT 21 to the required length, measure and roll it up. Remove the backing paper and fix the membrane to the floor with an overlapping of 10 cm. Next fix previously prepared elements in the corners. After that membrane should be put according to the installation instruction. It is very important to install a separate protection of inner and outer corners. These areas are especially endanger with water and moisture. The top edge of the membrane should be additionally protected. BT 21 / BT 18 have to be protected against damage by a protective layer, e.g. polystyrene / PU boards.
5.INSULATION BOARDS INSTALLATION
In the first step install the dilatation tape around the walls. Then cut XPS boards to the required shape. nstall the boards on the floor in the brick-like manner.
Protect insulation boards with PU film. Apply film partly on the walls. After that you can proceed with screed or other material application.
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