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How to make a private bathroom waterproof

Learn how to install bonded waterproof insulation in private showers & bathrooms.

Crucial to know

Application in 2 coats

CL 51 dry thickness layer  0.5 mm

CL 50 dry thickness layer 2 mm

Tools needed

A brush

A trowel

A drill with a mixer paddle

Sealing tapes

Step 1

Basic info about products

  • Ceresit CL 50 is two-component, cement + polymer dispersion sealing film (more here).
  • Ceresit CL 51 is one-component dispersion based waterproofing film (more here).
  • Ceresit CL 72 is epoxy resin product with high crack-bridging ability and resistance to thermal and mechanical stresses.

Liquid waterproofing products

For bonded waterproofing system you can choose a polymer-mortar sealing film or the epoxy sealing. Both can be used with the sealing tapes and collars. Liquid-applied products for waterproofing purposes and tested in compliance with EN 14891 feature a crack-bridging ability. They produce a stress-compensating bond between screed and tile adhesive.

  • Ceresit CL 50 is two-component, cement + polymer dispersion sealing film (more here).
  • Ceresit CL 51 is one-component dispersion based waterproofing film (more here).
  • Ceresit CL 72 is epoxy resin product with high crack-bridging ability and resistance to thermal and mechanical stresses.

Please not that all waterproofing products above should be applied in two layers (coats). Necessary dry layer thickness for Ceresit CL 50 is 2 mm and for Ceresit CL 51 only 0,5 mm (wet film 1 mm). First layer can be applied with a brush and the second one with a brush or a trowel.

SEALING TAPES FOR JOINTS, CORNERS, PIPE INLETS AND DRAIN OPENINGS

It is recommended to embed waterproofing tapes and collars in all corners, around joints and openings (shower and bathtub drains). For this purpose use Ceresit CL 82 Ultratape, Ceresit CL 152 Sealing Tape and Ceresit CL 83 Sealing Collar.

The sealing tapes and collars should be embedded in the first layer of liquid waterproofing and covered with the second one.

Step 2

Substrate testing & preparation

testing and preparation of the substrate

For these subjects, please find the related articles: Substrate testing, How to prepare floor for tiling, How to prepare wall for tiling, How to apply self-levelling compound, and for priming How to choose the right primer.

Step 3

Application videos

Step 4

Schemes of bathroom waterproofing

Tips & Tricks

For professionals

Ceresit CL 69 membrane as waterproofing alternative

Crack-bridging, 3-layered waterproofing and uncoupling membrane Ceresit CL 69 Ultra-Tight is a trouble-free alternative to liquid-applied waterproofing products for wet rooms. It ensures rapid work progress. Due to its uncoupling effect, CL 69 is suitable for the installation of ceramic tiles and slabs on critical substrates.

products used

  • ${/content/heliux/adhesive/ceresit/com/en/products/tiling/product#/ceresit-cl-152/SAP_0201SMC013Q6/searchResult.productFields.MainImageAltText}
    CERESIT CL 152
    Sealing tape for the waterproof bridging of expansion and connection joints up to 120 mm width, suitable for indoor and outdoor application. 
  • ${/content/heliux/adhesive/ceresit/com/en/products/tiling/product#/ceresit-cl-50/SAP_0201SLC013Q9/searchResult.productFields.MainImageAltText}
    CERESIT CL 50
    Two-component alternative sealing for waterproofing, suitable for wet areas such as bathrooms, balconies, swimming pools, etc. Certified for outdoor use. 
  • ${/content/heliux/adhesive/ceresit/com/en/products/tiling/product#/ceresit-cl-51/SAP_0201SKC013R0/searchResult.productFields.MainImageAltText}
    CERESIT CL 51
    Flexible one-component sealing film for application under tiles and slabs, suitable for domestic wet areas indoors. 
  • ${/content/heliux/adhesive/ceresit/com/en/products/tiling/product#/ceresit-cl-82/SAP_0201SMC013R6/searchResult.productFields.MainImageAltText}
    CERESIT CL 82
    Sealing tape for the waterproof bridging of expansion and connection joints up to 120 mm width, suitable for indoor and outdoor application. 
  • ${/content/heliux/adhesive/ceresit/com/en/products/tiling/product#/ceresit-cl-83/SAP_0201SMC013R7/searchResult.productFields.MainImageAltText}
    CERESIT CL 83
    Wall sealing collar for the reliable sealing of pipe passages of 15 mm, suitable for indoor and outdoor application. 

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