Weber Saint-Gobain - Official website of the company

Tiling of balconies and terraces




Technical constraints

Balconies should be designed with a certain slope to allow drainage.

Water should not be allowed to stagnate.

The structure must be strong enough to support the expected load including tiles, adhesive, grouts and a screed if needed without undue movement.

In exterior applications such as balconies and terraces the thermal and mechanical stresses are much higher than in interior applications.



Climate constraints

External floors are subject to climatic conditions like rain water.

Check the slopes of the substrate to be minimum 1.5 cm over 1m, in order to ensure the drainage of rainwater towards external sides of the terrace.

Extreme temperature variations can also lead to strong mechanical constraints (freezing, tiles expansion due to thermal variations).

Achieve a draining mortar that will facilitate the evacuation of water.

It will help the tile adhesive to dry and avoid carbonation that could lead to white traces on the grout.

Constant water saturation under the tiles will lead to debonding of tiles.

This situation will be increased in case no slope has been included in the design.

Use a high performance and water-resistant tile adhesive, as well as a high performance tile grout which will absorb the dimensional variations of the tiles.




The substrate must be sound, clean and able to bear weight, free from dust, dirt, grease oil or any contaminating material before tiling to prevent adhesion failure.




Tiling on terraces over a sand bed

Apply 2 layers of weberdry 210 AFC or weberdry gum, an acrylic waterproof membrane, between the substrate and the sand bed. After 24 hours minimum, fix the tiles with webercol floor, a thick adhesive mortar applied above the sand bed.

Other application method or concrete substrate

Tile adhesive

weber.col plus and weber.col flex are particularly adapted to this kind of application. In case of large white tiles or stones, weber.col fast or weber.col F1 can be used.

The back-buttering method is mandatory (adhesive applied on the substrate and on the back of the tile) to ensure full adhesion between the tiles and the substrate, and to avoid voids in the adhesive layer. Apply the tiles and press them firmly, ensuring a good adhesion between the tiles and the substrate.


Tile grouting

It is recommended to have a minimum joint width of 2 mm around the tiles.

Grouting should be done at least after 24 hours of fixing tiles. (after 3 hours only when using weber.col fast or weber.col F1) we recommended weber.joint perfect, the low water-absorption grout with Hydro Repell® and Mould Stop® technologies, should be used.



Important note

The existing design of a balcony should be of a rigid concrete construction, with a slope of 1.5 mm/m towards drainage point.





Solution with the following weber products


webercol floor

Thick adhesive mortar

webercol flex

Two components high performance cementitious flexible tile adhesive (latex modified)

webercol F1

Fast-setting high performance tile adhesive with low dust technology

webercol fast

Fast-setting high performance tile adhesive with low dust technology


weberjoint perfect

High performance, Low Stain, cementitious tile grout with Hydro Repell and Mould Stop technologies