Laying of non-calibrated, deformation- and discolouration-sensitive natural stones

Safe laying of natural stones with thickness tolerances that are sensitive to deformation and discolouration puts high demands on the laying materials. When selecting the right adhesive mortar, the material to be laid must be taken into account on the one hand, and the evenness of the substrate on the other one. Since the quick-setting all-bed natural stone mortar weber.xerm 866 F can provide an installation bed in thicknesses of up to 30 mm, safe and economical installation is also possible for such applications.

Laying natural stone

Simple & safe to the goal

Substrate preparation

Apply the primer weber.prim 801 on absorbent substrates or the primer weber.prim 803 on non-absorbent substrates. The quick-drying multi-use primer weber.prim 804 can also be used for pre-treatment of all substrates.
Application

1. Apply a contact coat of weber.xerm 866 F on the substrate with a smoothing trowel and comb down a uniform adhesive bed with a notched trowel at an angle of 45° - 60°.
2. In the case of non-calibrated natural stone slabs and all-natural stone materials that may tend to discolour, first apply a scratch layer of weber.xerm 866 F on their backside.
3. Place large-size slabs onto the mortar bed with installation aids and if necessary, put in the right height with a rubber mallet.
Grouting

1. After hardening the tile adhesive, use either the flexible grout weber.fug 877 or the ceramic and natural stone grout with crystal effect weber.fug 875 F.
2. Connection and movement joints must be closed with the elastic silicone joint sealant weber.fug 880 or weber.fug 881. In the case of natural stones, use the specific sealant weber.fug 883. For better bonding, use the primer weber.fug 884 (absorbent joint sides) or weber.fug 885 (non-absorbent joint sides).