Levelling and tile fixing on wooden substrates

When renovating old buildings, it is often necessary to prepare existing wood substrates for the subsequent installation of top coverings. In such a case, conventional smoothing compounds quickly reach their limits, as they cannot adequately compensate for the movements caused by the construction. Here, it is important to use a system that offers a high degree of safety when dealing with this problem. By combining, for ex. the floor self-levelling compound weber.plan 813-25 (1 - 25 mm) with the high-strength woven glass fiber mesh weber.sys 835 critical substrates and wooden floors can be safely levelled out.

Renovation

Simple & safe to the goal

Substrate preparation

1. The wooden substrate must be sufficiently screwed to the sub-structure (screw spacing max. 40 cm) in order to increase its load-bearing capacity.
2. Open butt joints must be closed with appropriate measures (for ex. an acrylic joint sealant like weber.fug 888).
3. Wooden substrates are first primed with weber.prim 803. Specific chipboards (resistant to high humidity and with fungicide additive) and untreated wooden planks must be primed with the EP resin primer weber.prim 807 and sprinkled with silica sand.
4. All adjacent building parts (walls, pipe penetrations, pillars, columns etc.) should be separated from the floor construction with an insulation foam strip; so as to prevent sound bridges and stress cracks.
Application

1. Lay the woven glass fiber mesh weber.sys 987 in strips with an overlapping of min. 10 cm.
2. The floor self-levelling compound is poured, starting at the lowest point of the substrate.
3. Finally, the levelling compound is uniformly distributed to the required layer thickness with a flat trowel, a flat rake (such as weber.sys Großflächenrakel) or a spike roller. The use of a spike roller ensures optimum de-aeration to prevent air pockets in the hardened levelling compound.
4. After the levelling compound has dried completely, top coverings can be laid. The surface should first be de-coupled by installing the impact sound insulation and de-coupling system weber.sys 832 in order to accommodate ceramic coverings and natural stones.