Levelling of wooden floors

In the renovation and refurbishment of old buildings, it is often necessary to prepare existing wooden substrates for the subsequent installation of top floorings. Conventional levelling compounds quickly reach their limits there, as they cannot sufficiently compensate for the design related movements. Here, it is important to use a system that offers a high degree of safety. By combining the quick-setting and -drying floor levelling compound for renovation and timber floors weber.floor 4320 with the high-strength woven mesh weber.floor 4945, critical substrates and timber floors can be levelled in a safe and long-lasting way.

Renovation

Simple & safe to the goal

Check of substrate and preliminary works

1. The wooden substrate must be dry, clean and load-bearing. Adhesion-impairing particles on the surface must be carefully removed.
2. The wooden substrate must be sufficiently screwed to the substructure (with a screw spacing max. 40 cm) in order to increase thee load-bearing capacity.
3. Open butt joints must be closed by appropriate measures, like an acrylic sealant (weber.fug 888) or a combined bonding primer + scratch layer (weber.floor 4705).
4. The creeping of the self-levelling compound in the perimeter joints creates acoustic bridges. Furthermore, the force-fit bonding of different buildings parts can avoid cracks due to tension.
5. For this reason a direct contact between the floor and all adjacent building parts (walls, pipe penetrations, pillars, columns, etc.) must be avoided by installing an insulation foam strip.
6. First use the acrylic bonding primer weber.floor 4716 on the wooden substrates. Mix the concentrated material in a ratio of 1 : 1 and apply with a broom or a brush.
7. The system-compliant woven mesh weber.floor 4945 is laid wrinkle-free; each strip must overlap by at least 5 cm.
8. The mesh can be fixed to the substrate, e.g. with staple clamps, which prevent the fabric from shifting during the levelling work. The size of the staples should be chosen in such a way that a minimum of movement of the mesh to the substrate is ensured during installation.
Application

1. The quick-setting and -drying floor levelling compound for renovation and timber floors weber.floor 4320 is poured in lanes at the lowest point of the substrate.
2. Afterwards the levelling compound is uniformly spread up to the required layer thickness (min. 10 mm) either with a flat trowel or the notched blade scraper weber ABS Schwedenrakel and smoothed down. For very uneven floors, height marks should be set beforehand. The levelling compound is de-aerated by using the pre-said tool at a shallow angle.
3. Tiles can be fixed after 1 day, textile coverings, linoleum and PVC after 3 days and parquet, laminate after 7 days. The covering should first be de-coupled by installing the impact sound insulation and de-coupling systems weber.sys 830 or, for higher traffic loads, weber.sys 832, in order to accommodate ceramic coverings and natural stones.
4. Connection and movement joints must be closed with the elastic silicone joint sealant weber.fug 880 or weber.fug 881. In case of natural stones, use the specific sealant weber.fug 883.