Substrate preparation - depending on substrate:
- Improvement of defective substrates where applicable
- Removal of loose material and basic cleaning of the substrate
- Rough levelling and improvement of defective substrates where applicable
Clean substrate with a broom; all dust and debris should be vacuumed from the surface. Smaller holes and height differences can be smoothed with weberfloor 4040 combi rapid.
There are many different impact sound insulation boards on the market with many different properties. Weber recommends weberfloor 4955 dB mat. The main property to look for is dynamic stiffness. The lower the dynamic stiffness, the better the sound-reducing effect.
However, too soft or thick insulation boards might indeed have a very low dynamic stiffness but are too soft to support the floor or provide the required point load capacity.
The impact soundboards are laid on the levelled floor and cut to adjust to special room geometries.
Soft strips (e.g. weberfloor 4960) should be installed on all rising building structures and penetrating pipework. To form a tight mould for pumping, apply a dividing layer, like for example weberfloor 4940 Geotextile, plastic membrane or waxed paper on top of the sound insulation material.
Should a cement-based material be used, weberfloor 4945 glassfibre mesh must be laid out on the surface. When laying out the mesh, ensure that the edges overlap by 50mm. If a calcium sulphate screed is used, no reinforcement mesh is needed.
As a load and heat distribution layer, five different self-levelling screeds can be used within the dB-Floor Concept:
weberfloor 4360 base flow rapid (self-drying) economical fibre-reinforced cementitious base screeds designed for floating floors up to 80mm thickness. The minimum thickness is 25mm offering a sufficient point load capacity and a good sound reduction at moderate costs. If PVC or linoleum will be used, grinding and manual smoothing will be needed.
weberfloor 4310 fibre flow (normal drying) or weberfloor 4320 fibre flow rapid (self-drying) fibre-reinforced, flexible cementitious screeds with a high polymer content. Recommended if PVC or linoleum is to be used and when you want to avoid a separate manual smoothing application(light grinding is still recommended due to the high fibre content). The minimum thickness is 25mm but it can be pumped up to 50mm.
The floor covering may be applied once the drying conditions are suitable. The indications referring to the readiness for covering apply to a dry substrate, a room air temperature of 20°C and a relative humidity of 50%. Air dehumidifiers, draughts and too high temperatures must be avoided.
Normal apartments can usually be done without any joints. In the case of unfavourable geometry (narrow long corridors or big areas where the uniform slab is "cut" by partitions), we recommend creating a "dummy joint" by cutting the slab approximately 5mm deep at such critical places. If the slab is to crack, it will crack in a controlled manner at these places but it will still be held together by the glassfibre mesh. If the floor covering requires a seamless and crack-free floor, these dummy joints can be injected as soon as the shrinkage stresses have ceased, i.e. when the screed material has dried out completely!
Dilatation joints in the building do not necessarily have to be adopted as this surface slab floats complete freely, independently of the building's dilatation joints. On the contrary, we can offer a seamless floating screed floors that also enable the tiling of large areas without joints and cracks.
Please note that small hair cracks may occur due to the building shape or the substrate. These are purely optical flaws and have no influence on the floor's adhesion or loading capacity.