weber.floor 4160, weber.floor 4310 or weber.floor 4190 on warm water underfloor heating as bonded systems.
These thin-layer underfloor heating constructions are special designs. Therefore the screed thicknesses may deviate from the minimum layer thicknesses specified in standards.
The maximum allowed loads on floors are as follows:
| weber.floor 4160 (with 5 - 10 mm pipe covering): | point loads ≤ 1 kN and surface loads ≤ 2 kN/m² |
| weber.floor 4190 and weber.floor 4310 (with 10 - 20 mm pipe covering): | point loads ≤ 2 kN and surface loads ≤ 3 kN/m² |
| weber.floor 4190 and weber.floor 4310 (with 20 - 30 mm pipe covering): | point loads ≤ 4 kN and surface loads ≤ 5 kN/m² |
For all systems the maximum allowed diameter of heating pipes is 12 mm.
Depending on substrate: acrylic bonding primer weber.floor 4716 or the epoxy primer weber.floor 4712 (very low emission) + scattering of silica sand on the epoxy primer.
Depending on the coverage: self-levelling, calcium sulphate-based, levelling compound weber.floor 4190, fibre-reinforced and flow cement-based floor levelling compound weber.floor 4310 or quickly ready for covering and high-flow cement-based underlay mortar weber.floor 4160 are used here.
With weber.floor 4310 the system glass fiber fabric weber.floor 4945 must be laid first.
Due to the long-lasting flow inside the heating elements, a restless surface will be given. Its smoothness is sufficient for laying ceramic tiles and parquet; for laying elastic floorings it is however recommended to level out the surface with an appropriate smoothing mortar (for ex. the anhydrite flow screed weber.floor 4095 or the cement-based high flow mortar weber.floor 4031).
Note that thin hairline cracks can occur due to the building geometry and the substrate condition. These cracks represent an optical failure and have no detrimental influence on the bonding strength and load-bearing capacity of the floor.
For laying ceramic tiles use the quick-setting and flexible flow-grade tile adhesive weber.xerm 860 F or the multi-use flexible tile adhesive weber.xerm 861. For laying other floorings (PVC, carpets, etc.) use an appropriate weber.floor glue.
