Hello. We are about to install a floating screed for the underfloor heating. The base slab is very uneven, with the level varying between 17.5cm (7 inches) and 19.8cm (7.8 inches). Therefore, the insulation and screed layers need to be planned accordingly. So, I can’t build the height of the construction higher than 17.5cm (7 inches) including the finished floor, right?
Normally, the screed is planned to be 4.5cm (1.8 inches) above the heating pipes. This is generally seen as the minimum thickness. However, how should the maximum screed thickness be handled? Do you have any experience or recommendations regarding this, especially related to the heating system? At the spots with 19.8cm (7.8 inches), I would have to apply about 2cm (0.8 inches) more screed. That means it would be 4.5 + 2 + 2 (for the heating pipes) = 8.5cm (3.3 inches). Could this cause any problems? Vinyl flooring is planned as the final surface.
Additionally, I would like your advice on what you recommend for insulating the spaces above the supply and return pipes. Perlite? Our screed installer has suggested expanded clay aggregate with some added cement.
Normally, the screed is planned to be 4.5cm (1.8 inches) above the heating pipes. This is generally seen as the minimum thickness. However, how should the maximum screed thickness be handled? Do you have any experience or recommendations regarding this, especially related to the heating system? At the spots with 19.8cm (7.8 inches), I would have to apply about 2cm (0.8 inches) more screed. That means it would be 4.5 + 2 + 2 (for the heating pipes) = 8.5cm (3.3 inches). Could this cause any problems? Vinyl flooring is planned as the final surface.
Additionally, I would like your advice on what you recommend for insulating the spaces above the supply and return pipes. Perlite? Our screed installer has suggested expanded clay aggregate with some added cement.
Subwkloofer16 Jul 2020 10:20Is there a DIN standard where this can be looked up, or is it just a guideline?