Floor Screed Thickness Over Insulation

There will be a damp proof membrane under the insulation and possibly a second membrane on top depending on the type of screed.

Floor screed thickness over insulation.

Minimum screed thickness over insulation. 2 first things first insulation for radiant heating systems. 3 1 choose your contractor wisely. If the screed is on top of insulation there is going to be move give or movement than being laid.

Insulation is laid on the concrete and covered with a screed. 3 semi dry floor screed what is it and what thickness is best. 4 2 advantages of liquid. If we can now look at the floor screed thickness over insulation for different types of screed.

When it is over insulation it is normally termed as floating. The builder rang the plasterer to do the screed and he said can you leave the celotex insulation down and i will screed over that. Had a builder put a floating floor down and i refused to tile on it and said that i wanted it screeded. Liquid screed can be applied over insulation floating application either thermal or acoustic at a depth of 40mm in domestic applications and 40mm in commercial applications.

The insulation type and thickness should be confirmed by calculations to comply with the relevant regional building regulations taking into account the specific shape and size of the floor. The optimum thickness of a sand and cement bonded screed is 25 40mm an unbonded screed should have a minimum thickness of 50mm whilst a floating screed should have a thickness greater than 65mm for lightly loaded floors and 75mm for more heavily loaded floors. Calcium sulphate flowing screed some people call it liquid screed or flow screed. 2 1 insulation shouldn t stop at the floor.

I m not happy that this is going to be a secure surface either as the celotex isn t fixed to the substrate. In this scenario a rigid foam insulation is usual and as you d want the same u value in the roof we need the same thickness of insulation 180mm. 4 liquid screed for underfloor heating systems. A minimum thickness of 65mm is possible provided the thermal insulation boards.

In combination with underfloor heating the minimum cover required over the pipe is 30mm as per bsen 13813 2002. You may want to increase the actual kpa value of the insulation to withstand the loadings. When we talk about a minimum thickness we would need to look at the type of floor construction the screed is going onto.