Home, Repairs

How to improve sound and heat insulation in a floor screed

Insulation under floor

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The sound and heat insulation on the floor in the living area can be significantly improved by introducing a floating screed to boost sound and heat insulation in a floor.

It is very useful to install a sound and heat insulation in a floor when laying a new floor. However, it must be ensured that the substructure is stable, because the floating screed has no connection to the rest of the building. The thickness of the screed layer of 35 mm and the insulating layer of approx. 30 mm results in a height difference of at least 65 mm.

So it creates a correspondingly high level at the transition to the other rooms. The insulating layer for sound and heat insulation in a floor may consist of mineral wool, hard foam or cork. It is important that the screed has no contact with the wall or the floor at any point, otherwise the sound-absorbing effect would be eliminated. After 8 days, the screed mortar has hardened.

The insulating layer improves the thermal insulation. The absence of any connection to the rest of the structure precludes sound transmission to adjacent or underlying spaces.

The insulating material is protected against rising damp with a layer of oil or tar paper overlapping 10 cm.

The insulating layer must be closed seamlessly, so that there is no connection between screed and subfloor when laying.

The edge strip made of hard foam is used around the screed surface. It must be higher than the following screed everywhere.

The screed mass is applied in a damp state between the slats and distributed with a straight edge.

The slats are removed and the joints filled when the mass has tightened. The tread plates prevent footprints.

The screed smoother is finally used with gentle pressure over the surface, until all holes and bubbles are closed.

gerhardt-richter Gerhardt Richter is a writer and a trainer at trade technical colleges, specializing in carpentry, plumbing, mechanics and construction.