Hemp-Light clay LLS 200, sound insulation

Perfect impact sound insulation in older buildings

The lightweight version of hemp light clay is intended for floor build-ups. Beneath floorboards or screeds, the loose fill can be used as impact sound insulation and levelling fill. The light clay is placed in layers of max. 7 cm thickness and lightly compacted with a tool. During compaction the hemp shives lie flat, so that no voids remain. The substructure for the floorboards can then be laid on top and used to level the second layer.

The floorboards can be screwed directly to the floating substructure. The load is transferred across the entire surface to the slightly resilient light clay. This build-up feels very soft and pleasant underfoot.

Impact sound in timber-framed houses

In a timber-framed house, LLS 200 from Hanffaser Uckermark is ideal for creating a shallow, lightweight floor build-up with a high level of impact sound insulation. The light clay is spread over the clay-wrapped staves of the ceiling, and the battens for the floorboards are bedded in the light clay alongside the ceiling joists. The light clay is then filled up to the top edge of the battens. The load is distributed over the entire surface, and sound is no longer transmitted directly via a ceiling joist, as the floorboards and ceiling joists are not in direct contact. The key prerequisite here is the stability of the clay ceiling, which must always be checked. The reduction in impact sound is achieved not by the fill material but solely by the decoupling. This means that contact between the battens and the ceiling joists should be avoided.

Impact sound insulation systems must always be installed as floating constructions. This means that the LLS 200 is compacted and the floor build-up is then laid on the fill without any connection to the substructure. With floor build-ups using LLS 200, the insulation will settle slightly during the initial period. Skirting boards should therefore be fitted at a later stage, and the entire build-up should be made approx. 5 % higher. Once all voids have been compacted after the initial phase, the material does not settle any further. No further abrasion or associated settlement of the build-up occurs.