Sound insulating LEWIS dovetailed sheet floor
Existing floor constructions in older commercial buildings and houses are often made of wood. In the case of major
repairs, renovation, restoration or a change in the function of such building, it often appears that these floor
constructions do not meet the current requirements for sound insulation.
LEWIS Dovetailed sheeting makes it possible to create a lightweight sound insulating floating floor on top of the
existing wooden or steel frame floor construction.
Sound insulation requirements
The government usually sets minimal requirements for airborne and impact sound insulation between rooms inside
buildings. If the underlying construction consists of wooden beams or a lightweight steel frame construction, a
lightweight additional floor surface will be necessary. Using a thin and therefore relatively light LEWIS sound
insulating (floating) floor, the desired sound insulation values can virtually always be realised.
LEWIS compartment floor
Generally, a simple standard LEWIS floor (type LWS-B0) amply meets the sound insulation requirements for compartment
floors. With the LEWIS LWS-B0 construction, LEWIS sound-insulating rock wool resilient strips are applied onto the
floor wood at the spots of the wooden beams.
The LEWIS Dovetailed metal decking is applied at right angles to the beams. Using LEWIS rock wool side strips, the
LEWIS sheet floor is kept free from the rising work around.
A layer of 34 mm fine gravel concrete or liquid screed is applied onto the Dovetailed metal sheeting. Underneath the
dovetailed metal sheet floor, a 12.5 mm thick fibreglass-reinforced plaster board ceiling will suffice. This
construction realises a performance of airborne sound Rw 55 and impact sound Ln 49.
LEWIS rock wool resilient strips are applied to LEWIS sound insulating floors as support materials by default. If the
centre-to-centre distance is greater than 800 mm and/or the use load is greater than 2.5 kN/m2, then we
would advise to apply LEWIS rubber granulate or LEWIS CDM PF resilient strips.