Uplift the existing floorboard / chipboard floor to expose the joists and cavity. Clear the cavity and install 100mm RWA45 Rockwool into the cavity at the bottom leaving an airgap at the top of the cavity. Friction fit the insulation tight within the cavity and infill any small gaps with insulation.
Ensure your joists are level. You can pack out the top of the joists to level them or in extreme cases strap new timbers to the existing joists to level them. Install STS Board 22mm over the joists. Install in a brick bond pattern. The STS board can be cut with a circular saw or festool with appropriate extraction. use the STS adhesive within the tongue and groove joints and the STS screws to fix down the boards to the joists. Leave a 5mm expansion gap around the perimeter of the room where the boards meet the wall and infill with an acoustic sealant.
Once the STS board is installed created a sound solid subfloor next install the Tecsound 100. Roll out the Tecsound and but joint the rolls, install tightly to the walls. If required the Tecsound can be glued down using the self adhesive version or approved adhesive such a Mapei Elastorapid vs90. Install the adhesive using a 3mm notched trowel. Again use an acoustic sealant around the perimeter of the Tecsound. Tecsound is easily cut with a straight edge and a stanley knife.
Over the Tecsound install the dB Matting 15. Install the dB Matting in a brickbond pattern and bond down to the Tecsound using the Mapei Elastorapid adhesive with a 3mm notched trowel. The dB Matting is cut using a straight edge and stanley knife, ensure you have new sharp blades and repeatedly score the matting along the straight edge to get a clean cut. The matting can be installed tightly to the wall at the perimeter, any gaps can be infilled with acoustic sealant.
Wood and laminate can now be installed directly to the dB Matting, always check with your flooring supplier they are happy with this. We recommend using a tongue sand groove wood floor and only gluing the joints of the flooring, however wood floor can be glued onto dB matting if required.
