Decoupled Wall Soundproofing

Decoupled Wall Solution 43.5mm - 46mm

Application: Most common solution with high performance and minimal loss of space for reasonably flat and true wall.

Construction (Flat Brick or Block):
- wall with or without existing plaster or plasterboard.
- 16mm Resilient Bars (optional 20mm mineral wool infill).
- 15mm Phonewell® Acoustic Insulation.
- 12.5mm or 15mm sound resistant plasterboard.
- (optional second layer of plasterboard)

Materials List (available from our stockists)
- resilient bars (3m x 75mm x 16mm)
- 6mm hammer fixings to secure resilient bars into blockwork
- Phonewell® acoustic insulation (1200mm x 800mm x 15mm)
- drywall screws (25mm length)
- sound resistant plasterboard (2400mm x 1200mm x 12.5 or 15mm)
- drywall screws (38mm length) - if bonding plasterboard to Phonewell® use adhesive foam and foam gun (approx. coverage per can is 15m²)

Instructions: (have you considered Flanking Noise?)
1. Make existing wall sound by removing any loose material.
2. Secure resilient bars horizontally at 600mm centres with hammer fixings, being careful not to kink or obstruct the flexibility of bars.  Ensure bar ends do not touch the adjacent walls - leave a 5mm gap.  Note: the first and last bars should be approximately 50mm clear of the floor and ceiling. The ceiling bar can be reversed to ease installation.
3. Optionally insert 20mm wool between bars being careful not to restrict flexibility of bars.
4. Screw Phonewell® into resilient bars with 25mm drywall screws, being careful to leave screwhead just below surface. Do not leave any gaps. See Cutting Phonewell.
5. Screw plasterboard through Phonewell® into resilient bars with 38mm drywall screws (or bond with adhesive foam), being careful to stagger joints and leaving a 5mm perimeter gap around floor, walls and ceiling. Optionally add a second layer of plasterboard.
6. Seal 5mm perimeter gaps with flexible mastic or acoustic sealant.
7. Tape and seal all plasterboard joints and fill screw heads.
8. Fit skirting boards ensuring no contact with the floor – leave a 2mm gap.