. 100mm (min) existing solid masonry wall plastered on both faces

. Independent timber or steel studs. Min 10mm gap to be maintained between frame & existing wall

. 50mm Rockwool Flexi between studs (ADE requires min 35mm)

. 2 layers of plasterboard min 20Kg/m² (approx=to 2x15mm std wallboard or 2 x 12.5mm E-check plasterboards)

. Avoiding flanking transmission: seal perimeter edges of new plasterboard with tape or Rockwool Acoustic Sealant

. If existing masonry wall is not plastered or less than 100mm thick then independent panels should be applied to both sides

. Pre-completion site testing is required