Density matters more than thickness for soundproofing. RW3 (60kg/m³) is the industry standard for 60-minute fire ratings in partition walls. If you are insulating a home cinema or a noisy flat conversion in London, upgrading to RW5 (100kg/m³) provides significantly better low-frequency noise reduction.

Modern UK building regs recommend a total depth of 270mm to 300mm for mineral wool. If you already have 100mm between your joists, don't replace it—just 'top up' by laying a 200mm layer at right angles across the joists. This reduces 'thermal bridging' through the wooden timbers.

For floor insulation, 100mm PIR is the 'sweet spot' to meet the standard U-value. If you're insulating a roof to 2026 standards, you'll likely need 125mm–140mm to hit the target. Always tape joints with foil tape to create a continuous vapour barrier and prevent interstitial condensation.

The fastest way to dry-line cold solid walls. When 'dot and dabbing' these boards, ensure you apply a continuous 'ribbon' of adhesive around the top and bottom of the board and around any sockets. This prevents cold air from circulating behind the board, which is the #1 cause of hidden mould growth.

Yes, of course! In London bathrooms or kitchens, standard plasterboard isn't enough. Use Moisture-Resistant (Green) Plasterboard combined with a dedicated Vapour Control Layer (VCL). This stops warm, humid air from reaching the cold brickwork behind your insulation, keeping your walls dry for years.