90mm Kingspan TW55 ThermaWall PIR Insulation Board 2.4m x 1.2m Pallet Accessories Membrane should be clean &

Membrane should be clean & dry at the time of jointing

Ensure snug fit without gaps

because both share a thermal conductivity of 0

Best results are when it is used as part of a full system

20 m²K/W of thermal resistance while filling most standard joist and rafter bays in a single layer

90mm Kingspan TW55 ThermaWall PIR Insulation Board 2.4m x 1.2m Pallet Accessories Membrane should be clean &90mm Kingspan Thermawall TW55 is a rigid thermoset polyisocyanurate (PIR) wall insulation board faced both sides with a low emissivity composite foil, supplied at 2400mm x 1200mm with 2. 88m coverage. The declared thermal resistance is 4. 05 mK W at a thermal conductivity of 0. 022 W mK. Crossing the 4. 0 mK W mark in a single 90mm layer is what makes this thickness worth specifying. Kingspan's example figures show 90mm between 140mm deep timber studs