75mm Insulation Board

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75mm Insulation Board Types and Applications A 75mm insulation board is one of the most commonly specified rigid board thicknesses in UK construction, delivering the thermal resistance needed for Part L Building Regulations compliance across the majority of wall, floor, and roof scenarios. At this depth, PIR and phenolic boards can frequently perform as a standalone solution rather than a supplementary layer, making 75mm the go-to specification for ground floors under screed, between-rafter pitched roof builds, and framed wall systems in both new build and refurbishment. At Insulation UK, we stock the full range of rigid insulation boards at this thickness from all the leading manufacturers, with competitive trade pricing and fast UK-wide delivery on every order. 75mm PIR Insulation Boards PIR insulation board at 75mm is the most widely used product in this range, offering a thermal conductivity of 0.022 W/mK in a foil-faced, lightweight format that is straightforward to cut and handle on site. At this depth, rigid PIR boards are suited to solid concrete and suspended timber floors, timber and steel framed wall systems, between-rafter pitched roof applications, and flat roof warm deck build-ups. Celotex GA4075 is one of the most widely specified PIR boards at this thickness, delivering reliable thermal performance across walls, floors, and roof applications. For floor insulation specifically, Kingspan ThermaFloor TF70 is a popular choice for both solid and suspended floor constructions and is compatible with underfloor heating systems. Kingspan ThermaWall TW55 is widely used in timber and metal stud framing, while Kingspan ThermaPitch TP10 is a common specification for between-rafter and below-rafter pitched roof work. Recticel Eurothane GP, Ecotherm Eco-Versal, and Unilin PIR are also stocked at this thickness, all sharing the same 0.022 W/mK thermal conductivity and foil-faced performance. 75mm Phenolic Insulation Boards Where maximum thermal performance within a