Phenolic Insulation

About

Phenolic Insulation Boards Phenolic insulation offers the highest thermal performance of any rigid insulation board on the market. With the lowest lambda values available — typically around 0.018–0.020 W/mK — phenolic boards allow you to achieve demanding U-value targets with significantly thinner profiles than PIR or EPS alternatives. This makes them the go-to choice wherever build-up depth is at a premium. Why Choose Phenolic Insulation? Phenolic boards are manufactured from a rigid closed-cell foam faced with a low-emissivity foil on both sides. Key advantages include: Best-in-class thermal performance — the lowest lambda values of any mainstream insulation board Slim profiles — achieve the same U-value with less thickness compared to PIR or EPS Low moisture absorption — closed-cell structure resists water ingress Lightweight and easy to handle — simple to cut and install on site Fire performance — many boards carry Class 0 or Class 1 fire ratings Applications Phenolic insulation boards are suitable for a wide range of applications including flat and pitched roofs, internal and external wall insulation, and floor insulation. Their slim profile makes them especially popular for internal wall insulation where preserving room dimensions is important. Fast UK Delivery We offer next-day delivery on qualifying orders across mainland UK. Browse our full range of phenolic insulation boards below, available in multiple thicknesses to suit your project specification.