25mm PIR Insulation 8’X4′

Our 25mm PIR insulation is a high-performance solution for improving thermal efficiency across a wide range of building projects. Manufactured with a rigid polyisocyanurate (PIR) core and finished with composite aluminium foil facings on both sides, this board delivers excellent resistance to heat loss while also offering moisture and fire resistance.

Lightweight yet sturdy, the PIR insulation board 25mm is quick and easy to cut and install, helping to reduce labour time on site. Measuring 8x4 feet, it provides reliable coverage and can be used in multiple applications, including walls, roofs, floors, and between timber joists, making it suitable for both new builds and refurbishment projects.

Thanks to its superior thermal performance, this board is also ideal as 25mm floor insulation, where consistent insulation and durability are essential. And if your project requires different thicknesses, Mitcham Builders Merchants stocks a full range of PIR boards, from 25mm to 120mm, to suit your needs.

As South London’s largest independent builders' merchants, we offer the convenience of ordering online with same-day and next-day delivery options available depending on your location. You can also visit our Croydon branch to browse in person, where our expert team will be happy to provide you with advice.