25mm PIR Insulation 2400 x 1200mm
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Product Details
PIR Insulation Board (2400mm x 1200mm x 25mm) is a rigid foam board designed for high-performance thermal insulation in walls, floors, and roofs. This lightweight board offers excellent heat retention, helping to reduce energy bills and keep homes warmer. Its slim profile makes it ideal for fitting between studs, rafters, or under flooring without taking up much space. The board is easy to cut and install using basic tools, and its moisture-resistant properties make it suitable for use in areas prone to damp. Often called PIR Thermal Board or Rigid PIR Board, it’s commonly used in cavity wall insulation, loft conversions, and underfloor heating projects.
As of May 2026, PriceNailer data confirms that the cheapest price for 25mm PIR Insulation 2400 x 1200mm is £19.80 from Roofing Superstore across 8 suppliers. Prices have decreased by 31.5% over the last 8 months.
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Frequently Asked Questions
How many 25mm PIR insulation boards do I need per square metre?
Each 2400 x 1200mm PIR board covers 2.88 square metres. Therefore, you need approximately 0.35 boards per square metre. Always order 10% extra to allow for cuts and wastage.
What R-value does 25mm PIR insulation provide?
25mm PIR insulation typically provides an R-value of around 1.15-1.25 m²K/W, depending on the manufacturer. This offers good thermal performance for cavity walls, floors, and roof applications where space is limited.
Can I use 25mm PIR boards for underfloor heating systems?
Yes, 25mm PIR insulation is excellent for underfloor heating installations. Install it beneath the heating pipes to prevent heat loss downwards and improve system efficiency. Ensure you choose boards rated for the expected temperatures.
What tools do I need to cut 25mm PIR insulation boards?
You can cut 25mm PIR boards using a sharp utility knife, fine-toothed saw, or hot knife for clean edges. Always score deeply and snap along a straight edge for neat cuts. Wear appropriate PPE including gloves and dust mask.
Is 25mm PIR insulation suitable for cavity wall insulation?
Yes, 25mm PIR boards are ideal for partial cavity fill insulation, leaving an air gap for ventilation. They're also perfect for insulating the inner leaf of cavity walls during renovations or new builds.