Loft Insulation Boards

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Loft Insulation Boards Loft insulation boards are one of the most effective ways to reduce heat loss in both domestic and commercial buildings. Up to 25% of a building's heat can escape through an uninsulated roof, making the loft one of the highest-priority areas to address. Rigid insulation boards offer a slim, high-performance alternative to loose mineral wool, particularly suited to loft conversions and rooms-in-roof where space is limited. When to Use Rigid Loft Insulation Boards Rigid boards are the preferred choice when: Converting a loft into a habitable room and insulating between or below rafters Topping up existing insulation where additional thickness is impractical Insulating a flat or low-pitch roof where roll insulation won't fit A precise U-value target needs to be hit with minimal build-up PIR Boards for Loft Insulation Our loft insulation boards are primarily PIR (Polyisocyanurate), offering the best thermal performance per millimetre of thickness. This makes them ideal for between-rafter and below-rafter applications in loft conversions, where every millimetre of headroom counts. Available in a range of thicknesses from 25mm to 150mm. Next-Day UK Delivery All loft insulation boards are available for next-day delivery across mainland UK on qualifying orders. Browse the full range below and filter by thickness or brand to find the right board for your project.