Roof Insulation

Insulation for pitched and flat roofs: PIR boards for between and under rafters (Kingspan Thermapitch TP10, Recticel Eurothane GP, Kooltherm K107), flat roof boards for warm decks (Kingspan Thermaroof, Recticel Eurodeck and Powerdeck), multifoil and mineral wool slabs. Prices are ex VAT, with a £400 ex VAT minimum. Delivery is free in England, and £40 + VAT to mainland Wales and mainland Scotland.

Shop roof boards by brand: Celotex roof insulation, Kingspan roof insulation and Recticel roof insulation.

For pitched roof insulation, PIR boards between and under the rafters are the usual choice. For flat roof insulation on a warm deck, use a dedicated flat roof board such as Kingspan Thermaroof, Recticel Eurodeck or Powerdeck. Not sure how thick to go? See our PIR thickness guide or try the free PIR U-value calculator.

Not sure what goes where? See our where to insulate guide for lofts, roofs, walls, floors, partitions and ceilings.

Related guides

• Discover the Power of 25mm Kingspan TP10: Your Go-To Insulation for Pitched Roofs
• What Thickness of PIR Insulation Do I Need? A UK Guide for Floors, Walls and Roofs
• How to Insulate a Shed or Garage: Walls, Roof and Floor