Wall, loft, and floor insulation guides
Kingspan, Celotex, Rockwool, Knauf and Superglass compared on published lambda, merchant price per square metre and fire classification, with prices checked in July 2026.
Sheep's wool costs roughly five times more than glass mineral wool for a 14% better lambda and a worse fire class. Where that trade makes sense, and where…
PIR needs half the thickness of mineral wool and costs several times more per square metre. A straight comparison on U-value, cost at equal resistance, fire class, moisture…
Superglass Multi-Roll 44 reviewed on lambda, Euroclass A1 fire performance, recycled glass content and CCPI certification, with July 2026 prices set against Knauf Loft Roll 44.
Knauf retired the Earthwool name but merchants still use it. Loft Roll 44 and DriTherm cavity slabs reviewed on lambda, fire class and the large gap between trade…
Rockwool RWA45, Flexi and Twin Roll reviewed on published lambda, density, Euroclass A1 fire performance and July 2026 merchant pricing, with a straight answer on when to buy…
Celotex is now Sopratherm after Soprema bought the business from Saint-Gobain. Same product codes, same 0.022 W/mK PIR. Prices and specifications checked July 2026.
Kingspan Kooltherm phenolic at 0.019 W/mK against Therma PIR at 0.022, with July 2026 merchant prices, fire classifications and the Grenfell Inquiry findings reported in full.
A well-insulated garden office costs pennies an hour to keep warm; an uninsulated one is unusable half the year. How to insulate floor, walls and roof — and…
A heat pump is sized to your home's heat loss — so insulating first buys you a smaller, cheaper unit and lower bills forever. Our worked example puts…