Best Loft & Wall Insulation UK (2026) — Page 3

Pros

• Foil-backed PIR board gives a high insulation value for a relatively thin panel
• Supplied as equivalent stock from Recticel, Celotex or Kingspan depending on availability
• 5-board bulk pack suits a full loft, wall or floor insulation project

Cons

• Large pallet-size order needs van access or ground-floor delivery space

Pros

• Stone wool slabs give excellent thermal, acoustic and fire performance
• Euroclass A1 non-combustible rating for added fire safety
• Water-repellent finish holds up well in partition wall and floor voids

Cons

• Rigid slabs are less forgiving than roll insulation around odd joist spacing

Pros

• High-performance foil-faced PIR boards for roofs, walls and floors
• Bulk 10-board pack covers a large loft conversion or extension in one order
• Supplied as Celotex, Kingspan or an equivalent brand of identical spec

Cons

• Very bulky pallet delivery needs ground-floor access and someone to help unload

Pros

• Itch-free polyester alternative to traditional glass mineral wool
• Non-toxic construction is more comfortable to handle without a full mask and suit
• 110mm thickness suits loft, roof and wall top-up jobs

Cons

• Polyester rolls are bulkier to compress into loft storage bags than mineral wool

Pros

• 3-in-1 multifoil combines thermal insulation, vapour barrier and radiant foil in one roll
• Slim profile saves internal space versus thick mineral wool builds
• Suits loft, roof, wall and floor applications from a single product

Cons

• Needs taped, sealed laps to perform properly, so installation is fiddlier than a simple roll

Pros

• Rigid stone wool slabs hold their shape well in stud walls and floor voids
• Strong acoustic performance for party walls and internal partitions
• Non-combustible with a good fire-resistance rating for building regs compliance

Cons

• Denser and itchier to handle than lightweight glass mineral wool rolls