40mm Wall Thickness Pipe Insulation

40mm Wall Thickness Pipe Insulation — UK Specialist Supplier

Shop our range of pipe insulation with 40mm wall thickness, available in Kingspan Kooltherm phenolic foam, Kingspan K-Roc mineral fibre and Rockwool Rocklap stone wool. 40mm wall insulation is specified for large bore commercial and industrial heating pipework, district heating networks and high-temperature applications where BS 5422 requires maximum insulation thickness.

Available Products

Kingspan Kooltherm 40mm Wall — Premium phenolic foam with λ = 0.025 W/mK. Meets BS 5422 for large-bore commercial heating pipework (up to approximately 114mm OD). Class O fire rated, foil faced. Achieves the same compliance as thicker mineral wool at a reduced wall section
Kingspan K-Roc 40mm Wall — Mineral fibre pipe insulation with A2 fire classification. λ = 0.033 W/mK, reinforced aluminium foil facing with self-adhesive closing lap. Specified for large-bore high-temperature heating and steam pipework in commercial and industrial plant rooms
Rockwool Rocklap 40mm Wall — Foil-faced stone wool pipe sections. A1 non-combustible (Euroclass A1), rated to 750°C continuous operating temperature. The standard specification for large-bore high-temperature industrial pipework

Why Choose 40mm Wall Thickness?

BS 5422 compliance — 40mm Kooltherm meets the minimum insulation requirement for large-bore commercial heating pipework (up to approximately 114mm OD) under BS 5422
Industrial-grade thermal performance — 40mm wall minimises heat loss from large-bore pipework, reducing energy costs in industrial plant and district heating networks
A1 non-combustible — Rockwool Rocklap achieves Euroclass A1, essential for fire-critical industrial and commercial specifications
Extreme temperature capability — mineral wool maintains full performance at continuous operating temperatures up to 750°C

Common Applications

Large-bore commercial heating mains (LTHW and MTHW) up to 114mm OD
District heating and heat network pipework
Industrial steam pipework and process pipework
Large plant room and boiler house pipework
Fire-rated pipework in commercial and industrial buildings

40mm vs 30mm vs 50mm — Which Should I Choose?

30mm wall is typically specified for medium-bore pipework up to 60mm OD. 40mm is the step up for larger bore pipework where BS 5422 requires a thicker section. 50mm is the maximum standard wall thickness for the most demanding industrial and process applications. See our wall thickness guide for full details.