British rigid Urethane Foam Manufacturers' Association

Fully filled cavity wall insulation

A PUR or PIR foam system can injected into the cavity via holes in the outer leaf producing insulation with excellent adhesive and structural properties. The product bonds the inner and outer leaves together thus eliminating the problem of wall tie failure.

The table below compares the improvements that can be achieved by installing various cavity wall insulating products at a cavity thickness of 50mm in the conventional cavity wall.

The lower the U-value the better the insulation performance.

Insulating product (Thermal conductivity W/m.K) U-value (W/m².K)
PUR (0.025) 0.40
Expanded polystyrene beads (0.037) 0.55
Mineral fibre (0.039) 0.57
Urea formaldehyde (0.040) 0.58
No insulation 1.50

To download our brochure on the applications of polyurethane insulation click here

Benefits of PIR/PUR insulation for cavity walls (fully filled):

For further information please contact:

BASF Polyurethanes UK Limited

Isothane Limited