Fully filled cavity wall insulation
A polyurethane (PUR) foam system can be injected into a cavity of a property via holes in the outer leaf producing insulation with excellent adhesive, structural and thermal 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.
|Typical thermal properties of injected cavity fill insulation|
|Insulating product (Thermal conductivity W/m.K)||U-value (W/m².K)|
|Expanded polystyrene beads (0.037)||0.55|
|Mineral fibre (0.039)||0.57|
|Urea formaldehyde (0.040)||0.58|
To download our brochure on the applications of polyurethane insulation click here
Benefits of PIR/PUR insulation for cavity walls (fully filled):
- Provides the best thermal performance of all practical full cavity insulants;
- Resistant to all climate exposure conditions;
- Ensures continuity of insulation and does not settle or leave part of the cavity uninsulated;
- Gives a useful life in excess of 50 years with a constant thermal performance;
- Eliminates the risk of water penetration;
- Recommended by the Environment Agency as a measure to reduce flood damage to walls;
- Resistant to moisture ingress;
- Provides wall stabilisation, especially useful where wall ties are failing;
- Have a British Standard specification and code of practice for their installation (BS 7456 and BS 7457);
- Products can be installed with no disruption to occupants or other on-going activities;
- They are BBA approved for use anywhere in the country (unlike other types of insulant whose use is geographically restricted);
- Non-fibrous insulation which does not emit harmful emissions;
- Do not support the growth of fungi.