Cavity wall insulation is injected through the outer wall of your home ... If you're not yet a member, you can get instant access by joining Which?. Injected polystyrene beads to wall, cavity width ...

A registered installer will check your property’s suitability for cavity-wall insulation and recommend the best type to use. Commonly used insulating materials include mineral wool, polystyrene beads ...

Walls 35 Cavity wall insulation fills the cavity between the outside walls with mineral wool, polystyrene beads or foam. Trapped air between fibres, beads or within foam reduces heat loss by ...