Cavity Wall Insulation
Overview
Cavity wall insulation is an effective way to improve the energy efficiency of buildings. The U-value represents the heat transfer rate through a building component, with lower U-values indicating better insulation. Here are some common cavity wall insulation options available, along with their corresponding U-values:
Expanded Polystyrene Beads (EPS)
Expanded Polystyrene Beads (EPS)
- EPS beads can be injected into the cavity wall and provide insulation. The U-value for EPS cavity wall insulation typically ranges from 0.35 W/m²K to 0.55 W/m²K.
Mineral Wool
- Mineral wool insulation is made from rock or glass fibers and is available in batt or blown-in form. The U-value for mineral wool cavity wall insulation typically ranges from 0.18 W/m²K to 0.35 W/m²K.
Phenolic Foam
- Phenolic foam insulation boards can be installed in the cavity to provide thermal insulation. The U-value for phenolic foam cavity wall insulation typically ranges from 0.15 W/m²K to 0.24 W/m²K.
Polyurethane Foam (PUR)
- Polyurethane foam insulation is a spray-applied material that expands and fills the cavity. The U-value for polyurethane foam cavity wall insulation typically ranges from 0.16 W/m²K to 0.21 W/m²K.
Polyisocyanurate Foam (PIR)
- Polyisocyanurate foam insulation is similar to polyurethane foam and provides good thermal performance. The U-value for polyisocyanurate foam cavity wall insulation typically ranges from 0.16 W/m²K to 0.21 W/m²K.
Blown-In Cellulose
- Blown-in cellulose insulation consists of recycled paper fibers treated with fire retardants. The U-value for blown-in cellulose cavity wall insulation typically ranges from 0.18 W/m²K to 0.32 W/m²K
Please note that the U-values provided are approximate and can vary depending on the specific product, installation method, and cavity wall construction.
It's important to consult with insulation specialists or contractors who can assess your property and recommend the most suitable insulation option with the desired U-value for your cavity walls.