Cavity Wall Insulation

The cavity typically varies from 50mm to 100 mm and may be unfilled or partially filled, this all depends on the building specification at the time of construction. When insulating the building, the operatives follow the NSAI and manufacturers drill pattern. This is to ensure that the cavities are fully filled. The holes are drilled into the external walls of the building and these holes are approximately (26mm). If the building is of brick construction smaller drill holes will be created on the joints, silver bead and adhesive is then pumped under pressure into the cavity.

All holes are patched by operatives after the pumping is complete. This is done by mixing different coloured dyes with mortar to closely match the existing finish or colour of the house.

For cavity wall insulation we use expanded polystyrene (EPS). This is injected in bead form and is bonded by using a Bostick glue which solidifies in the cavity. The bead is approved for installing in masonry cavity walls for both full fill and partial fill, this applies where there is a residual cavity width of 40mm or greater existing.

Filling the cavity with the Envirobead system allows the cavity to perform its function. The cavity is still able to breathe, the bead does not absorb water and will not transfer across the cavity to the inner leaf.

What are the benefits of cavity wall insulation?

• The biggest advantage is damp prevention, it prevents moisture from moving from the outer to the inner wall. A cavity wall will essentially prevent damp, the dampness is also prevented by installing wall ventilation which reduces the risk of mould.
• Cavity wall installation can reduce carbon dioxide emissions
• Cavity wall Insulation is one of the more cost-effective methods of insulation and there are various grants on offer
• U-value up to 0.35w/m²k

How much will cavity wall insulation cost?

Depending on the size of the house, our surveyor will provide a quote whether it is through the BEH Scheme or privately.

Better Energy Homes

What types of cavity wall insulation are available?

Any homes that were built and occupied before 2006 can apply for the Better Energy Homes Scheme. The process of applying for this scheme can be easily done. One of our surveyors would survey the property and give the customer a quote and explain to the homeowner what measures they would be entitled too for upgrade. If they are happy to proceed the application form is filled out and once approved work can progress.