The benefits of cavity wall insulation
- Less heat loss through your exterior walls and lower heating bills.
- Warmer interior walls and greater comfort.
- Quick to install, usually within a day.
- No work inside your home: everything is done from outside.
- Can improve your home's energy rating.
- Grants are often available.
The drawbacks and things to consider
Cavity wall insulation isn't suitable for every home. Here are the key things to consider:
- The wall cavity must be wide enough and sufficiently clean.
- Damaged pointing or external walls must be repaired first.
- Existing insulation, such as urea-formaldehyde (UF) foam, requires further investigation.
- Good ventilation in your home remains important.
Which material is best?
Greenisolatie uses blown-in glass wool. Glass wool is water-repellent, breathable and non-combustible, and does not shrink. Find out more in our article on glass wool cavity wall insulation.
How do you know if your home is suitable?
Homes built between around 1920 and 1975 often have uninsulated wall cavities. An inspection will tell you for sure. Our adviser visits your home free of charge, checks the cavity and pointing, and gives you an honest assessment of whether cavity wall insulation is worthwhile.
Frequently asked questions
Can cavity wall insulation cause damp problems?
Not if your external walls and pointing are in good condition and a suitable material such as glass wool is used. That is why we always inspect the cavity and external walls beforehand.
How soon will you notice a difference?
Most people notice that their walls feel less cold immediately after the insulation is installed.