Cavity Wall Insulation
What is a ‘cavity wall’?
In most homes built after the 1920s the external walls are constructed of two brick or block walls with a 50mm (or more) cavity between them. This was designed to stop rain and damp from outside seeping through to inside walls. Your InstaGroup surveyor can find out how your home was constructed and offer the best insulation advice at your no obligation survey.
How straightforward is it to fit Cavity Wall insulation?
It is simple, clean and quick. Our specially trained installation teams work to ensure there is minimal disruption to your home life. Most of the work takes place outside your home, on the exterior walls, so you can carry on your daily life as usual.
How long does it take?
You should allow around half a day for an average 3-bedroom house.
Can I get a grant for Cavity Wall insulation?
Talk to us about getting your insulation through the Government-backed Green Deal scheme. Some householders could qualify for a grant worth up to 100% of the cost for this type of home improvement, as it helps meet the UK’s carbon emissions reduction target.
What happens at installation?
Our fully-trained installation team works from the outside of the house, drilling a series of small holes in the mortar of the brickwork. The specified insulation material is then blown in through these holes using a blowing machine to fill the wall cavity.
Do I need to prepare anything, or be at home during installation?
Every part of the wall must be filled with insulation, so it's important outside areas are cleared to ensure the installer can reach all your external walls. You should also take down pictures or remove fragile items positioned against inside walls, on shelves for example. This prevents any breakages from the vibration caused by the installation process.
Before and after installation the technician will need to do a few safety checks inside your property, so they will need access. Everything else is carried out from the outside.
Is it messy or noisy?
Cavity Wall insulation is a clean and efficient way to save money and energy in your home. You will notice the drilling noise, some vibration and the blowing of the insulation machine for an hour or two, and there is a little dust that the technicians will clear away on completion of the job.
Before finishing up, all the holes in the brickwork are filled with matching mortar, so you'll barely notice they were there.
Is it very expensive?
Ask us for a no-obligation survey of your home to find out more. Cavity Wall insulation can save you £155 a year on energy bills, and pay for itself in under 4 years.
How long does Cavity Wall insulation last?
InstaGroup Cavity Wall products have a 25 year guarantee under CIGA.
Will I notice a big difference?
Your rooms will feel warmer, and it will be easier to keep the heat in. You’ll notice it stays cooler in summer too.
My home is semi-detached – will Cavity Wall insulation affect my neighbour’s property?
If your home's external walls are joined to another house we will plan around this. Our installers use special wall cavity barriers that ensure the insulation material stays in your part of the building, so your neighbour’s home will not be affected.
If you think your neighbour may be interested in warming up their home please tell them about your plans to install Cavity Wall insulation, as we can easily insulate both homes at the same time.
Is there any maintenance or servicing after installation?
No. Your Cavity Wall insulation will last for the lifetime of the building. Normal building maintenance and repairs of walls should still be undertaken to ensure your home’s weather resistance.
How do I find out if my home is suitable?
Ask InstaGroup for a no-obligation survey. Your home will usually be suitable for Cavity Wall insulation if it is more than ten years old, its external walls are unfilled cavity walls, and the masonry or brickwork is in good condition.