Is Cavity Wall Insulation Suitable for My Home?
Considering cavity wall insulation but you’re not sure if it’s worth it? No need to worry, we got you covered. Did you know that about a third of all the heat lost in an uninsulated home escapes through the walls, according to the Energy Saving Trust.
Cavity wall insulation fills all the gaps that can be found between external walls in homes, keeping the warmth in, to save both energy and money. But that’s not all, insulating your cavities can also help reduce condensation inside the house if this is a problem stemming from your external walls.
Your property will usually be suitable if it meets the criteria:
The masonry or brickwork of your property is in good condition
Your cavity is at least 50mm wide
External walls are unfilled cavity walls
It is more than 20 years old
The Big Question: Do I Have Cavity Walls?
It’s easier than you think, there are 3 simple steps to check yourself which will tell you if your home has a cavity wall. If in doubt, we can carry out a free professional survey.
Check 1: How old is your home?
Cavity walls didn’t really start to be used in general building construction until the early 1930s, which is why the age of your home is a vital first step. If you have an old house without cavity walls then check out what to do here.
When was your house built?
Before 1932 – Unlikely to have a cavity wall
1932 to 1982 – Highly likely
After 1982 – Almost Certain
Check 2: What pattern are the bricks on your external walls?
There are 3 common types of brick walls.
Check 3: Measure the thickness of your external walls
Cavity walls tend to be thicker than solid walls because they have an air gap between the external and internal wall. It’s easy to measure, simply open your front or back door and measure from the outside face of the external wall, through the door to the inside face of the internal wall. Please note: Layers of internal plaster or external render will affect the thickness so a rough figure will do.
Outside Wall Thickness:
Less than 30cm (11.5 inches) – No Cavity Wall
More than 30cm (11.5 inches) – Yes. You got a Cavity Wall
Solution: Icynene Classic Pour Fill Insulation
At Evergreen Power we offer Icynene pour and spray insulation. This is a breakthrough in the science of moisture and thermal management. The pour fill insulation is installed through a hole drilled into the wall. As it slowly expands over 3-5 minutes it begins to seal all cavities and tiny spaces.
Icynene is the leading 100% water-blown foam insulation that minimises air leakage for increased energy efficiency, creates a healthier indoor environment, reduces airborne sounds and offers greater design freedom. Icynene maintains its performance with no loss of thermal resistance over time. It does not shrink, sag or settle. Icynene adheres to most construction materials and is the perfect insulation for walls, attics, ceilings and floors.
Icynene’s pour fill variation is an insulation and air barrier that injects the latest building technology into an older building to maximise energy efficiency while still preserving its original architectural details. Icynene fills the wall cavity completely, starting at the bottom and slowly expanding upwards to 60 times its initial volume. Since Icynene expands in the direction of least resistance, it will not expand outward and damage the wall. The pour fill formula has a thermal conductivity of 0.034 – 0.039 W/mK.
Frequently Asked Questions
What is cavity wall insulation?
Cavity wall insulation fills the gaps between external walls. Every part of the wall must be filled with insulation correctly, so its important the right installer does it for you.
How is the insulation installed?
To insulate your cavity walls, the installer drills small holes at intervals in the outside wall of your home. The installer then blows insulation into the cavity using special equipment. Once all the insulation is installed, the installers fill all the holes in the brickwork.
Can I do the insulation myself?
Filling cavity walls is not a job you can do by yourself, you will need to hire a professional contractor.
What wall type do I have?
Houses in the UK mostly have either solid walls or cavity walls: A cavity wall is made up of two walls with a gap in between, known as the cavity; the outer wall is usually made of brick and the inner layer of brick or concrete block. Whereas a solid wall has no cavity, each wall is a single solid wall, usually made of brick or stone.