wall insulation was introduced in Northwest Europe during the 19th
Century but its usage didn’t begin to increase until the 1920s. In the
UK, widespread installation of cavity wall insulation didn’t take place
until the 1970s and it wasn’t until the 1990s that its installation
became a compulsory building regulation. Hence, a large proportion of
pre-1970s houses have poor insulation.
is cavity wall insulation?
wall insulation is a filling placed between the internal and external
walls of a property. The porous material used helps to reduce the heat
loss through the walls, storing heat within the home for longer.
materials are used?
are three different types of cavity wall insulation materials used in
mineral wool: Most commonly known as rockwool, this material
is the most popular and widely used choice for cavity wall insulation.
It consists of mechanically granulated spun glass or rock wool which is
treated by water and a binder during the time of manufacture. The
material is installed by being blown into the cavity and has a reliable
life-expectancy, matching the life of the building. The material does
not absorb water and does not allow for any moisture to enter the home.
Foam - Also known as foam cavity wall
insulation nes, Urea Formaldehyde foam can be injected
into the cavity through small spaces, moulding itself into a rigid
insulate shape. This type of insulation material is ideal for walls with
narrow joints or narrow cavities.
beads - A rather different means of cavity wall insulation is
expanded polystyrene beads (EPS beads). During installation, these beads
are combined with an adhesive material then pumped into the wall
cavity. This type of insulation is also suitable for narrower cavities.
process of installation is quick and easy, usually taking around two
are the benefits of cavity wall insulation?
to the National Insulation Association, the average home loses more
than 40% of its heat through cavity walls. cavity
insulation helps to prevent this means of heat escaping,
maintaining the temperature within the property for longer. The
insulation also aids with maintaining a more even temperature and
combats draughts produced by the walls. As heat loss is decreased, the
need for energy consumption is decreased, helping property-owners to
save on their energy bills.
cavity wall insulated homes attain a higher home energy rating and a
lower carbon footprint.
Is my home suitable for cavity wall insulation?
home should be suitable for cavity wall insulation if it fits these
The external walls are unfilled cavity walls
The cavity between the walls is at least 50mm wide
The brickwork is in good condition
The house is more than ten years old
The walls are not exposed to driving rain
Check if the walls have damp
The external walls are easy to access
The walls are not affected by damp
are planning to go ahead with cavity wall insulation, you must check
that your chosen installer is properly qualified. The installer should
be a member of the National Insulation Association (NIA), the Cavity
Insulation Guarantee Agency (CIGA) or the British Board of Agreement
(BBA). It is also recommended that you verify the installer has signed
up to the code of professional practice and that the installer
guarantees the installation for 25 years.
The Significance of Cavity Wall Insulation