The perfect cavity wall insulation solution for
hard to treat homes...
Polyurethane cavity wall insulation and wall stabilisation
injection foam is now the number one choice for
cavity wall insulation, more so due to rising energy costs
and a general global energy saving initiative. There are
many reasons for this, which mainly lie in the extensive
benefits offered by the lightweight and unique nature of
the cavity insulation foam substance, and its ability to
bond to almost any material.
All cavity wall
installations come with a guarantee
random stone cavity walls
materials and installers
water resistant closed cell foam
reduces energy loss
Cavity Retro Fit wall tie foam
- bonds both leaves together
used in walls with existing 'rat trap' wall ties or
The cost to insulate a typical three
bedroom house cavity wall using PU foam is usually around 8 times
more expensive than similar types, such as glass fibre
for example. We would price a three bed semi at around
£1900 - £2500 (ex VAT) depending on how far away the
house is from our base in Doncaster.
We are currently taking a large
volume of cavity wall insulation enquiries, so please bear the
above ballpark prices in mind when calling. A much
larger project, i.e block of flats, large detached house
etc, can benefit from better rates per sq metre.
Random stone walls
usually present a problem when considering cavity wall
insulation. Established products such as Rockwool and
polystyrene beads prove difficult to use due to the
uneven inner surface of the stone outer leaf. This can
result in 'dead spots', uninsulated areas which could
vary in size. This obstacle is instantly overcome by
using cavity wall foam insulation, besides acting as a wall
tie, being 99% waterproof and extremely rigid, it is
also the best insulator per thickness on the market
Multistorey apartments / blocks of
flats can benefit from a complete infill of
Technitherm to stabilise the whole wall structure,
replacing corroded steel wall ties and insulating the
walls in one application. Technitherm also eliminates
damp and condensation issues from occurring both inside
the cavity and protects the inner leaf.
Based on a standard brick to block cavity
cavity wall insulation foam is injected though very small
holes in a liquid form, and then, within seconds,
expands to the required thickness, setting rapidly into
a rigid foam form. This creates a continuous membrane,
filling in all gaps, also eliminating draughts and
further possibilities of conducting cold air.
The effectiveness of cavity wall insulation is judged and
measured in terms of 'u' values. Polyurethane cavity
injection foam insulation has extremely good 'u ' values
or thermal efficiency. For example, when comparing PU
foam to 'Rockwool', three times the thickness of
'Rockwool' would be needed, compared to foam, to achieve
an equivalent 'u' value. If a cavity of say, only 2
inches is present, but a u value that only cavity
insulation injection foam can achieve is required, the
foam is the obvious choice.
> Cavity wall foam insulation datasheet (Technitherm)
> See Technitherm being applied (link to video)
Other benefits associated with cavity insulation
injection foam are as follows:
Reduces temperature extremes, i.e. it helps to
prevent environments being too hot or too cold.
Reduces noise and vibrations, such as those given
off by stereos and televisions close to the parting
wall of a semi detached house for example.
Helps to stabilise the two parting walls in a semi
detached house for example.
Can reduce condensation.
Is very long lasting.
Performs in damp atmospheres as it has a closed cell
structure, which means it is almost waterproof.
Does not get damp rotten and smelly if it is exposed
Is compatible with electric wiring, there is no
adverse reaction, unlike Polystyrene.
The combined effect of all these factors and benefits is
making cavity insulation an increasingly popular choice
generally, especially in relation to the current
concerns over climate change, energy saving strategies,
frequent fuel crises and price rises. It was recognised
that thermal insulation can play a key role in the cost
effective reduction of carbon dioxide emissions in
Europe and saved around 350 MILLION TONNES per annum by
application of cavity wall insulation PU foam isn't
recommended to the amateur. It is only really
successfully applied and gauged by skilled engineers.
By choosing Websters Insulation Ltd, you will gain the added advantages
associated with a long established firm, who pride
themselves in being a Yorkshire based organization,
offering quality of service and workmanship, at very
Websters Insulation has been going for over twenty five
years and have been offering cavity insulation for over
ten years, specialising in the application of cavity
insulation for all kinds of structures and buildings,
i.e., industrial, commercial, domestic, agricultural as
well as marine.
Cavity foam insulation is a suitable insulating material
for more or less any requirement. The PU cavity foam system
is the only method approved by Websters Insulation Ltd,
because the continuous membrane adheres to almost all
surfaces, and contains the most efficient insulating