On Jul 6, 7:46*pm, "JimM" wrote:
Hi all

Been think about getting our cavity walls insulated for a while and tonight
we got a knock on the door from a company that is doing this.

They gave all the spiel about government grants etc and end result is that
they will do the 3 exterior walls for 149. I'm very tempted but before I
give the final go ahead are there any pitfalls I should be aware of when
having this work done. Also has anyone had any experience of 'Insulate Your
Home Ltd' they trade as 'Ecologistics'

In case it matters we're a 1970's end of terrace 3 bed house in Surrey

Thanks

Jim

You should have done this years ago.
There are several systems. some had major problems years ago (eg
release of formalin gas into the house from a foam based system.)
However these are all sorted now, most firms use blown mineral fibres.
The fibres are treated with a water repellent.

The main thing with your house is to make sure you are not suffering
from impending cavity wall tie failure the fibres can make this worse.
1970s is a bad time for this, they used wire ties at that time.
The main clue is horizontal hairline cracks in the outer brickwork
(aprox 18"apart.)

The other thing that can go wrong is incomplete fill due to not enough
fibres being blown in.

Ideally the wall should be checked for cavity bridging (cement
droppings on the ties) as when filled with fibre this can lead to damp
spots. This fault is however quite unsual with a house your age.
But afterwards, watch for any damp spots,they may have to come back &
remedy this.