Cavity wall insulation

Klug

Hi all, I have read other posts on this subject but can't find an answer, so am looking for some advice please..

Our house was built in the 1920's and has had cavity wall insulation fitted in the 70's.
Having lived through a few very cold winters with a north facing lounge and bedroom we are thinking that maybe the insulation is deteriorating and/or failing.
Please can anyone advise how we can check this and is it possible to have new insulation pumped over the old stuff to make it good?

Many thanks for any help and I'm sorry if people have answered this before - but I can't find it!

aboard_epsilon

Not sure ..but i think in the 70's cavity wall insulation may have been expanding foam ..

i have a boat that was filled with this stuff in 1977.....it's not there anymore !!!.....this is what makes me think, that a lot of double glazing units are going to be falling out in a few years time.

best way is to take a brick out and check....do it in some unseen place, where there isn't any plaster, like a lean-to coal house or garage .

if it has disappeared ..all you will find is a load of orange dust in the first foot of the cavity

I'm also not sure if houses in the 20's were built with cavity walls.

just found his site ..

http://www.west-norfolk.gov.uk/default.aspx?page=22397

it says cavity walls generally did not come in untill the 30's

and has a diagram

showing how you can tell if you have cavity walls



all the best.markj

aboard_epsilon

Seen clear evidence today ..that expanding foam turns to dust ..there was an old brown wood effect pvc window at the local glazziers that had been just taken out ..the foam that had been used to stick it in, maybe less than twenty years ago ..was still on it ..but half had turned to dust !!!..most crumpled into dust just touching it.

I predict big scandal coming in the future .

all the best.markj

phill99

Cavity walls started being introduced in the 1920's but it wasn't until some time later that it was common place in all houses.

1970's CWI was often polystyrene beads which often blow out through small openings and cracks and often sink to the botom of the cavity.

You need to get into the loft and see if you can see down the cavity.