Cavity wall insulation

evilgoose

Hi all, I dont know if I'm wasting my time with this train of thought!

I'm having new windows and a set of french doors put in, currently I have a large hole in the side of my house with the cavity wide open.
I very reluctant to go down the route of pumping in insulation and so filling the cavity.
I was wondering if while the cavity is open is it worth my while installing as much sheet insulation as I can into the cavity (whilst maintaining a 3cm cavity) Obviously, its not going to be as effective as the pumped insulation or if it had been installed from scratch - but will it make any difference of am I just wasting time and money?

many thanks,

TroysMum

Definatly wasting your time and money, it would be difficult to maintain your cavity, installing it retrospectively, which if not maintained could cause damp ingress which you definatly dont want. The only way to reduce heat loss retrospectively in cavity walls is to have it blown in. Too many problems may occur doing it any other way.

TroysMum

And you wouldnt benefit much from just doing it in small areas.

Yorkie59

After changing patio doors to french windows to allow wheelchair access to be somewhat easier, and fitting double glazing - I contemplated and discounted a similar ploy. I opted to have the insulation done professionally and as ours is a semi, was pleased to see my neighbours agreed - as did five others in our end of the road. All of us noticed the house is warmer - subjective I know - but with a Gas Boiler out since Sunday morning I was pleased the house wasn't as cold as expected on Monday morning. Agree small scale won't help - you would be better adding more loft insulation, since heat rises, and avoid creating a potential bridge across the cavity.

ormus

we had the the roof done with extra insulation, and the cavity walls done 2 yrs ago. the difference is very noticeable.
when combined with 2 new bay windows and a new combi boiler, our heating bills are down by 30% per annum.

dodgy_damo

Don't know if this has been posted before, but I know that around east London (Newham, Havering,etc) they are offering discounts on cavity wall insulation, loft insulation,etc.
Try this link, http://www.warmzones.co.uk/about_us.html
alsoi try your locaL COUNCILS websites