Cavity wall insulating.

[flobadob]

Posted in Home&Garden with no joy last week. Does anyone know anything about this?
http://www.theanswerb...n/Question904200.html

[Old_Geezer]

I suspect the question needs too much expertise in too narrow a subject for many to be able to contribute.

Suggest checking what you can on the Net using the search engine of your choice, and then deciding to pick one and take a chance.

[buildersmate]

Ask each of what the thermal conductivity of their insulation is. Should confuse them/ test them.
Phenolic foam (Celotex / Kingspan) is around 0.020W/mK. High is bad.
I would expect the products that get injected into walls to be similar.
Very doubtful that spending £200 more gains you very much - but you didn't say whether it was £200 in £1000 spend or £200 in £2000 spend.
I'd be more concerned about the quality of the workmanship - do you trust them not to trample all over your flowerbeds and to properly fill in the little holes afterwards without leaving an unsightly mess.

[flobadob]

One is £1150 and the other £1350. I think they are both reputable enough firms as they are both registered.

[buildersmate]

Then go for the cheaper one.