Slider wrote:

How can you tell if a house has CWI? I have a 2001 build (Permisson,
I think) house. How would one tell if it has CWI?

drill a hole in the cement joint and have a poke around.
The hole only needs to be about 5mm diameter, but obviously 100mm deep, and
poke in a piece of wire, a straightened coathanger preferably, and if
there's any sponginess, it's insulated with yellow fibreglass batts, if
there isn't, it may still be insulated with loose fill fibreglass, and to
check for this, add a bit of gob oil to the end of the wire and have another
poke, fibreglass will be white, rockwool will be cement coloured.
If it's insulated with polystyrene or celotex type rigid foam, you should be
able to push the wire into it and you can 'feel' the sqeakiness of it as the
wire goes through, if that makes sense.

I'll wager a pound to a piece of dogturd that it's done with white blowing
wool - I used to do Persimmon homes every Saturday morning for years, and we
used white fibre,.

--
Phil L
RSRL Tipster Of The Year 2008