If anyone has similar problems here is a link to some very useful
information.

http://www.insulateonline.com/pdf/Wh...-Min%20Fib.pdf

Guess it was a pity she had the cavity walls insulated in this way.

Kingspan's ( never previously heard of them ) website also has lots of info
regarding remedy.

ItsMe


"ItsMe" wrote in message
...
Hi folks,

My recently deceased mother in laws house is in the process of 'being
looked at by me' and due renovation.

A few years ago she had a grant for cavity wall insulation ( CWI ) and it
was installed ( 82 yo and disabled ).

The installation used a blown in mineral wool type of insulation.

The property is about 100 years old.

On the front wall about 5 feet above ground level there is internally a
damp patch prevoiusly not identified - behind furnishings - and it's not
drying out. There are a few other damp patches here and there above the 1
metre damp proof course fault boundary. Possibly external mortar pointing
also.

External mortar pointing/gutter downpipe leak in that area of the wall was
found to be substandard and is now fixed - but it's still not drying out
after 3-4 weeks.

What is the possibilty that the mineral wool insulation has become sodden
in the area and - given the lack of ventilation in the cavity due to CWI -
will take an age to dry out.

Today I have drilled the damp wall in 2 places from the inside to try to
recover some insulation to test for soddenness - can't recover any
insulation to test - just couldn't hook it out.

Maybe I need to remove a brick on the inside to gain access.

Is the mineral wool insulation they use water repellant or can it become
sodden and retain the dampness for long periods.

What are the implications for other external walls in the property being
that I've identified several areas externally where pointing is
defficient.

I have nightmares of sodden CWI in various pointing deficient areas that
would be verry difficult to fix without removal of the CWI.

Should mineral wool CW insulation actually have been used in this
situation where external pointing was in some need.and would have been
obvious at the time it was installed.

I know there are other possibilities for the damp in other areas but in
THIS area the wall above is not damp.

How to fix it - thats the question.

Recommendations welcome.

TIA - It's me