On 14/06/2018 06:12, harry wrote:
On Tuesday, 18 November 2008 23:56:49 UTC, jim wrote:
On 16 Nov, 17:46, chudford wrote:
I thought that all modern houses had to have cavity wall insulation.

You might do better to concentrate your efforts on upping attic
insulation & look at ways of minimising heat loss in exposed sections
of your house - curtains, carpets etc can all help. Can you mask a
wall exposed to the full force of cold winds so that they are
deflected, eg by repositioning a shed? Consider putting rockwool
insulation between ceiling joists over living rooms. We found that
made quite a difference to comfort in our sitting room.

Blown in cavity wall fibres are silicon coated to make them water repellent.
As are the cavity wall bats.
https://www.nia-uk.org/consumer/unde...-mineral-wool/

That wasn't always so. Newcastle has a problem with rogue cavity wall
installations from about 10 years ago that are still just about under
guarantee failing in large numbers because the fibre method used has
bridged the outer and inner wall causing widespread penetrating damp.

I happened to meet one of the insurance assessors when he was looking at
my brother in law's house. It has wrong method of insulation but so far
doesn't have any obvious signs of water ingress. The guy suggested
moving any furniture backed up against outside walls and taking a look
since the deadline for making a claim was fast approaching.
--
Regards,
Martin Brown