Jim wrote:
On Dec 20, 4:49 pm, The Natural Philosopher
wrote:
Mike Tomlinson wrote:
In article
ps.com, Jim writes
I presume blocking up the air vent completely would be a bad thing?
Yes. The airflow prevents the joists from rotting. Don't do it.
Is
it worthwhile attempting any other sort of under-floor insulation?
No.
yes.

lift boardsd, fit celotex/kingspan between, foil tape over the whole
lot, refit boards.

result no draughts and about 5 times better insulation than carpet.

How thick is a layer of celotex/kingspan? Also, what do you mean by
foil tape?

variable. Suggest 50mm minimum.

Celotex is foill faced, you buy Al. tape to go over the board face and
the joists its wedged between. Makes a contonuous draught and vapour
barrier.