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.