On Dec 20, 12:31*pm, Jim wrote:
I plan to redirect our ground floor front room next year.

Currently, the walls are unplastered, and we've rewired so floorboards
are loose, so any option is possible at this point.

My question is what, if anything to do about draughts from under the
floor.

We live at a T junction, with a road running off our road straight in
front of our house. This road is a bit of a wind tunnel, and the room
we plan to decorate gets the brunt of it.

The house is Victorian, and slightly raised with large cavities under
the floor-boards. There is also a metal decorated air-grill at the
front of our house which ventilates the space under this room.

Net result is that it is seriously cold and draughty at the moment,
and I can feel quite strong cold draughts if I put my hands over the
floorboard gaps in this room.

When we've decorated the room, I plan to get an underlayed berber
style carpet, which should prevent the draughts, but I'd like it to be
as cosy as possible for my children.

Is there anything else I can do to improve insulation/carpet warmth?

I presume blocking up the air vent completely would be a bad thing? Is
it worthwhile attempting any other sort of under-floor insulation?

Thanks for your input.

If you can get under your floor I would insulate between the joists
with rigid foam boards, stuck in with foam. (Cut them undersize,
support with temporary nails & fill the gap with the foam) You must
fill every little gap.
If you have to lift the boards, they never go back the same, may will
get broken and the edges damaged so you may as well replace them. New
T&G i floorboards are available but expensive. There is special T&G
chipboard for flooring, thats what I have used. When complete go round
the floorboard/skirting gap and fill up with canned foam.
Don't block the air vents it encourages rot.