"fred" wrote in message ...
In article , Geoff Pearson
writes

Second question: how to do it? I can put mineral wool rolls in the space
and hold it in place with netting. Or should it be slabs of something?
Do
I need vapour barrier - I think not?

This has been done to death on uk.d-i-y over the years and the advice
given is still valid, can I suggest you have a search on google groups
group:uk.d-i-y and come back with questions on anything not covered there.

With bills that high I assume draughts are a more likely source of your
heat loss. Floor insulation can generally be assigned a lower priority but
you usually end up fixing floor draughts at the same time. For info, a
draughty 5mm gap between floor and skirting on a good sized Scottish
lounge room is equivalent to having a window open 100mm. How draughty are
your windows? Also, tenement or proper house, it makes a difference.
--
fred
it's a ba-na-na . . . .

Actually, insulating an "Edinburgh" floor does not seem to be covered much
elsewhere. English suspended floors seem to be joists and planks and nowt
else so there is a lot on them. There are drawings like my house on on
http://www.changeworks.org.uk/upload...ge_online1.pdf (page
39 et seq).


It is a mid terrace house, two storey, with virtually air-tight windows
(brush strips etc), doors likewise, so the remaining obvious air entry
points are though the floor (sanded bare boards with rugs). Skirtings have
mouse-mouldings so they are sealed. Many of my neighbours have full
basements which are semi-habitable rooms. The ground rises slightly under
mine so the room shapes are there but not the height.