Hi,
I am about to renovate an 1890 end terrace house and have read lots about cavity wall insulation and from previous experience I would prefer to leave the cavity empty so am looking where else I may be able to counter this. The ground floor has a decent void underneath and I was wondering whether there is any advantage or disadvantage to fixing kingspan/celotex between the joists or would it be better to insulate on top of floorboards before carpet/wooden floor goes down.
Secondly I intend to retain old sashes and want to draftproof them. I understand that if i remove the openers i can route a groove and fit a draft strip. Any tips on this, where can i buy the draftstrips and is there any system that is particularly good.

Thanks

Hugh

Mightn products and Readiseals both supply sash window brush seals etc.

You could also take a look at http://www.buildingconservation.com/articles/sashwindows/sashwindows.htm also http://www.sash style.co.uk/parts.php Mighton have video clips on their site