ohuk Posted May 31, 2021 Share Posted May 31, 2021 My bedroom is bloody freezing and one can feel draughts around the perimeter of the room, and to move the location of the nov bigger radiator I opened the floor up as you can see here. This is a 3rd floor flat built around 20 years ago. What is the purpose of putting very thin insulation on the concrete floor, then the floor joists, and finally the flooring, leaving a big and draughty void directly underneath the flooring? All this does is prevent me from benefitting from rising heat from the neighbour below, it does absolutely nothing to keep the floor warm? If I were to shove additional insulation under here will I later have problems with dampness...? Link to comment Share on other sites More sharing options...
scottishjohn Posted May 31, 2021 Share Posted May 31, 2021 you should asking where the drafts are coming from to start with +seal them up Link to comment Share on other sites More sharing options...
TonyT Posted May 31, 2021 Share Posted May 31, 2021 MAybe the designer or builder thought it might help with noise? Link to comment Share on other sites More sharing options...
TonyT Posted May 31, 2021 Share Posted May 31, 2021 Do you plan to lift the whole floor in the room? Link to comment Share on other sites More sharing options...
ohuk Posted May 31, 2021 Author Share Posted May 31, 2021 5 minutes ago, TonyT said: Do you plan to lift the whole floor in the room? I wasn't planning to do so, just a strip along window, that floor is nailed and how horrible it is to pull those, and it's glued... Link to comment Share on other sites More sharing options...
ProDave Posted May 31, 2021 Share Posted May 31, 2021 Inter-floor insulation between flats is not going to be the cause of cold draughts. Your issue lies with the walls and their insulation and detailing. I strongly suspect what has been discussed lots of times that you have a "plasterboard tent" What I mean is the walls are poorly detailed, there are cracks or poorly detailed openings that allow cold air to bypass whatever insulation is in the walls. This cold air can move around between the wall and the (presumably) dot and dabbed walls and the cold air is emerging at the wall / floor junction. Short of stripping the walls bare and detailing properly the best short term cheap fix is to dry sealing up all the cracks at the wall / floor junction. Link to comment Share on other sites More sharing options...
TonyT Posted May 31, 2021 Share Posted May 31, 2021 If you aren’t going to lift the whole floor, stuffing insulation next to the radiator isn’t goi no to solve the problem 1 Link to comment Share on other sites More sharing options...
tonyshouse Posted May 31, 2021 Share Posted May 31, 2021 I think that the insulation under the floor was intended as sound insulation. Link to comment Share on other sites More sharing options...
nod Posted May 31, 2021 Share Posted May 31, 2021 (edited) It can only be for sound Edited May 31, 2021 by nod Link to comment Share on other sites More sharing options...
SteamyTea Posted May 31, 2021 Share Posted May 31, 2021 (edited) 25 minutes ago, ohuk said: If I were to shove additional insulation under here will I later have problems with dampness Can't answer that directly, but my timber framed house has some small air vents at first floor level. Not sure where they vent to from outside as not had to lift floor boards. I assume they are there to help with moisture control, but not thought about it too much. But now, my idea of externally insulation the place is going to play on my mind, as they vents will vet covered over. Edited May 31, 2021 by SteamyTea Link to comment Share on other sites More sharing options...
ohuk Posted June 1, 2021 Author Share Posted June 1, 2021 15 hours ago, ohuk said: I wasn't planning to do so, just a strip along window, that floor is nailed and how horrible it is to pull those, and it's glued... Link to comment Share on other sites More sharing options...
ohuk Posted June 1, 2021 Author Share Posted June 1, 2021 Just now, ohuk said: Somebody already has had the expanding foam idea, presumably this is not the best way of fixing it... Link to comment Share on other sites More sharing options...
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