I'm looking for some help with deciding which insulation type to go for in our sitting room.
It was formerly half a double garage and was converted a few years back - but the subfloor consists of 47 x 100 bearers (mostly cut to 90mm), no cross pieces, and 50mm polystyrene insulation which has simply been chucked in, gaps everywhere, it is too small for the channels.
It is basically a very cold room. The walls have been done properly I believe, soft blocks and well insulated, so I think the concrete floor and poor insulation is the culprit.
I will be replacing the insulation with something thicker, and have 85mm Celotex in mind.
Would this be a good idea, or would I be better with something else? I don't want to spend a fortune, the room is approx 4.2m x 2.4m.
I also want to put down a DPM for belt & braces as there is nothing there, and it suspect this will help the cold problem a little also. Should I just lap it up the walls to the level of the chipboard T&G?
As a final thing I was going to seal around the room with expanding foam, probably after installing the chipboard, to prevent draughts. Is this advisable? Do I need to leave an expansion gap for the chipboard though?
Thanks in advance for any help, much appreciated...
It was formerly half a double garage and was converted a few years back - but the subfloor consists of 47 x 100 bearers (mostly cut to 90mm), no cross pieces, and 50mm polystyrene insulation which has simply been chucked in, gaps everywhere, it is too small for the channels.
It is basically a very cold room. The walls have been done properly I believe, soft blocks and well insulated, so I think the concrete floor and poor insulation is the culprit.
I will be replacing the insulation with something thicker, and have 85mm Celotex in mind.
Would this be a good idea, or would I be better with something else? I don't want to spend a fortune, the room is approx 4.2m x 2.4m.
I also want to put down a DPM for belt & braces as there is nothing there, and it suspect this will help the cold problem a little also. Should I just lap it up the walls to the level of the chipboard T&G?
As a final thing I was going to seal around the room with expanding foam, probably after installing the chipboard, to prevent draughts. Is this advisable? Do I need to leave an expansion gap for the chipboard though?
Thanks in advance for any help, much appreciated...