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Can I insulate under my floorboards. Will there be a problem with condensation, what's best to use. thanks

There's a cellar underneath & an amount of pipework & electric cable. Have been looking at extruded polythene board, my house is freezing & no-one will come visit me, not even my kids!! Been bit bothered about the condensation aspect. If I put this board stuff underneath the boards will it prevent the airbricks doing there job. Apologies if you looked at my earlier question, Missed the 110 characters bit, new here. Doug

Asked By: chillybones - 4/21/2008
Best Answer - Chosen by Asker
yes you can insulate under the floor no problem,i have insulated under my floor with 75mmkingspan insulation.i work in the conservatory industry,and when they have bases built with suspended floors i.e. joists,it is a regulation that they must be insulated,they used to use normal glass wool insulation held up with... More
Answered By: dodgyspark - 4/21/2008
Additional Answers (9)
yay!!!!!!!!!
Answered By: plato's cousin - 4/21/2008
 
bah there is a recession on you know. save energy fill up the gaps with old clothes etc and newspapers and anything free and warm. Live like a king
Source(s):
Answered By: GOATY - 4/21/2008
 
i dont think that there would be any problem with condensation. your celler might be more damp though... More
Answered By: insane_mad_maniak - 4/21/2008
 
Try lining the ceiling of the cellar, any thing that will cut draughts will help. You can get plaster board with expanded polystyrene & Silver foil, it's great.
Answered By: ianhad - 4/21/2008
 
i think you can insulate directly under the floor boards providing their is air flow between the ground and the insulation then you should be o.k. with the condensation problem. but you could always check with the local council building department
Answered By: maca - 4/21/2008
 
DO NOT use the extruded polythene board under your floorboards. Go to a home improvement center and explain the 'heat leakage' problem to someone there ... there are several GOOD things you can use, including your basic 'ceiling insulation' under those floor boards. They 'breathe' and the polythene board doesn't... More
Answered By: Kris L - 4/21/2008
 
Condensation occurs when warm moist air from inside your house gets chilled by contact with a cool surface. Ordinarily, we put plastic vapour barrier on the warm side to prevent the moist air from reaching the cooler surface on the other side of the insulation. This is difficult to do in your case... More
Answered By: honeylulu2 - 4/21/2008
 
I had a similar situaton to you, except rather than a cellar underneath, I had a small (1 metre or so) crawling space. The floorboards were wooden planks, so I used thick loft insulation (rockwool or similar). I stapled plastic netting to the floor joists, and used this to support the rockwool. It worked a treat, it... More
Answered By: John J - 4/21/2008
 
"John J" in my opinion has given the best answer. Now my turn..........Don't use poltstyrene foam or styrofoam, as it affects the insulation of electric cable.
Answered By: xenon - 4/21/2008
 
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