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Insulation under my bath?

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Hi, live in a small old non cavity wall terrace. Bathroom is by a mile the coldest room in the house. Under the bath I can see floorboard and the bare wall for on end of the bath. Any advice? Want to … Read More
ijw0161 Avatar
5m, 6d agoPosted 5 months, 6 days ago
Hi, live in a small old non cavity wall terrace. Bathroom is by a mile the coldest room in the house. Under the bath I can see floorboard and the bare wall for on end of the bath. Any advice? Want to fill everything ideally, but not with something that might promote damp. Someone said put loft insulation under. Or even fill bin bags with it and stuff them under?
ijw0161 Avatar
5m, 6d agoPosted 5 months, 6 days ago
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Best Answer
Don't use plastic bags of anything, or anything plastic- it will sweat and cause damp.
Polystyrene slabs are a good base and loft insulation for odd shapes, but remember to leave some air spaces.

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Responses/page:
#1
fill some of the holes with a thin layer of expansion foam to keep the cold out then fill with insulation
#2
Fill any holes under around walls with expanding foam. Cheap enough for a tin. Not heard of anyone packing out with insulation though
#3
don't use expanding foam just use loft insulation ( I am a builder).
to be honest you probably won't notice any difference. having a solid wall with no cavity is why the heat escapes so quickly.
#4
I'd go with loft insulation as well rather than expansion foam. you could build a small cavity from a wooden frame and insulate that but it's a hassle and means you'd have to decorate
#5
I stuffed my old hot water cylinder jackets under the bath when I got a new boiler. Made a massive difference in terms of noise, cant say it was cold before but it must keep the bath warmer longer and cut out drafts.
#6
With it being terrace, I am assuming mid terrace, so in terms of lack of cavity, it's only one wall that's the issue right?

Is there air bricks on the outside of the property bringing air under the bathroom floor?

Is it more a heating problem, rather than a lack of insulation? How do you heat the room?
#7
One thing to keep in mind is if it is that cold, there will probably be condensation on the hot water pipes under the bath (if they go under it). If they are in contact with the insulation material you use, it could get damp from that I would imagine?
#8
Robj1
With it being terrace, I am assuming mid terrace, so in terms of lack of cavity, it's only one wall that's the issue right?
Is there air bricks on the outside of the property bringing air under the bathroom floor?
Is it more a heating problem, rather than a lack of insulation? How do you heat the room?
Yes just the top of the bath is up against the outside wall. Radiator is pretty new, not a problem heating the room, you can just tell loads of heat is being lost
#9
ijw0161
Robj1
With it being terrace, I am assuming mid terrace, so in terms of lack of cavity, it's only one wall that's the issue right?
Is there air bricks on the outside of the property bringing air under the bathroom floor?
Is it more a heating problem, rather than a lack of insulation? How do you heat the room?
Yes just the top of the bath is up against the outside wall. Radiator is pretty new, not a problem heating the room, you can just tell loads of heat is being lost


What type of extractor do you have in the room, if any?
#10
Don't use plastic bags of anything, or anything plastic- it will sweat and cause damp.
Polystyrene slabs are a good base and loft insulation for odd shapes, but remember to leave some air spaces.
#11
Robj1
ijw0161
Robj1
With it being terrace, I am assuming mid terrace, so in terms of lack of cavity, it's only one wall that's the issue right?
Is there air bricks on the outside of the property bringing air under the bathroom floor?
Is it more a heating problem, rather than a lack of insulation? How do you heat the room?
Yes just the top of the bath is up against the outside wall. Radiator is pretty new, not a problem heating the room, you can just tell loads of heat is being lost
What type of extractor do you have in the room, if any?

No extractor but we have the window open for baths and showers. And leave it open till the room has dried

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