Insulation under bath tub?

darknite

darknite

darknite

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I think this question was asked recently but I can not find the post, though I have not searched very hard!

However I was thinking this would be a good idea, to keep the bath warmer for longer, and retain a bit of extra heat in the house.

What would you pack out the empty space with? I was thinking just loft insulation, but doing a bit of googling says not to use fibreglass and use insulating foam? My bathroom is upstairs, in a 4 year old house. The bath is not against an outside wall, and is not sitting on a concrete floor. Sooooo do you guys think loft insulation would be ok? Seems like a cheap home improvement. The wife loves long baths and i would love it if she did not need to top up the hot water so often :-)

Would the space blanket insulation be better? The fibre glass is enclosed etc

Could be a stupid idea. All opinions welcome.
 
In the grand scheme of temperature fluctuation over a 30 minute bath, I can't see this having any tangible benefit whatsoever, apart from lots of faff.

Although how about wrapping the bath itself in tinfoil ? :D
 
Could be interesting! Though something foamy would be easier to install. But it seems fairly simple to do at a cost of £20 plus a bit of time to remove the bath panel and shove it in
 
With modern baths being plastic i'd have thought you'd be losing far more heat from the waters surface than from the bath itself. But it's probably worth a ago for the price.
 
What about choice of insulation though? Space blanket or normal fibreglass? Happy to give this a go and see if it helps. But don't want to do it twice if the material is a bad idea!
 
Normal fibreglass will be fine unless it gets wet which it Shouldn't! Stuff the entire space and then put the side back on!
 
Heat rises?

If you've spent much time in a hot tub in cold weather you'll know the most effective way to keep the water hot is to;
a) leave part of the lid on to stop the heat escaping up
b) don't overdo the bubbles\air.

I.e., insulating sides\bottom would have a VERY limited effect (IMO)

Perhaps a crazy amount of bubble-bath creating a layer of insulation above the water's surface is worth trying. I mean, who doesn't like bubbles :D
 
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You can buy polystyrene tubs/liners to put your bath in I’m assuming this is for insulation as well as distributed support. Whilst the top will lose at the greatest rate the underside is a lot of surface area so there will be some loss.
 
I filled the space under our tub with a couple of old synthetic duvets. I can't say it's made a noticeable difference as I don't spend long soaking anyway, but it seemed better than just throwing them away.
 
Rock wool to fill the voids under and around.

It will make a small difference and for the £15 or so it costs worth a go

My insulated wine cooler makes a big difference at keeping things cold and that has no lid
 
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