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General: How Can I Insulate Hot Water Pipe Under Hallway Tiles

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- CommentAuthortimbrennan
- CommentTimeJul 29th 2010 edited
I have a hallway with period tiles and the hotwater pipe runs under them to the radiators. I have dug the pipe out by breaking through some sort of concrete stuff and found that it is surrounded by gravel with no lagging. Is this worth lagging? It only is under ground for around 2 meters.

If so just thinking how to lag the pipe whilst providing a solid foundation for the tiles that will be put on top.

Perhaps using foam insulation around pipe and then pouring limecrete over them would be the answer. Any advice would be great. Cheers.
- CommentAuthorDarylP
- CommentTimeJul 29th 2010
Def. worth lagging, or else you are going to waste an awful lot of heat.

Try digging out around and under the pipes, then clad in closed cell foam, Armaflex-type, the thicker the better.
Then cover with a clay pipe, cracked in half along its length, or similar rigid structure.
Try to keep the xxxcrete away from the pipes, are they copper?

Good luck
- CommentAuthordjh
- CommentTimeJul 30th 2010
This is the pipe leading to a radiator in the hall?

Doesn't that just mean you have some UFH as well as a radiator?
- CommentAuthortony
- CommentTimeJul 31st 2010
Its not as bad as you might think -- you could do perimeter or wing insulation instead always assuming the whole lot is ground bearing heat will be stored in the ground then.
- CommentAuthortimbrennan
- CommentTimeAug 3rd 2010
yes pipes are copper.

Pipe leads to several radiators in 2 reception rooms and hallway.

thanks for the tips
- CommentAuthorTimber
- CommentTimeAug 3rd 2010
Get a cat!

Our old cat used to sit over the ran pipes that ran under a small section of our hall. Kept the cat and the floor lovely and toasty warm!

If you have a ground bearing slab, as tony suggests, it is not that bad, all things being considered.

Timber

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