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PostPosted: Fri Jan 11, 2019 7:11 pm 
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Hi all

I'm sorting out the loft in a house I've moved into and the next job is to lag the naked pipes. There's a mixture of 15mm and 22mm.

1. What's the best foam product to use. Some day thick grey stuff is fine, others say to use Armaflex / Tuflex, and that even those won't stop a freeze in the extreme cold (at which times they say you should leave your loft hatch open to prevent freezing)? So firstly, what to buy?

2. If a pipe is clipped to a joist and will be covered by the loft insulation, should I still lag it?

3. Some pipes are clipped to the rafters or are clipped to vertical timbers. How can I insulate them?

4. We've got several outside taps, do I need to insulate the the small amounts of external pipework?

5. Pipes around the house, underfloor boards (some are accessible), not boxed in, etc. Is it a good idea to lag these where possible from an energy saving point of view? I've read that it is, but then I also think they give off heat. So that one's always confused me!

We are in rural Wales and I just want to make sure I get it right first time, so any advice most appreciated. I've also just been reading about trace heaters... Overkill or good idea?

Cheers


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PostPosted: Sat Jan 12, 2019 9:54 am 
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udaman wrote:

1. What's the best foam product to use. Some day thick grey stuff is fine, others say to use Armaflex / Tuflex, and that even those won't stop a freeze in the extreme cold (at which times they say you should leave your loft hatch open to prevent freezing)? So firstly, what to buy?

normal grey insulation tube i fine

2. If a pipe is clipped to a joist and will be covered by the loft insulation, should I still lag it?

Can't do any harm

3. Some pipes are clipped to the rafters or are clipped to vertical timbers. How can I insulate them?

use the same grey insulation tubes, they have a split along the length for installation

4. We've got several outside taps, do I need to insulate the the small amounts of external pipework?

Yes, however you would do better to isolate the water supply to outside taps and leave them open over winter.

5. Pipes around the house, underfloor boards (some are accessible), not boxed in, etc. Is it a good idea to lag these where possible from an energy saving point of view? I've read that it is, but then I also think they give off heat. So that one's always confused me!

Under ground floor then insulate as in extremely cold weather they can freeze due to cold air coming through the air bricks.



We are in rural Wales and I just want to make sure I get it right first time, so any advice most appreciated. I've also just been reading about trace heaters... Overkill or good idea?

Cheers

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