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Floor repair after leak (Read 3511 times)
TrevorP
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Floor repair after leak
Dec 9th, 2016, 4:01pm
 
We recently had an underfloor leak from central heating pipe, fault found, floor potion dug up and pipe repaired. The pipes were covered in a very coarse sand with loads of "shiny flex of material" added, then a 50mm layer of concrete and then 20mm of asphalt, for the damp-proof, I assume.
My question is what should I use to repair, would just a plain coarse sand mix over pipes, then a sand and cement mix with a waterproof adaptive in on top, as the damp-proof be ok?

I have never seen the material they used to cover the pipes before, it was almost a grit type, any ideas what it was?

Hope someone could advise how I should fill this hole.
Thanks
Trevor  
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woodsmith
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Re: Floor repair after leak
Reply #1 - Dec 10th, 2016, 7:55am
 
Are the pipes copper or plastic?
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londonman
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Re: Floor repair after leak
Reply #2 - Dec 10th, 2016, 10:06am
 
I think that your 'shiny' stuff is vermiculite or some such.  It's often used as an insulation material and in the case of UFH pipes, protects the pipes from the concrete/cement/screed.
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TrevorP
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Re: Floor repair after leak
Reply #3 - Dec 10th, 2016, 1:50pm
 
They are copper pipes, and was going to wrap in Denso tape and cover as previous posts.
Vermiculite, can you still get this stuff?

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woodsmith
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Re: Floor repair after leak
Reply #4 - Dec 11th, 2016, 7:41am
 
Yes, you buy it in bags from any decent builders merchant
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TrevorP
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Re: Floor repair after leak
Reply #5 - Dec 11th, 2016, 12:08pm
 
Hi, thanks for reply, someone has just told me that they use it in garden centres, is this the same as you are talking about?
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woodsmith
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Re: Floor repair after leak
Reply #6 - Dec 12th, 2016, 8:09am
 
Yes it's the same mineral and you can get small bags this way, not sure if it's crushed into smaller granules for gardening use though.
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TrevorP
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Re: Floor repair after leak
Reply #7 - Dec 12th, 2016, 8:43am
 
Thanks woodsmith, I'd never heard of this material before, now to finish the job.
Cheers all
Trevor
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