DIY Doctor

Denso Tape Problems Around Central Heating Pipes

Postby csmith848 » Tue Jan 05, 2021 1:54 am

Hi all,
I recently re-did my central heating system and had the 15mm copper radiator supplies put through the wall.

Because there are other problems with damp around the property, I was advised to use cement (rather than bonding) to fill the holes left around the pipes in ground floor walls.

Before doing so, I was also advised to protect the pipes using Denso tape, which I did. However, since then I have discovered Denso should not be used on anything over 55degC and the petroleum in the tape has started to come through the concrete in front of the pipe.

I was planning on using an interior filler to finish off the last few mm of filling before sanding and painting, but I want to make sure the Denso tape won’t cause problems in the future.

Does anyone know of any product/have any advice on how I can seal the concrete to stop the oils from coming through to the finished surface?

Thanks for your help in advance
Attachments
71C7B9D3-514D-483D-9F07-9A2044E6AFD8.jpeg
I know the photo looks like a water leak, which I feared at first, but I have tested and tested and there is zero water dripping from
underneath.
csmith848
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Postby stoneyboy » Thu Jan 07, 2021 6:33 pm

Hi csmith848
Short of digging out the concrete fill and removing the tape I don’t think you will stop the problem, although it should reduce over the years.
Regards S
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Postby csmith848 » Fri Jan 08, 2021 1:53 pm

stoneyboy wrote:Hi csmith848
Short of digging out the concrete fill and removing the tape I don’t think you will stop the problem, although it should reduce over the years.
Regards S


Hi S!
Thanks for the reply.
I guess i’m just going to have to deal with anything that comes through in future :(
csmith848
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