Non Asbestos Insulation

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Non Asbestos Insulation

Postby Spoog » Tue Aug 28, 2007 4:14 pm

I appreciate this question is of more general application than usual, but here goes..... what could we use to insulate some wiring which runs very close to some central heating pipes? I'm told builders would previously have used asbestolux, but obviously wish to avoid this. The wiring and/or pipes can't be redirected, due to lack of space, so is there a non-asbestos equivalent in use nowadays which would be suitable to put between pipe and wiring? Thanks
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Protection?

Postby Simon TL » Wed Aug 29, 2007 9:42 am

Hi

What are you trying to protect? The pipes from the cables or the cables from the pipes?
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Protection?

Postby Spoog » Wed Aug 29, 2007 11:19 am

Primarily we're looking to protect the cables from the heat of the pipes, hence the "old" asbestolux usage. Is there a non-asbestos tile or similar which can be used for effectively boxing off the cable/ simply putting between cable and pipe run?
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Postby tim smedley » Wed Aug 29, 2007 9:48 pm

Presumably you will be insulating the central heating pipes?

In my experience, once lagged properly to keep the heat in, the remaining heat leakage is nowhere near high enough to damage the cable.
According to http://www.machinist-materials.com/comp ... astics.htm PVC, which is used to protect mains cable, has a melting point of 360 degrees F (182 C) so on this basis you should be OK!
The other reassuring thought is that the designers of mains cable know it will be jammed into gaps between floors & walls, sharing the space with other services - so they will have designed the cable with this in mind.
Hope this reassures. Tim
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Postby James » Thu Aug 30, 2007 10:30 am

On the other hand, the resistance of cable rises as the temperature rises which can cause a further temperature rise within the cable as electricity is drawn. Lagging is important.
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Foam Lagging?

Postby Simon TL » Thu Aug 30, 2007 12:38 pm

Perhaps just use the grey sort of foam lagging for the pipes. Some is blue but the grey is more tasteful.
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Postby Lydia » Thu Sep 06, 2007 2:17 pm

Alternatively, if it's just to stuff out of sight, your good old mineral wool insulation is non-combustible... and if you're really, really worried, there are plasterboard-type boards that offer 30min and 60min fire resistance (and therefore some insulation).

Have a look on the Rockwool, Kingspan or Knauf sites for more info... you could always call up their technical department too for advice.

You didn't mention exactly how close together the wires and pipes are. Personally, I wouldn't go for the foam option here.
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Insulation

Postby Spoog » Mon Oct 01, 2007 5:11 pm

Thanks for all your advice. We are considering the options suggested.
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