Plastering over plastic C/H flexi pipes

Plastering questions and answers here please

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Froggie66
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Plastering over plastic C/H flexi pipes

Post by Froggie66 » Fri Sep 14, 2018 5:33 am

My son has all his c/h flexi pipes chased into the wall and then plastered over.
The original builder did a good job as no cracking or visible marks where the pipes are.

The question now is that he is to have a radiator moved and again the pipes will be chased into the wall.

I am happy to fill/skim over the pipes but want to know from the experts how to do this without
plaster cracking so that they remain as invisible as the original ones were.

Please no suggestions such as why move radiator, I am after serious advice only please
as this is what he wants and hence your guidance needed.

many thanks

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Re: Plastering over plastic C/H flexi pipes

Post by wine~o » Sun Sep 16, 2018 6:50 am

how deep are the pipes ?
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Re: Plastering over plastic C/H flexi pipes

Post by Froggie56 » Sun Sep 16, 2018 6:54 am

Thanks for asking.

I would guess the top of the flexi pipe is approx 10mm from the wall surface,
so therefore original the depth of the channel was approx 25mm.

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Re: Plastering over plastic C/H flexi pipes

Post by Froggie56 » Sun Sep 16, 2018 6:57 am

P.S. You replied also to a posting I made some time ago

post708125.html#p708125

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Re: Plastering over plastic C/H flexi pipes

Post by wine~o » Sun Sep 16, 2018 7:20 am

Whenever I have done similar (though copper not plastic) I have used expanded metal lath

https://www.screwfix.com/p/sabrefix-bri ... GwodTIcEHw

Is one example over the pipes before filling, however I can't be certain that it will work if the pipes are only 10mm below the wall surface, I tend to bury the pipes a bit deeper 20mm or more below the wall surface.
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Re: Plastering over plastic C/H flexi pipes

Post by Froggie56 » Sun Sep 16, 2018 8:48 am

That aside.

Did you the use Thistle boding plus topcoat or Just EasiFill the lot?
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Re: Plastering over plastic C/H flexi pipes

Post by wine~o » Sun Sep 16, 2018 9:01 am

Just normal finishing plaster, built up in 2/3 layers.
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