ᐅ Asbestos cement panels with exterior render

Created on: 26 Mar 2021 07:18
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Matze3184
Hello. I recently bought a house with asbestos cement panels installed on a wooden framework on the facade. Since I want to keep these panels in place because completely removing and re-cladding would be too expensive, I have a question.

Is it possible to cover the facade with an exterior adhesive plaster and then apply a textured or scratch plaster on top? I’m not sure if these panels might shift or move in any way and cause cracks in the plaster later on.
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Matze3184
26 Mar 2021 09:09
Nida35a schrieb:

Not a good idea. The boards will bend between the battens when plastering, causing permanent cracks. Everything is too soft for plaster.

Take off one board—you might find
damaged plaster,
rising damp with efflorescence,
damaged masonry, and other issues
Nida35a schrieb:

Not a good idea. The boards will bend between the battens when plastering, causing permanent cracks. Everything is too soft for plaster.

Take off one board—you might find
damaged plaster,
rising damp with efflorescence,
damaged masonry, and other issues

Unfortunately, there is no masonry behind this construction. Asbestos cement boards, wooden framework, insulation with styrofoam, drywall. That is what the construction looks like.
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icandoit
26 Mar 2021 09:18
Then just leave the facade as it is. Apply a coating and it's done. It's already lasted almost 40 years without any problems.
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Matze3184
26 Mar 2021 09:32
What is the best way to coat this? Since the panels are visible and don’t necessarily look good, the idea was to use exterior bonding plaster to smooth out the edges.
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icandoit
26 Mar 2021 09:44
Weather-resistant cement paint
Get advice on which paint can be applied directly to facade cladding without any preliminary treatment. The paint must create a smooth surface that behaves similarly to plastic. In addition, the paint should, of course, be highly weather-resistant to withstand both summer heat and winter snow.

Feel free to show us your facade.
lastdrop26 Mar 2021 10:18
Uncoated asbestos cement boards must not be painted or coated, as far as I know.

There are also specific regulations for coated ones. Even the necessary cleaning before treatment is complex.
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nordanney
26 Mar 2021 11:57
Matze3184 schrieb:

I only want to know if this method will stick to the wall.
Rendering (plastering) means you must comply with the energy saving regulations – legally, this will most likely require mandatory insulation.

Will it hold? No idea. I would ask a professional, such as a painter or similar.