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Zenjamino10 May 2021 19:14Hello everyone,
My basement contractor was kind enough to insulate the entire basement, including the part above ground, with 20cm (8 inches) perimeter insulation boards (bitumen adhered) and pre-installed the anchors. The boards are Ravatherm RTXP309SI, which cannot be plastered directly due to their surface. My question is whether we can roughen the boards and then apply a standard plaster finish. Another option would be to remove all the anchors, scrape off 5cm (2 inches) of the boards, then install 5cm (2 inches) of suitable insulation on top and re-anchor.
The basement area is located on the north side.
I find a complete removal and proper insulation with the correct boards not very practical given the current crisis. Of course, the plasterer cannot guarantee the finish, but I could live with that—no risk, no fun.
What are your experiences with such a situation? This concerns only one side of the basement in a house that is 9.33m (31 feet) wide.
My basement contractor was kind enough to insulate the entire basement, including the part above ground, with 20cm (8 inches) perimeter insulation boards (bitumen adhered) and pre-installed the anchors. The boards are Ravatherm RTXP309SI, which cannot be plastered directly due to their surface. My question is whether we can roughen the boards and then apply a standard plaster finish. Another option would be to remove all the anchors, scrape off 5cm (2 inches) of the boards, then install 5cm (2 inches) of suitable insulation on top and re-anchor.
The basement area is located on the north side.
I find a complete removal and proper insulation with the correct boards not very practical given the current crisis. Of course, the plasterer cannot guarantee the finish, but I could live with that—no risk, no fun.
What are your experiences with such a situation? This concerns only one side of the basement in a house that is 9.33m (31 feet) wide.
It is absolutely no problem; just roughen up the boards well with a plaster rasp. There is no difference compared to boards that have a honeycomb structure!
More important than the surface is actually the adhesive, so that the boards do not shift even slightly in heat and cause the plaster to crack. Otherwise, you would need to use special steel reinforcement.
More important than the surface is actually the adhesive, so that the boards do not shift even slightly in heat and cause the plaster to crack. Otherwise, you would need to use special steel reinforcement.
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Zenjamino10 May 2021 20:36Yes, and this is most likely where the problem lies: they were glued with bitumen adhesive. However, thank you for confirming that roughening the surface is feasible. They installed six anchors per panel, so I find it hard to imagine there could be much movement, especially on a north-facing wall, which hardly ever receives direct sunlight.
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