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Originally Posted by petertjed  the neighbours wall is 25 cm concrete and the internal wall is 10cm ytong. So do i have to make a space between the existing wall and a double leaf construction or can i use the wall as the first mass? |
You can use the concrete walls as the first leaf.
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On what kind of material should i build the double leaf? So that they don't make contact with the floor?
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Who knows? What materials are cheap in your part of the world? Where in th world are you? What is the floor construction?
Sorry, but with out definite answers, nothing can be written to answer your questions.
Andre