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We have removed a staircase and we want to close the old stairwell; we will put rafters with hooves but to replace the floor we do not know what to choose we are offered Isorel plates or CTBH or OSB plates, knowing that there will be a part of the apartment. Which solution offers the most security.

The Isorel is obviously top slim for what you want to do. However, particle board (CTBH), OSB, or plywood (CTBX) or medium are ideally suited, in a minimum thickness of 19 mm.

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