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I wish to deposit 2 interior doors and replace them by 1 door, because I transform 2 rooms into one. The empty space left by the 2 doors must be filled. What precautions should I follow when laying the new door and filling the rest of the "empty" around this door and with what materials?

The best is to make a circle of plaster or cellular concrete, then to mount a framework (sleeping) frame.

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