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I want to make a mezzanine. I have 3,20m of wall to wall. What size of beams to support a light wooden floor and children's rooms (2)?

A classic 80x200 mm bastair frame installed on edges spaced 40 cm apart, with fixings by fixing or galvanized shoes depending on the nature of your wall should be sufficient.

However, always take the advice of a professional before the implementation of such a structure for obvious security reasons. It is not possible at a distance to appreciate the actual load that will be borne, nor the quality of support of the masonry. The information given here is therefore without reservations and without commitment.

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