I found the sites detailing required sizes of floor joists for MxM size of rooms; but is there similar for supporting these beams in the middle, as in front to back of house is 7m, floor joists are each 4m and meet across a central beam in the middle where the width is 4m.
So width 4m, length 7m divided in two by a supporting beam.
(Which currently is wooden about 6x4, as part of the dividing wall downstairs)
So width 4m, length 7m divided in two by a supporting beam.
(Which currently is wooden about 6x4, as part of the dividing wall downstairs)