Using the partial floor plan below and the following given information, what is the

supported length for FLOOR BEAM $-$ FB$1?$ All stated values and dimensions are in

millimetres.

Exterior dimensions to outside face of wall sheathing

Interior dimensions to centre of wall or beam

Exterior walls have $38$ xx$140$mm wood stud framing with $13$ mm plywood sheathing

Interior walls have $38$ xx$89$mm wood stud framing

$4115$mm

$4255$mm

$8510$mm

$4090\mathrm{.}5$mm