Q1. Do calculations to check whether the SG8 300mm x 50mm (i.e. 280 x 45mm) floor joists at the mezzanine level, spaced 300mm apart, have adequate stiffness to limit the sag to L/300, due to a uniformly distributed line load (for the mezzanine storage level), w, for G+Ψ_lQ, of w = 1.5kN/m. Treat the floor joists as though they are simply supported with a length of 3.0m (and moisture content is 15%). In addition, assume that the plywood sheeting means that the floor joists displace together (and so you can use average modulus of elasticity, E’). Report the ratio of the displacement demand to the displacement limit in %.