?hi, I need to provide structural calcs for a glass roof that we are fitting to an extension. The area is approx 4.5m2 and the weight of the glazing will be 31.2kg m2. It will a "lean to" style with the rafters supported by a 100mm cavity block wall at the eaves end and joist hung off a joist bolted to another 100m cavity block wall at the other.
Does anyone know how to calculate what size timbers (@ 600 centres) would be needed to safely carry this load and what figures I can show to building control to satisfy their conditions.
Dont really want to elist the services of a structural engineer as just had to pay them £250 for calcs for 3 steel beams.
Thanks in advance