I've set up the framework for a conservatory where I plan to have a balcony on top. The rafters are a type of gable roof made of solid K24 45x290mm that have been tapered down to 145mm at the ends. The span is 4.2m, which gives a roof angle of about 4 degrees. Since the angle is so low, the roof is covered with tongue and groove boards and roofing felt. On top of the roofing felt, I plan to lay pressure-treated wedges (4 degrees) which I will then screw 28mm decking into, thus creating a balcony on the upper floor. To achieve a stable deck floor, I'm using 600mm on-center spacing for the rafters and wedges. Now that the roof and felt are up, I feel that it "wobbles" too much (I’ve jumped on the roof to gauge the flexibility).
How can I make it even more stable?
1. Install blocking between the rafters (so far the rafters are only connected with the tongue and groove boards)
2. Install Sigma beams
It's a bit difficult to get proper dimensioning guidance since most examples refer to roofs without a balcony. I've calculated a load of 0.5kN/m2 for the roof and accounted for 1kN/m2 for snow.
Any inputs, anyone?
