I'm going to build a conservatory outside our kitchen extension. It will be a lean-too configuration supported on two sides by the existing house and will be 4m by 3.5m.
I have two design limitations that I can see at the moment. The first is that the gutter height of the house is only 2.5m. To overcome the lack of head room this is going to give, I intend building the frame of 50mm box section galvanised steel. At the moment I can't see any problems with that - anybody got any comments?
The second is that the structure will include two bedroom windows and correspondingly I intend to do the conservatory roof in glass to reduce the light loss from those rooms.
This is where the questions come!
1 Do I use double glazing and what what weight of glass will that involve ?
2 I can calculate the structure deflection but what deflection will the glass tolerate? My current guesstimates of weight show a 2mm deflection on the 3.5m sloping length of the structure (and that includes 3" of wet snow).
3 What angle should the roof be at?
Thanks for any help
Rob