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I want to build a lean to Gazebo covered with Polycarbonate roofing. Dimensions are 5 metre long by 3 metres wide. It will be attached to the back of my house. ( Brick ( veneer I think is the correct term. ) I have sketched out 3 100x100 posts. One on each corner. Rafter spacing.8 How close do my purlins need to be? How many for a 3.0 metres span?. I would attach a ribbon board or ledger to the side of the house. Would .120 by .40 be strong enough? The soffit is .6 do you think I need to put a flashing over the end by the ledger board? If I use 120x 40 ledger would I use dyna bolts to hold to the brick or are anka or Ramset fittings be enough and how far apart should I put these What size
? What dimension timber would I need for rafters and purlins? Would 1cm every meter give enough fall for pitch. Will be 2.1 at highest point.
