Darrell,
The roll off roof design I am using is made of 40 mm stainless steel uni -strut as the guides with 30mm wheel bearing as the rollers with spacers .The roof is made out of 20mm RSH box tubing with a 200mm pitch to allow for the rain water to run off as well as condensation inside.
The Uin-strut is bolted to the top plate of the walls which is held down by the wall sheeting which is held by the bottom plate and hoop iron strapping which is strapped to floor and the foundation ,hopefully this will stop mind for going walkabout in high winds across the paddock .
If you want some pic of the uni-strut design let me know and I will take some and post them if you wish to talk to me give a ring on 0412998031
Ian C
