Quote:
Originally Posted by snowyskiesau
Pine plywoods are typically 500 - 650 Kgs/cubic metre.
Colorbond steel is between 4.2 and 4.5 Kgs/square metre.
Polycarbonate sheeting is lighter but needs more in the way of a framework to support it.
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Thanks for that info. Polycarbonate roofing sheets seem to be between 1.2 and 1.5 Kgs/M2 for domestic use and depending on brand and thickness. So it's roughly a third to half the weight of colorbond or 7mm plywood.
If you use 2.4 metre lengths to build the frame for one of these things, then the roof will require roughly 5 full sheets of 1.2 x 2.4 length or roughly 12.5 M2 weighing between 15 and 18 Kgs (without frame). If you work with inch box section, you can easily afford to put a bit more support into the panels.
I haven't weighed the steel framework yet but it does seem to me that a full roof for the kit could be made to weight little more than 50Kgs or so. That does seem to suggest that the cantilevered lift-on/lift-off system could work.
Peter