I'm looking at options for the gantry part of a RoR shed conversion but I don't know how to compare them.
"I did this, that or the other" seems to be very hit and miss and I'd prefer a more engineered approach. For example, John Stephen Hicks rolls a 16ft roof on a double 2"x6" top plate sitting on a 2"x8" joist with a mid support while SkyShed uses a single 4"x4" spruce beam with just the end support.
I'd also like to at least consider options less prone to warping like glulam, steel, aluminium or any other suggestions.
My shed is 4mx3m (10' x 14') and the roof assembly weighs 146kg (322lb). I haven't decided if I'm going to roll off the full 4m or just 3m (leaving the roof over the warm room).
I'm leaning towards gate roller and track. Are there any pros/cons of 'U' vs 'V' profile ?