I'm getting ready to mount some panels on a motorhome roof that seems to have only 1/4" plywood decking, with a small radius. Will be mounting them lengthwise down the center of the roof. 3 x ~30" x ~50" panels, mounting between A/C and vents, so not exactly a continuous line of panels.
Trying to keep weight and profile down as much as possible, I was planning on using 2 x 48" 13/16" unistrut along the length of the each panel, with Z brackets mounting the panel to the unistrut, spreading pull on the brackets over the unistrut, and hoping to overlap a roof truss or two so I wouldn't have to rely on just the thin decking. Unfortunately, it looks like there are spans larger than 48" on the roof where there are no trusses spanning side to side.
I'm entertaining the idea of just relying on butyl tape and 8 or so screws into the 1/4" decking over the length of the unistruts to hold, though I'm thinking it's probably a bad idea.
Anyone run into this? Should I just get 10' unistrut in order to span some trusses and deal with the extra weight, or is screwing to the decking alone enough?
Trying to keep weight and profile down as much as possible, I was planning on using 2 x 48" 13/16" unistrut along the length of the each panel, with Z brackets mounting the panel to the unistrut, spreading pull on the brackets over the unistrut, and hoping to overlap a roof truss or two so I wouldn't have to rely on just the thin decking. Unfortunately, it looks like there are spans larger than 48" on the roof where there are no trusses spanning side to side.
I'm entertaining the idea of just relying on butyl tape and 8 or so screws into the 1/4" decking over the length of the unistruts to hold, though I'm thinking it's probably a bad idea.
Anyone run into this? Should I just get 10' unistrut in order to span some trusses and deal with the extra weight, or is screwing to the decking alone enough?