73 D18 roof replacement

[sharon051266]

I have a 1973 Dodge Tioga Sportsman. It has a flat roof that Leaks, it doesn't have any plywood just metal roof, insulation, and ceiling.  Can and put plywood up there if so what kind and how thick?   

[Oz]

Actually, that was common.  Not just for travel trailers, but also for motor homes!  Yes, you can put plywood up there.  You want it to be lightweight, so you can use 1/4" plywood or luan (if you want a finished look without having to sand the plywood finish and deal with the wood knots in it).

[sharon051266]

Can I use R-board on my roof instead of plywood?

[Oz]

If you mean rigid sheating, no.  Use plywood or OSB.  Rigid sheating is the weakest.  You want strength.