trammayo
Interested in vintage commercial vehicle, trams, t
Won't you have an expansion problem on the few hot days with the ali roof? - Thinking of how to seal it and not have the screws forced out by expansion.
Anything is possible - that why the joint seals on the original plywood failed (humidity expansion let moisture in). I am going to use Pu sealant adhesive - ordered and delivered next day to my son's - Hermes eat your heart out. This stuff sticks like the proverbial to a blanket. It is also very elastic. As the roof will be covered by six sheets, there should be some slight room for thermal expansion (said he hopefully). Having said that, the ply will shrink and the aluminium will expand!
The screws will be large wafer head self-tappers down the central spine (wood) of the roof and further strategic metal framed points. It will form its own bead over the sides of the trailer (well, it will when I beat it) and these will be screwed down also to keep the ply from curling up.
However, having been wrong many times before, I have a fifty-fifty chance! I was just thinking of my experience with bus panelling on wood and also metal framed bodies.