I have a barn where the aluminum roof has detached from the rafters (I think that's what they're called), it's secured to the battens where it's screwed, but has detached underneath, so to speak. Anyway, I would need farm screws that are about 12cm long in aluminum or stainless steel. Are they available? Or is there a similar screw that I can put a washer on that could work? It's only in a few places, but I might need about 50 screws...
