Help appreciated.
I have a concrete sectional garage, with steel roof frame. Cement sheet roof is well past its best, so I have bought corrugated steel sheets to replace it with.
It came with hook bolts, but the mouths of the hooks are too narrow to hook around the steel frame purlins.
So I am considering self-drilling (rubber-washered) screws.
Good or bad idea?
Screw through crowns, or troughs? (I've seen both methods advised).
I was thinking of putting treated 1" x 1 1/2" timber strips between the purlins and roof sheets, to keep the two metals separate, and delay rusting through.
Thanks in anticipation.
I have a concrete sectional garage, with steel roof frame. Cement sheet roof is well past its best, so I have bought corrugated steel sheets to replace it with.
It came with hook bolts, but the mouths of the hooks are too narrow to hook around the steel frame purlins.
So I am considering self-drilling (rubber-washered) screws.
Good or bad idea?
Screw through crowns, or troughs? (I've seen both methods advised).
I was thinking of putting treated 1" x 1 1/2" timber strips between the purlins and roof sheets, to keep the two metals separate, and delay rusting through.
Thanks in anticipation.