Fill small nail holes with silicone caulk or roof cement.
Roof repair gap in tin.
In this video i show you a quick way to fix a hole in a tin metal roof that might of been caused by a fallen tree limb.
Repairing a metal roof seam with turbo poly seal is simple and it is a do it yourself p.
Smaller nail holes will be permanently fixed by this method standard roofing nails would be either 3 8 inch or 1 2 inch making a hole.
Apply uniform layer of metal roofing base coat 6 inches each way of the gap at the overlap with a paintbrush.
Both mesh and purlins reduce summertime heat penetration to the interior somewhat but i believe the significant advantage of the more effective ventilation gap provided by purlins is the reduction of the summertime temperature of the metal roofing itself.
I am not a professional roofer but.
How it works the metal retrofit system is installed by filling in the area of the metal panel between the metal ribs with an insulation board.