How to hold down sheet metal roofing that runs out past the roof?
Hi,
My mom’s house is making a metal clapping sound in one corner in high winds. I suspect that it is the roof.
The house (’60’s) and the sheet metal roof (+4 years) were installed with one corner of the roofing material running out past the roof. The last row of sheet metal is screwed down along the overlapping ridge, but stops about 4′ to 5′ from the bottom edge of the roof where the panels have run out past the existing roof. The two panels can be easily lifted by hand at the bottom edge of the roof.
Will a roofing screw secure two metal roofing sheets together without screwing into wood sheathing? Do the threads work as a typical sheet metal screw?
Is there a double sided tape that could hold the two sheets together that can applied at the bottom edge?
Any suggestions?
Replies
I can't figure out what you are trying to say. Surely the metal isn't entirely unfastened for 4-5'? But to answer part of your question there is a special "stitch" screw that is made to fasten the overlaps together. It's short and a larger diameter than roof screws, made for metal to metal.
Thanks for your comment. I'll look up "stitch" screws.
The last two sheet metal panels on one end of the roof are not fastened for the last 4' to 5' at the bottom edge where they run "off" the roof. The very last panel is small in width. A trim piece (gable end trim?) makes up the difference between the overhang and the gable wall.
I looked up "stitch" screws and it seems to be more like a sheet metal screw.
The roof was installed with the roofing screws applied on the ridges. I hear that roofing screws on the ridge is not recommended, usually citing concerns that the screw will work loose frame the sheathing with expansion/contraction.
Since there's no sheathing or framing at the end in my case, i'm inclined to follow the existing pattern on the ridges unless there's a good reason..