kayaksteve
Senior Member
Where do you screw your metal roofing and why?
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Flats or ribs
- Thread starter kayaksteve
- Start date
naildrvr
Senior Member
My supplier has always told me to screw it in the flats. He says screwing in the ribs can cause the ribs to split when the metal contracts and expands and will void the warranty. However, the ridge caps are screwed down into the ribs.
Duff
Senior Member
^^^^ what nd said
livinoutdoors
Goatherding Non-socialist Bohemian Luddite
Ive heard people say ribs for extra leak protection, but it never seemed like it would make sense to do that to me anyway. Flats and just enough to get a secure roof. No more holes than you have too.
I've put a few screws in the ribs. So far no leaks. X 2 on as few as necessary to secure your roof.
Ribs. Definitely. Every time I've screwed tin down in the flats, it leaked like a sieve eventually. The house I live in has had the same tin roof since the 1940s I reckon, nailed in the ribs, and it's never leaked a drop.
I ain't a roofer and I didn't stay at a Holiday Inn last night but -- Every old v crimp roof I have seen that was nailed on had the nails in the ribs. Some of them were upwards of 75 years old. There must have been a reason. I suspect the rib helps move water away from the nail hole more effectively.
livinoutdoors
Goatherding Non-socialist Bohemian Luddite
Maybe they had to cuz the nails back then vs washers now. Dunno. Either way its bettern shingles!
Washers will give out over time.
Those rubber washers only last a few years in the sunlight. Then they dry-rot, crack, and fall off.
livinoutdoors
Goatherding Non-socialist Bohemian Luddite
Well i must be lucky then.
livinoutdoors
Goatherding Non-socialist Bohemian Luddite
Its a ribs vs flat war! 
Yep. I've had a bunch do that.
livinoutdoors
Goatherding Non-socialist Bohemian Luddite
Yall quit buying them cheap walmarks washers.
These were neoprene and the sheet metal shop sold them to me and told me they were the best.
livinoutdoors
Goatherding Non-socialist Bohemian Luddite
Prob saw ya comin n sold ya the cheapy ones .....
Im sure mine will start leakin on a week im super busy or something.
livinoutdoors
Goatherding Non-socialist Bohemian Luddite
Did it flatten out and seal over the nail?
livinoutdoors
Goatherding Non-socialist Bohemian Luddite
Cool! Well i just learned something. Thanks!
