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Don_P
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# Posted: 22 May 2016 23:00
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You're into manufacturer's instructions. Personally I wouldn't put metal over grit without rosin paper or something as a slip sheet to prevent scratching it. Various forms of "ice and water" come without a mineral base. Check with the manufacturer first though.
The 5/8 is for screw withdrawal, suction uplift from high wind, so you should hold up fine unless you get that historic wind, then hope. Most people, myself included, hate to put enough screws in there. That bad day is what they are for. My nephew does roofs in south FL, talk about screwing metal down. That job also gets inspected there, for good reason.
I'm assuming no instructions are prohibiting tarpaper and none are showing the metal vented over the sheathing. Show me if I'm wrong and we'll put this one to bed.
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KinAlberta
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# Posted: 22 May 2016 23:15
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My thinking on the metal over old shingles, which isn't the point of this thread, is that there is an airspace to prevent trapping moisture.
The number of screws used is quite amazing but the roofing is very thin these days. Our old 1970s standing seam is thick enough that we can walk on it without any sheathing underneath it.
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Ditchmonkey
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# Posted: 31 May 2016 02:05
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Quoting: AK Seabee I place the structural screws directly adjacent to the rib
I wonder if you could provide more detail on what you mean by this? Do the screws go in at an angle, low on the rib?
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AK Seabee
Member
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# Posted: 2 Jun 2016 21:44
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Not my roof but the screenshot shows the screws adjacent to the rib
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sparky30_06
Member
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# Posted: 3 Jun 2016 06:53
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I've been around a lot of R panel roofs and have done a few myself. All the roofs have had 1x4 or 2x4 purlins running horizontally on 2' centers that the sheets where nailed (old school wouldn't recommend they back out over time) or screwed down too. yea it's a tad spongy to walk on but most manufactures of metal roofs will tell you this is an acceptable installation.
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Don_P
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# Posted: 3 Jun 2016 06:57
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wow, I hope not yours. That is missing some of the bottom screws. Find the manufacturers install directions, print them and have them on the jobsite. There is usually a page showing screw locations.
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AK Seabee
Member
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# Posted: 3 Jun 2016 18:54
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Don, there is alot wrong with the photo I did a screenshot of the first online photo showing the screws adjacent to the rib as that was the question asked. I probably should have looked a little longer to find a photo with the roof done correctly.
My cabin is 160 miles away so taking a photo of my roof is out of the question.
I agree with your statement. The folks selling the tin will provide installation instructions. If you dont follow the instructions they will more than likely void the warranty.
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