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That's interesting.
I wonder if it maybe depends on the gauge of the roofing, or something like that. Or climate?
The roofing I've worked with (all from one manufacturer) explicitly said to screw through the *ribs* for roof installation; and that is the typical way it is installed up here, in fact I noticed while running a couple errands just now that all three barns and both hardware stores that I pass close enough to see how the roofing is put on are ALL screwed through the *ribs*.
The only barns I've known with serious leakage problems (usually when there's a wet snowpack up there) have been ones where the roofing is screwed through the flat part not the ribs.
I don't know what gauge my roofing is, but it's whatever code requires for a 4-in-12 pitch with the (fairly heavy) wind and snow loads required here... screwing through the ribs does not deform or weaken them at all. Pretty strong stuff.
Although actually I notice that Palruf and Suntuf, the rather flimsy corrugated *plastic* roofings, also specify that you should screw through the ribs.
Dunno. Funny.
That's interesting.
I wonder if it maybe depends on the gauge of the roofing, or something like that. Or climate?
The roofing I've worked with (all from one manufacturer) explicitly said to screw through the *ribs* for roof installation; and that is the typical way it is installed up here, in fact I noticed while running a couple errands just now that all three barns and both hardware stores that I pass close enough to see how the roofing is put on are ALL screwed through the *ribs*.
The only barns I've known with serious leakage problems (usually when there's a wet snowpack up there) have been ones where the roofing is screwed through the flat part not the ribs.
I don't know what gauge my roofing is, but it's whatever code requires for a 4-in-12 pitch with the (fairly heavy) wind and snow loads required here... screwing through the ribs does not deform or weaken them at all. Pretty strong stuff.
Although actually I notice that Palruf and Suntuf, the rather flimsy corrugated *plastic* roofings, also specify that you should screw through the ribs.
Dunno. Funny.
Leaving the ends of the metal corrugations open for ventilation will help keep your roof sheathing/felt dry.
Agree, as long as there is a sheet of something under the roof. If it is just screwed onto purlins, with nothing or just glued-on insulation underneath, leaving the ends open can get snow blowing in in some climates/sites.
e.t.a. for the poster who asked about rodents - honestly if you've got rodents desperate enough to be climbing up the outside of the coop and in thru roof corrugations, they'll get in some OTHER way too... but if you really wanted to block off the corrugation openings, you could buy the profile strips they sell (have to get the one that matches your roofing).
Not a contractor for any number of years at all <g>, but having done stuff and noticed how barns I've worked in are built,
Pat
Agree, as long as there is a sheet of something under the roof. If it is just screwed onto purlins, with nothing or just glued-on insulation underneath, leaving the ends open can get snow blowing in in some climates/sites.
e.t.a. for the poster who asked about rodents - honestly if you've got rodents desperate enough to be climbing up the outside of the coop and in thru roof corrugations, they'll get in some OTHER way too... but if you really wanted to block off the corrugation openings, you could buy the profile strips they sell (have to get the one that matches your roofing).
Not a contractor for any number of years at all <g>, but having done stuff and noticed how barns I've worked in are built,
Pat
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