Tin roofs

One more plus about a metal roof over a shingle roof....... no worries about watering you chickens via a rain barrel.
 
If you use nails (we used to call them lead heads, but they are no longer available) with the rubber washer you nail into the ridge. If you use the screw with washer and gasket, it goes into the valley.
 
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I did lots of "research" on corrugated roofing. Nails vs screws. Ridges vs troughs. Yada, yada, yada.

In the end, I:

1. drilled pilot holes on the ridges
2. filled the holes with silicon glue
3. screwed in some screws with rubber washers


I also ran a bead of silicon glue along the joints to help keep water out.

Regarding cutting the roof and/or hardware cloth....I'd recommend some tin snips. OMG, they are so much better than wire cutters.
 
I've got a half finished coop with plywood on the roof, which was to be finished out with tin on top of that. Will the condensation eventually cause the plywood underneath to rot? Can I use plastic or something in between to prevent it?
 
I'm starting to see them more and more around here. We added and addition to the garage and replaced the roof with green metal. We also used it on the chicken coop, the house is going to be next. I think it has a longer life span than shingles and I know that our old shingles are rotting from the snow over the years (21 years).
 
Let me say if someone screws a metal roof down and don't place it on the flat, the product on the bottom of the washer will not make a seal. Not if you use roofing nails that won't work. The nails have to be placed on the ridge or they will leak. As I've said before the metal used on my coop came off my house when I had work done on my roof. But one thing to remember, screws just as nails will back out due to expansion and contraction. That can cause a leak if not looked at every few years.

For you new to tin roofs, lathing is all that is required. If you install press wood on the for an underlayment, then probably a sheet paper would be needed. But I've not had a tin roof sweat unless it was exposed to the outside air. Other may have had other experences but I've not seen it.
 
All you need for some condensation is a moisture source and the side of the metal away from the moisture to be cooler than the other. The metal cools off, moisture condenses out of the warmer air. That is simple physics. How moist the air is and the temperature difference make a a big difference.

In a cold climate with a poorly insulated coop where it is a little warmer inside and moisture is available from their breathing and poop, you can get condensation underneath, for example. Good ventilation will usually take care of this. Usually.

Do you need a vapor barrier? Depends on how you build it and your conditions. Where I am, if I keep good ventilation and don't put anything under the metal roof, it is not a problem. I've lived a lot of different places but I'll admit I do not have a lot of experience with this in all those places.
 

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