Metal corrugated roof! Ugh...

[Mybackyardpeepers]

Ventilation is not really the issue here, tho it maybe contributing.

Not how to explain it simply....other than:
Condensation will form on a cold surface exposed to warmer humid air.
Metal roofing, with no wood or insulation under it, is especially conducive to this happening.

Michigan(where both OP and I live) can be very humid,
especially since we recently got 2' of snow on unfrozen ground followed by warmer temps.

Yup going from 50 degrees at 8am to cold again, ugh!

 

[Mybackyardpeepers]

So sorry you're having issues, I put my metal roof over OSB and tar paper and have had no issue with our Wisconsin winters, the 4 walls of my coop are insulated.View attachment 1968956

I will definitely put tar paper over the plywood next year when I redo the roof. Thank you!

 

[Mybackyardpeepers]

We've got metal on our animal buildings, though they are smaller sheds like the OP's building - here in the Pacific NW and we don't have the issue. Then again, we installed plywood first, then installed ice/water shield made for use with metal and/or ceramic tile roofs-- on the ENTIRE surface- installed a ridge vent the whole length- and plenty of windows - no problems in any weather.

What is ice/water shield?

 

[Mybackyardpeepers]

If the roof had a proper pitch, any humidity condensing on the underside should flow down and out of the coop, and not be dripping inside.
Pics not showing up for some reason!

Honestly I'm not happy with the pitch, and no overhangs.

 

[Coon Cotten]

My husband and I had a nice south side, metal roof porch once totally open on 3 sides. It constantly dripped. It was also so hot to set on because the heat just radiated off the roof. We moved away, but when we came back I told him no more metal. We now have a wood roof with shingles.

 

[Mimi13]

To answer your question... The whole roof is beads of water. I have felt a drip or two while cleaning, etc. I have never seen them come out damp in the morning so I don't think it is a constant dropping, but if it rains I bet it will with extra water. Pictures will be posted soon.

Rain is not the cause of the condensation. It is the temperature difference inside and outside and the humidity that causes the water droplets to form.

I would also warn against putting any kind of wood, plywood, OSB, hardboard, under the metal unless you put a barrier between them. Something like roofing felt. If not, you’ll have a bigger mess on your hands in a very short time.

 

[cmom]

I haven't read all of the posts yet but some of my roofs are wood with roofing felt paper over the wood just like if you were going to put on a house. I live in Florida where it is humid most of the time. I realize I don't have to deal with the snow. I do have some coops that have just metal for the roofs. I don't have the condensation problem but the coops have good ventilation. My bother is a retired general contractor. I used 1x4 wood under the metal. He lives in Traverse City, Mich. and he said they use 2x4 wood under the metal.

 

[wyoDreamer]

Ice/water shield is a rubber membrane - usually with an self-adhesive backing that you put down along the edges of the roof before putting down the roof felt and shingles/metal roofing. Its purpose is to stop the moisture from soaking into the wood sheeting of the roof when ice dams form along the bottom edge of the roof. melted snow/rain will back up behind the ice dams and actually flow up between the shingles and get underneath them.

 

[cmom]

I did a lot of research prior to putting the metal roofs on my coops. I watched a lot of YouTube videos.

 

[Mybackyardpeepers]

My husband and I had a nice south side, metal roof porch once totally open on 3 sides. It constantly dripped. It was also so hot to set on because the heat just radiated off the roof. We moved away, but when we came back I told him no more metal. We now have a wood roof with shingles.

It was actually not bad in the summer months (hot wise) I'm going to install a large window on the back side, with the covered run I should be able to leave it open a lot.