Venting is an absolute. I have used cupolas but got rain inside. On my latest building I used the 10' ridge cap vents, using 2 on a 50' building.
The other thing is sweating. When the roof and the atmosphere are at the same temp no problem. But when the roof is cooler than the ambient it will sweat and drip amount depends upon humidity for one thing. The water will run down the tin to your roof pearlin and drip from there.
To stop it you need a vapor barrier. I have a tin roof and use the vinyl covered rolls containing an air bubble core with a layer of alum foil on both sides and then vinyl over that. It has adhesive where each layer meets the other so that you can seal it all up and if a sag should occur the water couldn't get out.
I have a roof extension to the building of 15' forming a lean-to shed and it drips due to no insulation being under that.
I never had a composition roof sweat, course I always included 15# felt as the first layer over the wood sheeting as others have mentioned.
Felt under a tin roof wouldn't work as the felt would sag and drip in the sags.
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Today's Featured Article - Tuning-Up Your Tractor: Plugs & Compression Testing - by Curtis Von Fange. The engine seems to run rough. In the exhaust you can hear an occasion 'poofing' sound like somethings not firing on all cylinders. Under loaded conditions the tractor seems to lack power and it belches black smoke out of the exhaust. For some reason it just doesn't want to start up without cranking and cranking the starter. All these conditions can be signals that your unit is in need of a tune up. Ok, so what is involved in a tune up? You say, swap plugs and file the points....now tha
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