Metal roof construction (ventilation?)

[3KillerBs]

What warmth is imparted simply helps air exchange, causing the structure to draw more cool air from under the eaves to vent at the ridge.

I will note that the flat roof on the brooder does not have this effect. There is probably no material on earth that would keep a flat roof cool in the sun.

When I have the chance I'll have to rebuild the brooder with a sloped roof.

 

[aart]

So should I notch out for the roof supports or attach them on top like they are in the first pic?

No notches.
...and not like the first pic, use traditional rafter layout with purlins for metal support/attachment.
That will allow better overhang all around.

 

[rayrose]

Make sure your roofing material is painted white on both
sides. It will reflect the heat and make your coop much cooler
in the summer. Same thing with a covered run. I agree with
aart. No notches. See my coop.

 

[Silexian]

IMO, if you have adequate airflow directly under the metal radiant heat is not a problem. My coop is in the direct sun in a hot climate but inside is the coolest place in the yard because the roof slopes and vents were placed to capture the summer breeze and to take advantage of the chimney effect -- directing hot air up and out the clerestory while pulling cool air in.

Mine coops are well ventilated also. The plywood and tar paper is not a necessity and is strictly a recommendation. For comparison. I know that my barn which is well ventilated and not insulated. Forms condensation(enough that it sometimes drips) and in the winter frost on the underside of the metal roofing, feels hotter(could just be me) and is almost deafening during a heavy rain. Compared to my insulated shop building or my coops with plywood under the metal roofing. I feel it is worth the little bit of extra cost and labor.