Roof ventilation

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Forum topic by Bob posted 01-13-2018 04:25 PM 777 views 0 times favorited 9 replies Add to Favorites Watch
View Bob's profile


20 posts in 2319 days

01-13-2018 04:25 PM

Topic tags/keywords: shop venting air coppola

Well I built my dream shop and I love it. I appreciate all of the wonderful feedback and I will post pictures soon. I have a follow up question. I built a 36’ x 36’ pole barn and then insulated the roof and walls and covered with plywood (walls) and plastic (ceiling.) When I covered the ceiling, I covered the Coppola venting. It gets really hot in the summer, as you can imagine.

But it also gets cold in the winter and I am installing a Modine heater next week. These heaters “layer” the heat starting at top of the ceiling (20 ft)

Should I open the plastic to allow air out in summer but also in winter? Could I mount a exhaust fan the sucks up hot air through the coppola in the winter and limits air escaping in the winter?

I appreciate any ideas.


-- Bob

9 replies so far

View Bob's profile


20 posts in 2319 days

#1 posted 01-13-2018 04:43 PM

-- Bob

View Ripper70's profile


1377 posts in 1681 days

#2 posted 01-13-2018 04:44 PM

I think you can’t have too much ventilation. If I’m not mistaken, the problem with obstructing the venting in your roof would be unwanted condensation buildup. An exhaust fan with a thermostat could be the solution. I have one in my attic that turns on when the temperature reaches 95 degrees during the summer.

-- "You know, I'm such a great driver, it's incomprehensible that they took my license away." --Vince Ricardo

View johnstoneb's profile


3144 posts in 2945 days

#3 posted 01-13-2018 05:04 PM

The purpose of that cupola was to vent an uninsulated space ie. the attic. I hope you put some type of space between the roof and the insulation if not you could have moisture problem between the roof and the insulation. You can open up the cupola now and use it to vent you building space in the summer. You don’t want it open in the winter if the space is heated as all your heat will vent to the outside.

-- Bruce, Boise, ID

View alittleoff's profile


548 posts in 2049 days

#4 posted 01-13-2018 07:52 PM

What type material or insulation did you use for the roof? Also how did you put it up, directly to the roof decking with glue? I’m about to insulate my shop roof in a week or so and need some ideas also.

View OnhillWW's profile


242 posts in 2005 days

#5 posted 01-13-2018 08:05 PM

I agree 100% w/ Ripper70. Coppola operable in the heat and closed off in the cold. Hard to make out your exact situation so it’s hard to layout a definitive plan. Air trapped between insulation and roof deck MUST be vented 24/7 or as johnstoneb stated you will get premature rotting. The exception is spray on foam as there is no void between the two materials.

-- Cheap is expensive! - my Dad

View Walker's profile


385 posts in 1245 days

#6 posted 01-14-2018 02:41 AM

do you have any other ventilation like a ridge vent or box vents? I would definitely cut the plastic to the let the venting to its job. If it’s still too warm in the summer, consider swapping the plastic for radiant barrier.

-- ~Walker

View woodbutcherbynight's profile


6069 posts in 3181 days

#7 posted 01-14-2018 08:50 PM

I agree with the exhaust fan for summer. For the winter a simple cover would be sufficient to keep the warm in. The exhaust fan is also a bonus when spraying a finish as it will vent off the fumes. Mine is mounted in the eave and I leave a window open to get crossflow which has worked well for 20+ years with no issues. Simple but simple is good ya know?

-- Live to tell the stories, they sound better that way.

View Bob's profile


20 posts in 2319 days

#8 posted 01-14-2018 10:46 PM

Thank you all very much. I have learned much. I will place fan up in the Coppola at the apex of my ceiling. This will provide air circulation for my insulation and will remove hot air. I will seal it off in the winter.

Much appreciated!!

-- Bob

View a1Jim's profile


118066 posts in 4350 days

#9 posted 01-14-2018 11:36 PM

Besides heating and cooling, you need to vent moisture out of your building that should include vents in your soffits and in your roof.


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