Vented overhangs on the building

[HeartlandDan]

I had a 30x36 pole barn built by a contractor. I had them put a 1' vented overhangs on the building. They were finished for the day and left. When I got home from work I found they had put venting on the gable end. So now it is vented all the way around. Do I need to have the gable end plugged for daft or just leave them. I am going to use R-19 bats on the walls and blow in insulation in the attic.

 

[The Cobbler]

do you meant he gable end overhang is vented? there's nothing wrong with that. you can't have too much venting .

 

[HeartlandDan]

Yes it is vented all the way around.

 

[Marctrees]

So, if you have soffit intake venting, and you are putting in a ceiling and blowing on top of that ceiling, obviously you need convective output vents... pref ridge, but a sufficient area of gable end or some kinda roof vents instead/ also.

What's the question exactly ?

Why would you plug the gable vents in any case ( as long as you ARE venting) ?

Sounds like you have limited experience w this, so I'll say... make SURE you make arrangements to NOT get your soffit intakes blocked by the insul.

Marc

 

[HeartlandDan]

By venting the overhangs and having a vented roof across the top you are creating a drift that will pull the heat out though the top. IF the ends are vented too I am asking does this hurt the drift or is there any effect.

 

[egdede]

As I understand, it depends on whether the ridge vents were appropriate for the soffit vents. specifically, the gable end vents might keep air from venting in the center of the structure. But, if the soffits are allowing too much air for the ridge vents, then the gable end vents might help. As discussed above, do not let insulation interfere with airflow from the soffit to the attic area.

 

[Kaizen]

No harm in doing gable walls as well. Just make sure your ridge is vented.



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[Samh]

do you meant he gable end overhang is vented? there's nothing wrong with that. you can't have too much venting .

I have been going through this with my build currently. I'd say that isn't true in all cases. I believe the gable end overhangs shouldn't be vented. But if they are strictly on the outside, then it would be a moot point.

As I understand, it depends on whether the ridge vents were appropriate for the soffit vents. specifically, the gable end vents might keep air from venting in the center of the structure. But, if the soffits are allowing too much air for the ridge vents, then the gable end vents might help. As discussed above, do not let insulation interfere with airflow from the soffit to the attic area.

Everything I have read has said it is an either/or situation. The problem with having both gable end vents and ridge vents, is it can short-circuit the system, and start pulling air in the gable end vents and out the ridge, thereby rendering the soffit vents pointless.

 

[Kaizen]

I have been going through this with my build currently. I'd say that isn't true in all cases. I believe the gable end overhangs shouldn't be vented. But if they are strictly on the outside, then it would be a moot point.







Everything I have read has said it is an either/or situation. The problem with having both gable end vents and ridge vents, is it can short-circuit the system, and start pulling air in the gable end vents and out the ridge, thereby rendering the soffit vents pointless.

So what. The purpose is to vent. Doesn’t matter where it vents. Sounds like you are set in your opinion on this so why are you asking? Mask them off if you are losing sleep over it


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[850xpeps]

The more venting the better. Not sure what this “drift “ theory is. In the summer the hot air will rise up pulling cool air in.

Where the air comes in and leavings depends on lots including wind. Don’t block any venting with insulation.

 

[Augus7us]

I'm not expert but I don't get the 'drift' issue either. All my reading seemed to indicate if anything was going to be an issue it wasn't too many soffit vents, but not enough ridge vent. I.e. I only have a square hole in the center of my roof with a cupola over it, versus a long vent spanning the length of my roof.

Either way I did learn that if you're going to blow in insulation get some baffles like this to keep the insulation from covering the soffits.

https://www.homedepot.com/p/ADO-Pro...h-Built-In-Baffle-10-Ctn-UDVB234610/202389935

 

[rburke65]

Well there’s a thought.....no sense in having vents if you’re going to blow insulation atop them

 

[Samh]

So what. The purpose is to vent. Doesn’t matter where it vents. Sounds like you are set in your opinion on this so why are you asking? Mask them off if you are losing sleep over it


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I am not the OP, just sharing what info I have come across for my build. There is plenty of conflicting info, so I am definitely not set in my opinion.

 

[Kaizen]

I am not the OP, just sharing what info I have come across for my build. There is plenty of conflicting info, so I am definitely not set in my opinion.

Sorry. Heat rises. The peak is highest point. Pretty basic. I haven’t seen this conflicting info. Probably not applicable in 99% of the garages out there


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[anythingyoucanimagine]

The goal is to always have the underside of your roof deck be the same temp and humidity as outside ambient. No venting is too much venting but some venting can encroach on inside/conditioned space.

Biggest thing with venting in many areas is keeping the critters out. Wide crown stapler and 1/4" galv screen does wonders.

 

[Samh]

Sorry. Heat rises. The peak is highest point. Pretty basic. I haven’t seen this conflicting info. Probably not applicable in 99% of the garages out there


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LOL, no worries. In another thread on here, someone posted this link, which is what I am going to go by.

https://www.greenbuildingadvisor.com/article/lstibureks-rules-for-venting-roofs

basically the idea being lots of soffit vent, not as much ridge/upper and the goal is to washing the underside of the roof with air

 

[ford33]

In snow country having the underside of the roof cold will help prevent ice damming. If you reduce or prevent the flow of air across the underside of the roof on a vented attic, especially at the soffit area, you will likely develop warm spots that will melt the snow on the roof which then freezes in at night resulting in slowly building an ice dam and water leaks.

Keeping a steady flow of air across the underside of the roof sheathing is what you want to have happen. The gable vents will disrupt that steady flow and limit the air movement under the roof.

OP should calculate to confirm ridge and soffit venting is sized correctly then determine if gable vents should be blocked.

 

[DieselNut88]

I would not vent the gable ends. If the soffit is vented you need a ridge vent. You want the air to travel from soffit to ridge. If the gable is also vented that will mess up airflow. I think soffit vents provide better ventilation than gable ones.