Detached Garage Roof Venting QUICK Q

[lucrestyle]

New member, 1st post. There is alot of great information on this board. Thanks to the membership.

some of you may recognize my UN from other forums / youtube.

feel free to browse my vids on youtube
youtube.com/lucrestlye


now for my question.

I have a 24x24 detached garage, Northern Ontario - temps range from -30c to +30c.

I am in the process of finishing the garage, I have just purchased a Mr Heater 75,000BTU Propane Heater, currently the garage has no insulation / wall / ceiling covering. But I will be finishing that shortly.

The roof has 24inch soffit vents 360 degrees, this includes continuous soffit venting from the gutter to the peak as well as along the sides.

If I install those Styrofoam soffit vent panels from the soffit towards the peak is it really necessary to install a ridge vent / wirly bird / box vent / gable vent?

or will the venting I have be adequate? my thinking behind that is on either end at the peak, hot air can escape through the soffit vent.

 

[lucrestyle]

TTT - any insight?

thanks

 

[Falcon67]

Depends on how your end gable (assumption here) is built - I have end gables but there is no way for air to move from the inside of the building to the gable soffits. So having soffit vents there is useless. I will be using 4x12" soffit vents, 5 per side and 5 evenly spaced passive vents near the peak.

 

[MoonRise]

You do not want 'competing' vent items.

Ridge vent or (properly sized and spaced) roof vents, but not both.

Also, unless you have some sort of venting channels in place, gable/end 'soffit' vents on the gable overhangs aren't doing anything for the airflow.

General venting idea: air comes in at the 'bottom' (soffit vents typically) and then exits out the 'top' (ridge vent or roof vents near the peak/ridge, but not both).

 

[henrysgarage]

Yes you need to vent the roof separately. Typically the end soffits are sealed from the attic by the last truss over the wall and the end piece (ladder truss sp) that has the soffit on it is just to bring the roof from the wall.