Common mistakes in mixed ventilation

September 8, 2016 canplas

Ridge vent, tall vent, turbo vent, pot vent – with so many vent choices out there, it’s hard to know which ones to choose. At Canplas, we recommend selecting only one type of vent for your rooftop.

So how do you know if you’re selecting the right type of vent? It’s important to ensure that you’re not short circuiting your ventilation system. This means first calculating the amount of ventilation you will need, which we talk about here.

With mixed ventilation, your vents might end up pulling from each other, instead of from the soffits. This can be prevented with the right number of the same type of vents.

If you have a tall vent that has a larger net free area, it’s going to draw from your roof vent that has a smaller net free area, instead of your soffits,” said Donna Burtch, Duraflo product manager, Canplas. “All that they’re doing is exchanging air and your shingles are going to deteriorate.

The net free area is the range in your attic that the roof vent will be drawing air from.

Without proper ventilation, a roof top will start to build up moisture or damage from the sun—curled up roof shingles, ice damming and mold.

Burtch noted that if your vents are all the same, and you have the right number of vents, you will draw from the soffits instead of from each other.

It’s important to take into account a combination of roof pitch, attic size and climate when selecting your roof vents. We go into more detail on how to select the correct roof vent for your application here.

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