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Question DetailsAsked on 7/28/2015

I live in St. Louis, MO. I found the roof of my house only have soffit vent, is it enough? Do I need ridge vent?

We found the ceiling got mold and paints are peeling off, seems like there is condensation problem. This house was renovated 10 years ago and the previous owner lift the ceiling and removed the attic. There is only soffit vent, no other vent. Do we need to install the ridge vent to fix this problem? And which ridge vent is the best?

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Voted Best Answer

I am not certain if you meant he enclosed the attic, so the "attic" is not just the space between the rafters, or what.

But just soffit vents, which would be meaningless unless they connect with open eaves between the rafters - you might have to shine a light through or remove a soffit to check that out - would not provide ventilation to the attic or underside of the roof where it needs it. Assuming you have a typical roof with trusses or rafters running up-downslope from ridge to eaves, the air should come in the soffit vents (if you have soffit covers), through the eave vents (with one of the above insect screened), then flows up alongthe rafter bays, and then out through a ridge vent. So yes, you likely need ridge venting - a Roofer is the best person to do that.

I prefer the labyrinth rigid type like the Cobra Snow Country Advanced myself - the rollout and mesh type just get too clogged with blown debris and frost for my liking, though if in a severe blowing rain environment rather than snow environment I would say the mesh type like Cobra Ridge Runner might keep splash out better. Definitely (in my opinion) use the Filtered type (which block windblown rain,snow, seeds, insects, etc) as opposed to the unfiltered type.

You can find a lot of prior similar questions with answers in the Home > Roofing link found right below your question - both ones about ridge vents and eave vents, and ones about converting unconditioned attic space to living space and the issues that causes. Here is one in particular to get you started -

Answered 4 years ago by LCD

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