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Last year I built a new house which as a thru-fastened (not standing seam) metal roof with a 6/12 slope. The house has perforated soffit vents under the overhangs, and gable vents at the ends of the roof.
The attic is VERY hot despite this, and I am considering adding additional ventilation. The installer of my roof first recommended ridge vents, presumably because they don't require cutting holes in the roof panels and using boots or other flashing which are unsightly and leak prone. Now they are saying they don't think those work very well, and I might be better off with conventional roof vents (like turbine vents).
I don't want to trade a hot attic for a wet attic, so any vents I use must not leak, and I would prefer not to have a bunch of unsightly flashings on the roof.
ARE ridge vents effective, and if so, can you give me some contacts for them?
If ridge vents are NOT effective, what would you suggest?
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Hi Ted,
Thanks for the questions. I am guessing that you're in a very warm climate.
The use of soffit vents with ridge vents provides for excellent natural, convective airflow. Soffit and gable vents do not create that sort of good flow.
I do suggest installing a ridge vent. Also, you might consider a couple of power vents hooked to a thermostat so that, when temperatures get very warm, they turn on. That's what I have in my house and they work great.
Also, make sure that your soffit vents are not blocked by insulation.
As for the type of ridge vent, I suggest contacting the manufacturer of the roofing and asking for their ridge vent detail. They probably have drawings showing the use of a couple of types of ridge vent. A very common method uses a plastic vent covered by metal matching the roofing panels.
If you have troubles getting info on ridge vents, contact me again ([email protected]) and I will help you come up with what you need.
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I would like to put a ridge vent on a metal roof that is maybe 50 years old. The raised parts are "U"s instead of "v"s and spaced equally about 6 inches apart. I intend to fill the spaces between the "U"s with 1x4 wood to give a level surface to attach the vent. Gaps could be filled with foam or caulk. I was thinking that it should be rigid metal but would consider plastic. I have not been able to find metal vents that look sturdy enough.
Should this plan work? Could you recommend a specific vent and where would I find it (hopefully in central North Carolina)? I have talked to both roofing contractors and suppliers and have not gotten any straight answers.
Any advice will be greatly appreciated.
Tom Smith
Chapel Hill, NC
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In all likelihood, you will need to come up with some sort of closure for the flat "pan" areas between the raised ribs and then, on top of that, you will sit a ridge vent assembly.
One venting product which could be adapted for this use that is fairly readily available is called Cor-A-Vent. The website is www.cor-a-vent.com
I would suggest contacting them and emailing them pictures of your currnet roof profile to see if they can help you.
Other than that, many of the MRA member manufacturing companies can probably help you in one way or another as well if you contact them directly.
5/16/2002
Isaiah Industries, Inc.
5/16/2002
4/1/2003
Isaiah Industries, Inc.
4/1/2003