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Old 03-11-2012, 11:00 AM   #1
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Roof vents necessary in moderate climate?


The roof of my house does not have any vents. I'm not noticing any problems so far. Iím wondering if they are really necessary as I live in San Francisco where it rarely gets very hot or very cold. Any advice is appreciated.

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Old 03-11-2012, 03:10 PM   #2
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Roof vents necessary in moderate climate?


Ventilation is not a hot or cold issue but a moisture issue.

I guarantee you that you reach dew point regardless of the mildness of your climate.

Depends on the roofing system but most homes are based on ventilated designs.

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Old 03-11-2012, 08:49 PM   #3
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Roof vents necessary in moderate climate?


you have to have ventilation in your roof unless you don't cook bath shower breath or live in your home. Moisture vapor is your home and it needs to vent some how. Wither it is from soffets vents to ridge vent or gable vents your roof has to breath
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Old 03-11-2012, 11:57 PM   #4
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Roof vents necessary in moderate climate?


Welcome to the forums!

1. How long have you lived in this house and noticed "no problems"?

2. Do you have a plastic vapor barrier under the floor insulation?

3. Are there HVAC units or ducting in the attic?

4. Has the attic ever been air-sealed? All plumbing/wiring holes to the rooms below been plugged with canned foam/caulking. Around light fixtures, plumbing chases, etc.

5. Has the basement/crawl- if one- been air sealed?

Gary
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Old 03-12-2012, 01:57 PM   #5
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Roof vents necessary in moderate climate?


Ventilation is definitely a must. First of all it validates your warranty. It will make your roof last longer.

You always want to keep the inside of your roof close to the temperature on the outside that way you don't have condensation build up inside your roof.

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Old 03-12-2012, 04:52 PM   #6
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Roof vents necessary in moderate climate?


All recommendations for ventilation should probably be tabled until the poster actually identifies the type of roof that they have.
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Old 03-17-2012, 05:25 PM   #7
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Roof vents necessary in moderate climate?


Gary,

Apologies for the late response. Here are answers to your questions.

1. How long have you lived in this house and noticed "no problems"?
A: 3 years.

2. Do you have a plastic vapor barrier under the floor insulation?
A: There is floor insulation in the attic but no plastic vapor barrier underneath it.

3. Are there HVAC units or ducting in the attic?
A: Yes, one heating duct from a forced air heater goes thru the attic.

4. Has the attic ever been air-sealed? All plumbing/wiring holes to the rooms below been plugged with canned foam/caulking. Around light fixtures, plumbing chases, etc.
A: I do not believe it has been air-sealed.

5. Has the basement/crawl- if one- been air sealed?
A: I do not believe it has been air-sealed.

Thank you very much.
Kevin
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Old 03-17-2012, 05:27 PM   #8
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Roof vents necessary in moderate climate?


To answer "Windows on Wash's" question. I have an asphalt shingle roof. Let me know if you need any more details.

Thanks so much!!
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Old 03-17-2012, 11:57 PM   #9
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Roof vents necessary in moderate climate?


Thanks. Air sealing is plugging all attic holes as you have done already. Insulating to minimum R-value for your area is required. Wrapping the heat/ac duct with insulation and a vapor barrier is needed. I would air seal the holes/chases in the basement/crawl to help stop the "stack effect": http://www.wag-aic.org/1999/WAG_99_baker.pdf

With the moisture in the air from the Bay nearby, you may not need/want venting, pp. 4,5: http://www.wag-aic.org/1999/WAG_99_baker.pdf

Air sealing importance: http://www.jlconline.com/cgi-local/v...170a32100a05c7

Shingle life (though may lose the warranty); http://www.professionalroofing.net/a...2/feature2.asp
Compare your climate to those quoted. We have thousands of 1900's built houses in my area non-vented, still standing.

Gary

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