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Old 03-28-2012, 05:03 PM   #1
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ridge vent, box vents or none...


I have 1300 sq ft of attic space and a low pitch roof (not sure of the ratio). There are soffit vents along both sides of the house plus two gable vents. One roofer says I don't need additional ventilation the other says I need a ridge vent. All thoughts would be appreciated.

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twhlady

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Old 03-28-2012, 05:06 PM   #2
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ridge vent, box vents or none...


Ridge venting would be ideal if you have proper and unobstructed soffits.

Soffit + Ridge venting is a relatively ideal scenario as long as the design of the home/attic/roofline allow for it.

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Old 03-30-2012, 11:46 PM   #3
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ridge vent, box vents or none...


Thanks for your input. I have just one other question. Is there any truth to what I read that says, if you have gable vents don't use a ridge vent because it destroys the whole ventilation purpose?
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Old 03-31-2012, 12:39 AM   #4
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ridge vent, box vents or none...


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Originally Posted by Windows on Wash View Post
Ridge venting would be ideal if you have proper and unobstructed soffits.

Soffit + Ridge venting is a relatively ideal scenario as long as the design of the home/attic/roofline allow for it.
Agreed
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Old 03-31-2012, 12:42 AM   #5
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ridge vent, box vents or none...


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Originally Posted by twhlady View Post
Thanks for your input. I have just one other question. Is there any truth to what I read that says, if you have gable vents don't use a ridge vent because it destroys the whole ventilation purpose?

Not necessarily.Depends on the size of the gable vent.
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Old 03-31-2012, 12:27 PM   #6
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ridge vent, box vents or none...


Thank you roofmaster 417, I feel better about making my decision. This is a great site for people like myself that know nothing about roofing and have no one to ask. Thanks again!
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Old 03-31-2012, 02:16 PM   #7
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ridge vent, box vents or none...


1. Before giving you advice, we need to know your location.....

Wet, cold coastal areas may not need vents:http://www.fpl.fs.fed.us/documnts/pdf1999/tenwo99a.pdf

Hot, humid climates do better with conditioned attics rather than vented ones: http://www.joelstiburek.com/topten/south.htm

Air sealing the attic is as/more important than ventilation: http://www.jlconline.com/cgi-local/v...170a32100a05c7

2. Is your insulation per minimum code for your area?

3. Have you had ice-dams to warrant more ventilation?

4. Is there mold/mildew or wetness showing in the attic requiring installing more ventilation?

5. Is any HVAC ducting or units in the attic?

6. Has it ever been air-sealed?

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Old 03-31-2012, 07:08 PM   #8
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ridge vent, box vents or none...


All the information I have says if you have soffit vents, you should have ridge vents, 1st choice because no matter which direction the wind is from, one side is under pressure, and because it flows through the vent, it creates a siphoning effect out the exhausting side. Louvers and soffit are marginal, they don't exhaust the air above themselves, and depending on wind direction one is almost always pressurized and one exhausting. Ridge vent and louver, the ridge is going to draw air from louvers before soffits. Added to the rest of the info you got here you should be able to make a better decision.
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Old 03-31-2012, 09:40 PM   #9
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Wow GBR in WA you've given me more to think about! I live in Arkansas. How many people really give this much thought to putting on a new roof??? Lots of homework to do now! Thanks
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Old 04-01-2012, 10:57 AM   #10
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ridge vent, box vents or none...


Not really.

If you have existing soffit vents, you need to install a ridge vent and balance the system.

Despite Gary's links, you are not going to convert what is a vented attic into and unvented/conditioned one.
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Old 04-01-2012, 11:55 AM   #11
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ridge vent, box vents or none...


Thanks Windows on Wash! My next step, even though I have soffit vents, is to see if they are obstructed.
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Old 04-03-2012, 09:32 PM   #12
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ridge vent, box vents or none...


You are welcome, glad we could help! If one doesn't learn something everyday, they are not trying..... those should take you in to next week. LOL.

Gary

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