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Old 04-28-2008, 09:36 PM   #1
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4/12slope ridge vent?


I have a ranch w/ 4/12 slope, 1200 sq.ft. w/ 4' overhang with soffet vents. Am re-roofing but heard ridge vents should not be used on 4/12 slope. Have gable vents which I assume should be blocked if ridge vent used. Michigan climate. Thanks

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Old 04-28-2008, 10:54 PM   #2
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4/12slope ridge vent?


I have used the plastic interlinking Cobra system made by GAF on some pretty low slopes. We prep the ridge with a layer of ice/water, then make slightly oversized cap from the regular architectural shingles we used on the roof, I think this method has been used about 4-5 times over past 3 years, cant recall any repairs. Gable should be sealed and eve vented, but many customers lately have been making up their own rules so it seems almost anything will work ok, but they end up not using the ridge vent capability, to its full capacity.

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Old 04-28-2008, 11:03 PM   #3
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4/12slope ridge vent?


Thanks Gus: What do you mean by "prep with ice/water"?
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Old 04-28-2008, 11:11 PM   #4
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4/12slope ridge vent?


[quote=gusthehonky;119780]I have used the plastic interlinking Cobra system made by GAF on some pretty low slopes. We prep the ridge with a layer of ice/water, then make slightly oversized cap from the regular architectural shingles we used on the roof

Thats ugly,architectural shingles cut up for ridgecap.Seen it,what an eyesore,IMO.
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Old 04-28-2008, 11:26 PM   #5
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4/12slope ridge vent?


I know, funny looking but ends being tough to see because of slope. Really just do it to gain that tiny bit to give that channel a bit more cover.
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Old 04-28-2008, 11:32 PM   #6
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4/12slope ridge vent?


I see where your coming from,why not try weatherpro by duraflow,good from 3 1/2-14/12 has a baffle system that wards offsnow and driving rain
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Old 04-28-2008, 11:35 PM   #7
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4/12slope ridge vent?


Ice/Water is a protective layer placed under first layer, atop any drip edge, in valleys, and a bunch of other places where there is a higher potential for leaking, pooling or ice daming up. Its kinda like a rubbery version of the grip tape used for traction on handicapped ramps. Really good stuff, and is required. Can be very temperamental in the hotter months, don't get it stuck to itself or you.
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Old 04-28-2008, 11:41 PM   #8
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4/12slope ridge vent?


Not full partner, & its roofing!: sane and logical ideas are met with brutal opposition, resistance to change is a mantra.
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Old 04-29-2008, 01:45 PM   #9
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4/12slope ridge vent?


I use the Shingle Vent II all the time on 4/12 pitch roofs, like at least 20-30 of them per year, with no problems and no additional steps to make sure it works.

For times on a 12/12 cape cod, which has a 2/12 flat roof dormer on the rear side, I install a J-Channel inside of the ridge vent to act as an intenal baffle to deflect any potential moisture, water or snow, intrusion concerns.

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Old 04-29-2008, 02:15 PM   #10
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4/12slope ridge vent?


Here are some photos of the Smart Vent for intake, placed, along the eave edge on one side and as a mid-roof application on the other side and using the Shingle Vent II Ridge Vent on the entire ridge line.

http://www.contractortalk.com/showthread.php?t=37659

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Old 04-30-2008, 01:01 AM   #11
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4/12slope ridge vent?


never a problem with a ridge vent on that pitch,yes close the gable vents when using both ridge and soffit vents to requirements

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