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Old 06-30-2009, 11:28 PM   #16
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You are not understanding the plywood repair as prescribed.

Also, I looked up the Omni Ridge Vent Lo Profile one you mentioned. I like their regular 4 foot sectional versions, but that Lo Profile only offers 11 square inches of NFVA per foot, when most brands, like the Cobra Snow Country or Advanced and also the Shingle Vent II, each offer 18 square inches per lineal foot.

That is way too much of a sacrifice on ventilation specifications for most homes I have run the calculations on to be satisfied with, but you were correct about it being gun nailable.


LOR9-4 Shingle Over Ridge Vent

Optional Pneumatic Nail Gun or

Hammer Installed.
Internal Aerodynamic Curved Baffles.
External Perpendicular Omni Baffles.
Weatherproof Underlapping Joint.

Four Drain Holes per Foot per Side.

11" Net Free Area per Linear Foot.

External Venturi Baffle.Adjust from 3/12 to 16/12 roof pitches.

Nail Holes Marked Every 6 inches - Supported Every Foot.
Molded Nail Lines.
Molded Centerline for Fast and
Easy Alignment.
Alignment Tabs.
External Water Shield.
Slot Width Guide Lines.
Patented Molded-in Fanfolded Endplug Fits.

30-year transferable warranty.This is an exhaust louver.


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Old 07-01-2009, 06:36 AM   #17
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Please let us know how the problem is eventually resolved.
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Old 07-01-2009, 06:39 AM   #18
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I reread your post Ed, and understand what you are talking about. It would just require a few more rows of shingles to be taken off, but would work well.

Never had a ventilation problem with the omni roll. Have used it on many houses including my own.

GAF claims over 14 NFVA on their regular Cobra vent, but I have seen where it actually is one of the worst ventilators in comparison tests. The problem with the ventilators that have the webbing in them is that they get dirty and lose their claimed performance. Moisture collects and dirt sticks. Good idea, just is slowly being proven not to work in the long run.
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Old 07-01-2009, 05:49 PM   #19
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I agree with personal observations about the Cobra Roll Vent, the one that looks like a brillo pad or furnace filter type material.

I see those clogged with algae growth, showing that no air flow is warding off the growth and that moisture remains inside the structure.

I have not seen that problem on Shingle Vent II on ridge vents I installed over 10-12 years ago that I have checked up on though.

I am glad that you reread the plywood repair so that you knew what I was talking about.

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Old 07-06-2009, 11:38 AM   #20
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Well after 20 calls to GAF putting a stop payment on his check and sending a certified letter. The owner came out and met with the inspector and then came the next day and repaired everything. Why he changed his mind I don't know but it is fixed and I am happy and it was fixed before our big storm this weekend. No leaks....
Thanks for all your input.


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