Ridge Vent Not Vented

 
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Old 05-08-2018, 05:01 AM   #1
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Ridge Vent Not Vented


For our personal home renovation & addition the GC is about to call for mechanical inspections. I was walking around observing stuff and just realized the GC's roofer did not vent the ridge vents. The sheathing runs up and tight to the to the double LVL beam - no gaps whatsoever.

What are the (only) professional and acceptable remedies for addressing this, to which we should accept nothing less?
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Old 05-08-2018, 06:05 AM   #2
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Re: Ridge Vent Not Vented


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For our personal home renovation & addition the GC is about to call for mechanical inspections. I was walking around observing stuff and just realized the GC's roofer did not vent the ridge vents. The sheathing runs up and tight to the to the double LVL beam - no gaps whatsoever.

What are the (only) professional and acceptable remedies for addressing this, to which we should accept nothing less?
Pull off the vent and cut the osb back. Iíve never seen a roofer cut that out, always done by the framer.

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Old 05-08-2018, 06:49 AM   #3
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Re: Ridge Vent Not Vented


I would personally have used static air vents (turtle, pot, can whatever you want to call them) or some off ridge vents. with a 3 1/2" ridge. That is the max sized opening as it is, much further and it has true leak potential
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Old 05-08-2018, 06:57 AM   #4
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Re: Ridge Vent Not Vented


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I would personally have used static air vents (turtle, pot, can whatever you want to call them) or some off ridge vents. with a 3 1/2" ridge. That is the max sized opening as it is, much further and it has true leak potential
Do you mean those squarish roof louvers? I suppose we could have those installed on the backside of the ridge. Our prevailing winds hit the front side anyway.

Btw, this is on a cape cod, (12-12 roof with the ridge vents), with 4/12 roof on the rear addition (no ridge vents at all).
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Old 05-08-2018, 07:38 AM   #5
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Re: Ridge Vent Not Vented


Those are the ones
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Old 05-08-2018, 08:13 AM   #6
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Re: Ridge Vent Not Vented


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Originally Posted by MarkJames View Post
For our personal home renovation & addition the GC is about to call for mechanical inspections. I was walking around observing stuff and just realized the GC's roofer did not vent the ridge vents. The sheathing runs up and tight to the to the double LVL beam - no gaps whatsoever.

What are the (only) professional and acceptable remedies for addressing this, to which we should accept nothing less?
Are the soffits properly vented to work with a ridge vent?

If that was the design, then the correct solution would be to pull the ridge vent, open it up and put the ridge vent system back.

Couple hunnerd bucks in materials and 1/2 day labor.
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Old 05-08-2018, 08:18 AM   #7
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Re: Ridge Vent Not Vented


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Are the soffits properly vented to work with a ridge vent?

If that was the design, then the correct solution would be to pull the ridge vent, open it up and put the ridge vent system back.

Couple hunnerd bucks in materials and 1/2 day labor.
The ridge is too wide. If it get the adequate 1" cut on both sides there will be a 5 1/2" slot at the ridge
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Old 05-08-2018, 08:25 AM   #8
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Re: Ridge Vent Not Vented


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The ridge is too wide. If it get the adequate 1" cut on both sides there will be a 5 1/2" slot at the ridge
Gotcha. I'm with you on the roof pots performing better anyway - ugly or not.

My expectation is the ridge vent system would be pulled, pots cut in, and regular cap shingles placed on ridge.
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Old 05-08-2018, 08:26 AM   #9
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Re: Ridge Vent Not Vented


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The ridge is too wide. If it get the adequate 1" cut on both sides there will be a 5 1/2" slot at the ridge
And at that point , the square can vent are the only real solution.
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Old 05-08-2018, 08:33 AM   #10
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Re: Ridge Vent Not Vented


Make sure they use enough of them to give you the Net Free Area needed
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Old 05-08-2018, 09:09 AM   #11
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Re: Ridge Vent Not Vented


Quote:
Originally Posted by SmallTownGuy View Post
Are the soffits properly vented to work with a ridge vent?

If that was the design, then the correct solution would be to pull the ridge vent, open it up and put the ridge vent system back.

Couple hunnerd bucks in materials and 1/2 day labor.
Soffits are not yet vented, but they're supposed to be. We're still house-wrapped, awaiting a couple more windows. The carpenters installed a solid piece under the soffit so I'm curious how they handle that when the time comes. I understood us to be getting vented stuff under there.
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Old 05-08-2018, 09:15 AM   #12
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Re: Ridge Vent Not Vented


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Soffits are not yet vented, but they're supposed to be. We're still house-wrapped, awaiting a couple more windows. The carpenters installed a solid piece under the soffit so I'm curious how they handle that when the time comes. I understood us to be getting vented stuff under there.
Flip the saw upside down and cut mailbox slots. But most crews won't do every joist space, so its not good as could be.

We just run 2 pieces of ply/OSB with a gap in between. Fast, easy.
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Old Yesterday, 01:59 PM   #13
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Re: Ridge Vent Not Vented


Quote:
Originally Posted by SmallTownGuy View Post
Quote:
Originally Posted by MarkJames View Post
For our personal home renovation & addition the GC is about to call for mechanical inspections. I was walking around observing stuff and just realized the GC's roofer did not vent the ridge vents. The sheathing runs up and tight to the to the double LVL beam - no gaps whatsoever. <img src="http://img.contractortalk.com/smilies/mad.gif" border="0" alt="" title="Mad" class="inlineimg" />

What are the (only) professional and acceptable remedies for addressing this, to which we should accept nothing less?
Are the soffits properly vented to work with a ridge vent?

If that was the design, then the correct solution would be to pull the ridge vent, open it up and put the ridge vent system back.

Couple hunnerd bucks in materials and 1/2 day labor.
I concur.

And no u shouldn't put box vents on the back side of the roof behind the ridge vent. Why would you even consider that? Do u know how much work is involved in doing that after the fact? Much easier just to pull the ridge vent off and cut the decking back like it's supposed to be.

Proper Ventilation is Paramount on a roof.

There's a formula for how much air gets sucked in and how much gets pushed out.

The first step in determining how many vents you need is to calculate the Net Free Area (NFA) required. Most codes use the 1/300 rule for minimum residential attic ventilation recommendations. (1/150 is preferred). This means that for every 300 square feet of enclosed attic space, 1 square foot of ventilation is required – with half at the upper portion (exhaust vents) and half in the lower portion (intake vents).

For a home with 2000 square feet of attic floor space, you’ll first divide 2000 by 300 (2000 / 300 = 6.66). You need 6.66 square feet of attic ventilation. Since you want a balanced system, you divide by 2 so that half of the ventilation is intake and half is exhaust. Thus, 6.66 divided by 2 = 3.33 square feet of attic ventilation for intake and 3.33 square feet of attic ventilation for exhaust. Because vents are rated in square inches, you need to convert the square feet required to square inches. This is accomplished by taking the square feet recommended and multiplying by 144. Thus, 3.33 X 144 = 480 square inches of attic ventilation is required for intake and 480 square inches for exhaust.

Box vents
Ridge vent
Turbines
Powervents

Each has a different sq in of exhaust allowance.

Do the math to figure out what you need. And choose one exhaust system and one intake system. Put them at the top and the bottom, anything inbetween disturbs the flow of air.

I realized you said your ridge vent is not cut but if it were cut and you put box vents right behind it, the air would circulate in one and out the other right there at the ridge of the roof while everything else bounced around and created a stuffy moldy attic.

C'mon kids this should be common knowledge
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Old Yesterday, 02:31 PM   #14
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Re: Ridge Vent Not Vented


The easiest way to do this is to cut a few roof vents along the ridge
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Old Yesterday, 03:07 PM   #15
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Re: Ridge Vent Not Vented


Here's the house.

Yes, the soffits are vented to breathe, front and sides, but not the dormers. The fake ridge vent is up there, and will probably stay. We're going to add at least 4 box vents in the rear portion.
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Old Yesterday, 03:09 PM   #16
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Re: Ridge Vent Not Vented


Pics for an idea. The felt pic shows where the pots are going to go....the leeward side of the 4:12 addition. It's a bad pic, but along that back ridge.

As for the framing pic, that is looking up where the original roof, extended upward and the beam, etc. And that's the first rafter of the addition.
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ridge vent not vented-house2.jpg   ridge vent not vented-house3.jpg   ridge vent not vented-house4.jpg  

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Old Yesterday, 03:17 PM   #17
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Re: Ridge Vent Not Vented


Fwiw. (Ignore that incompleted "treehouse" peeking out the back.)

The pic appears far worse than the siding and roofing, for some reason.
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Last edited by MarkJames; Yesterday at 03:19 PM.
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Old Yesterday, 04:03 PM   #18
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Re: Ridge Vent Not Vented


Is it me, or do those dormers seem a little large?
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Old Yesterday, 04:10 PM   #19
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Re: Ridge Vent Not Vented


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Is it me, or do those dormers seem a little large?
Large, yes, but they're more proportional to the house than the pic shows. Bad case of lens distortion. I should have moved back and zoomed.

And to the extent that they're not, the bedroom floor plans seem to make up for it.

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