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Old 04-04-2011, 08:51 AM   #1
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Roof venting suggestions?


We moved into our house last year and quickly realized that in the heat of St Louis summers our attic was sorely lacking in the ventilation department.

We have a single 7/12 pitch 1800sqft 1970's ranch w/ venting along both gable end soffits with no other means of ventilation. The 60' ridge goes east-west, if that makes any difference. For those unaware, St Louis gets 4 seasons...0 in winter w/ snow, 100 in summer with high humidity. I dont see any signs of damage in the attic (moisture, rot, etc) but at the same time, 30-50+ degrees over ambient cant be good.

The question is, would I be better off with a ridge vent across the entire 60' ridge (is there any such thing as "too much venting"?), or two passive turbine vents on the back side of the house? I have no problems installing either.

Thanks,

Doug


Last edited by redline9k; 04-04-2011 at 09:11 AM.
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Old 04-04-2011, 03:30 PM   #2
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Roof venting suggestions?


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Originally Posted by redline9k View Post
We moved into our house last year and quickly realized that in the heat of St Louis summers our attic was sorely lacking in the ventilation department.

We have a single 7/12 pitch 1800sqft 1970's ranch w/ venting along both gable end soffits with no other means of ventilation. The 60' ridge goes east-west, if that makes any difference. For those unaware, St Louis gets 4 seasons...0 in winter w/ snow, 100 in summer with high humidity. I dont see any signs of damage in the attic (moisture, rot, etc) but at the same time, 30-50+ degrees over ambient cant be good.

The question is, would I be better off with a ridge vent across the entire 60' ridge (is there any such thing as "too much venting"?), or two passive turbine vents on the back side of the house? I have no problems installing either.

Thanks,

Doug
There is no such thing as too much venting.

I'd use the ridge vent in your situation.

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Old 04-04-2011, 03:39 PM   #3
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Roof venting suggestions?


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w/ venting along both gable end soffits with no other means of ventilation.
Doug
Hello Doug.
I would look into ridge vent but it means you have to have a space at the ridge for air to escape.
If the framers built the ridge "tight", you have to remove the caps and shingles and cut out 2" of the plywood sheathing on each side.
This is standard in the industry.

BTW......you don't have soffits on your gable ends. The soffits are on your eaves ...........Just helping with the correct terminology.
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Old 04-05-2011, 07:50 AM   #4
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Roof venting suggestions?


ok, thanks....ridge it is.

Do you guys have a preference of ridge vent? It seems there are plenty of brands/models/designs to choose from.

So there would be nothing wrong with going the entire length of the ridge (except for 12" on either end) for a 58' continuous vent?
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Old 04-05-2011, 07:59 AM   #5
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Roof venting suggestions?


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ok, thanks....ridge it is.

Do you guys have a preference of ridge vent? It seems there are plenty of brands/models/designs to choose from.

So there would be nothing wrong with going the entire length of the ridge (except for 12" on either end) for a 58' continuous vent?

We probably each have a different preference.

Nothing wrong with what you propose.
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Old 04-05-2011, 09:02 AM   #6
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Roof venting suggestions?


The vinyl/plastic ones like Cora-vent and woven fabric are the best.








Just stay away from the aluminum ones.
People step on them and they dent and squash.

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Old 04-05-2011, 11:01 AM   #7
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Roof venting suggestions?


Perfect - thank you.

I checked out the coravent and it seems like a good product and very straight forward. I have done a few small roofing tearoffs before and dont mind working up there, so that shouldnt be a problem.

One last question...if I go with coravent or similar, would it be a good idea to lay a thin fabric (like garden fabric or felt) down before the vent to keep out any bug, rain driven water, etc, or will the coravent handle that stuff just fine?

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Old 04-05-2011, 10:37 PM   #8
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Roof venting suggestions?


The baffled ones are good; http://www.oikos.com/esb/30/atticvent.html

http://files.buildsite.com/dbderived...rived20936.pdf


For others reading; compressible mesh;http://www.inspectapedia.com/interiors/atticcond10.htm

http://www.ronhungarter.com/black_mold.html

http://www.ronhungarter.com/ventilation_repairs.html

Gary
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Old 04-06-2011, 09:01 AM   #9
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Roof venting suggestions?


FYI for anyone else looking at ridge vents...the baffled systems do appear to be a much better product after further review.

Thanks for the help guys. ShingleVent II is on order and will go on this weekend.
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Old 04-06-2011, 09:13 AM   #10
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Roof venting suggestions?


Good job in your search and inquirey

Post some pics as you go through your process.
Stuff like that can always be a benefit to others watching.
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Old 04-06-2011, 11:47 AM   #11
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Roof venting suggestions?


Turbine vents are an optical illusion. They spin in the breeze, but the only real venting they do is the size of the hole they're in.

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