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Old 08-19-2008, 07:09 PM   #1
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added metal roof advice on ventilation


I have a single story 1965 ranch home in Austin Texas.

I have a screw down Rainguard panel roof.

My home has gables vents on the ends of the L shaped ranch design. I have no soffits currently and the gable vents are the only ventilation. the roof design has exposed rafter tails.

It is incredibly hot in my attic in the summer...

I am currently adding 72- 16"x6" metal soffit vents with an NFVA of 42 in/ piece for a total of ~3000 inches. One soffit vent between each rafter tail, in the bird blocking.

I am planning on adding a ridge vent to the roof using Cora-a-vent V-300 or Cor-a-Vent V-600. I plan to add it across the entire ridge which is approx ~140 feet.

Cor-a-vent 300 yields 13in/ft for a total of 1820 sq inches
Cor-a-vent 600 yields 20in/ft for a total of 2800 sq inches

So it would have either
A) soffit = 3000 and ridge =1820
B) soffit= 3000 and ridge = 2800

Which one would you recommend?

Any comments on Cor-a-vent Ridge vents?
Are they better than Cobra/ Owens Corning, or Profile Vent?
how much would you charge to install the ridge vent? ( I would supply the vent)


thanks!!!

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Old 08-19-2008, 09:58 PM   #2
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added metal roof advice on ventilation


Quote:
Originally Posted by citadelcadet View Post
I have no soffits currently and the gable vents are the only ventilation. the roof design has exposed rafter tails.

Cor-a-vent 300 yields 13in/ft for a total of 1820 sq inches
Cor-a-vent 600 yields 20in/ft for a total of 2800 sq inches

So it would have either
A) soffit = 3000 and ridge =1820
B) soffit= 3000 and ridge = 2800

Which one would you recommend?
The Gable Vents should be closed off when adding the Ridge Vents to the scenario to prevent short-circuiting the attic ventilation air flowage.

Use the one that most closely equals the amount of new Intake NFVA you are installing, which would be the C-A-V 600.

Ed

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Old 08-19-2008, 10:21 PM   #3
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added metal roof advice on ventilation


thanks!

would this be better than cobra vent or profile vent?

any idea on cost for labor to install ridge vent?
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Old 08-19-2008, 11:15 PM   #4
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added metal roof advice on ventilation


Texas wages are cheap, so there is no point on anyone not from that area commenting on illegal immigrant wage levels that have been established in your area.

The best Ridge Vent would be one that the Metal Roof Panel Manufacturer recommends to conform to the panel profile.

Contact them for their specifications or recommendations.

Ed
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Old 08-20-2008, 08:54 AM   #5
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added metal roof advice on ventilation


thanks Ed.

also, are there concerns around too much ventilation into an attic? Just wondering from a humidity and mositure persspective...
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Old 08-20-2008, 12:11 PM   #6
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added metal roof advice on ventilation


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Originally Posted by citadelcadet View Post
thanks Ed.

also, are there concerns around too much ventilation into an attic? Just wondering from a humidity and mositure persspective...
NO.

But it should be Balanced between the Intake and the Exhaust, with even a more optimum ratio of 60% Intake to 40% Exhaust.

Ed

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