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igneous1 05-06-2010 03:40 PM

Pitch and ridge vents
Question to the pros. Are steeper roofs more or less inclined to benefit from ridge vents? Does it depend on the product used? Seems to me that the hot air must 'drop' to be removed from ridge cap or is it a pressure gradient that makes this work?

I'm in the process of adding a smaller powered vent above the garage, which has our media/game room directly above it. The garage attic is closed off from the rest of the house, so it will not be removing conditioned air from living space. The game room stays 5+ deg. warmer most of the year, since we're in Dallas area. Beside adding electric fan, should ridge venting also be installed above game room since it has a 25' horizontal ridge directly above.

I recently installed radiant barrier foil to 2/3rd's of the attic. The west side, which has the master suite and a study, I could not access since it basically is one-story and the rest of the house is 2 story w/16' ceiling in den. This really made a difference in our cooling bill! I definitely recommend doing this yourself in the fall/winter.

Anyway, question is....should I install ridge vent above our master bedroom also? Can't really access it to install attic fan, and don't want the fan humming going on/off all nite. Attic has plenty of insulation.
These 2 warmer areas in question-- the game room and master br have long ridges and are well below highest roof point, which has passive vents at peak.
Didn't mean to write a book, but what do you experts recommend?

seeyou 05-06-2010 09:10 PM

Roof slope shouldn't have significant bearing on ridge vent effectiveness. Different brands/models have different flow rates, but the highest flow rate might not make the best ridge vent for all situations. A higher flow rate vent that admits fine snow would be a problem in my area, but maybe not in yours.

I'm confused by your second paragraph. Isn't the media room living space? But, typically mixing powered roof vents and ridge vents is not a good idea.

I'd avoid a power vent over the bedroom if possible. I wouldn't be concerned about ridges at several levels. Do you have adequate inlet (soffit vent) for the ridge vents?

Ed the Roofer 05-07-2010 01:53 PM

The steeper the roof, the more cubic feet of air space is in the attic cavity, so maximize the amount of ventilation both for intake and exhaust.

A rule of thumb provided by Air Vent, is that if it is a steep sloped roof, add 30% more to the ventilation specifications.


igneous1 05-10-2010 04:07 PM

Thanks for the replies guys. I have turned in an 'architectural request' with our Home Owners Ass. I don't think they will ok installing the shinglevent II product. I may be able to get away with a low profile option. My question is, which 'low profile' gives the best airflow? I'm with you Ed, more interested in function than looks--but dealing with a HOA is another thing altogether. I'd just like to install the
ridge vents over the 2nd floor long ridge and above the MBR suite. The main part of our house has cathedral summit in attic with 4 passive vents on 3 sides, so it should be ventilated ok since the ridge is only about 4' long there at the very top.
Maybe I can talk the HOA committee into letting me install a low profile product. Our house was built 2004 and has the small soffit holes around the whole house and baffles to keep the insulation out of the way.
No wood, all is hardiboard. They are large enough to let air in without letting in bugs/wasps.

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