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Old 11-06-2008, 03:52 PM   #1
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House Ventilation


I am going to have a new roof put on my house and pool house, and I would like to get some info from the pros.

I have a concern about the ventilation being done properly, specifically the exhaust.

I have continious soffit all around the eaves, and it is clear of obstruction.

I have a gable vent in the end over the room above the garage, and a turbine near that also. Area is appx 850sf.

I also have three turbines on the main roof, and the area is appx 1550sf.

The main ridges are 12 and 10ft, the gable ridge is 30ft, and is 7 ft lower than the main.

The roof is one layer, and I will have it torn off. Twenty years on this roof, so not too bad I guess as is.

Here is a link to pics of the house and pool house. I dont know how to post them directly.

http://s508.photobucket.com/albums/s328/oldm60grunt/

I realize mixing the vents as mine are is wrong. I do not want to use power venting unless absolutely necessary. Dont know if ridge vent is possible, as not much ridge to work with over hip area.

In the attic, I could probably separate the hip and gable areas if necessary. Lot of work though.

The pool house is 19 x 44(836sf), and has 3 small turtle vents, which I will replace with ridge vent.

The pitch is (I think) 10/12 mostly, with the shed dormer and small back porch 4/12.

Any insight on the house would be greatly appreciated.

Alan

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Old 11-09-2008, 12:06 PM   #2
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Still hoping Ed and others can offer recommendations.

Alan

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Old 11-10-2008, 01:51 AM   #3
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get rid of the turbines,and power fans,put in ridge vent,and close any gable louvres--you have enough ridge area,and your intake is very good,too many sources of air creates a problem,because it doesn`t allow for proper cross ventilation to occur (intake air gets pulled in by exhaust leaving attic)
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Old 11-10-2008, 07:02 AM   #4
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Thanks TRG!

Alan
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Old 11-11-2008, 01:18 AM   #5
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Every 3 ft of ridgevent is equivalent to 1 75 sq inch vent. You have enough ridge to equal about 20 of these vents. Definetly ridgevent is going to be lots
Dale (DC Roofing Inc)
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Old 11-11-2008, 03:33 AM   #6
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you`re welcome ,Alan
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Old 11-11-2008, 07:58 AM   #7
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Thanks Dale!

General consensus is for ridge vents, and to close the turbines and gable vent, so that is the way I will go.

It is so nice to have this forum with excellent response from the pros.

Alan
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Old 11-11-2008, 03:02 PM   #8
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Sorry, I have been busy tha past 2 days and just had a root canal done.....Ouch!!!

If the ridge that is 7 feet lower than the other main ridge lines is connected to the same attic space, to properly ventilate that attic areas contained air, you should sperarate the opposing attic sections, which could easily be done with a wall made of plastic visqueen.

Most ridge vent brands provide 18 square inches of NFVA ventilation exhaust capacity, but the ones with an external wind deflecting baffle, such as the Shingle Vent II or the Cobra Snow Country, also provide an increased performance beyond the thermal buoyancy aspect, by using even a moderate air current flowing over the baffle to pull more air out of the attic cavity.

Most standard static air mushroom vents are rated for 50 square inches per vent hole, assuming that the hole cut out is precisely 10" x 10", which rarely occurs in the real world, therefore they are even less effective in actual usage.

You do not want to have more than one style of exhaust ventilation product enabled in the same attic chamber, as that would create a "Short-Circuited" air flow path.

Is the ceiling in the Pool House structure a standard attic or a vaulted/cathedral ceiling?

If it is a cathedral/vaulted ceiling style, I would not be opposed to installing a "Low Profile" ridge vent product, from a manufacturer who allows this per their specifications, as a Hip Vent. Owens Corning and Mid-America provided a Ridge Vent that is also specified as a hip vent.

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Old 11-11-2008, 03:22 PM   #9
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Hi Ed,

Thanks for the response.

The pool house has an attic. It has six inch insulation though it is not heated or cooled. Just did that to help keep it cooler below during the summer.

I intend to close the turtle vents and add a ridge vent.

Alan

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