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Old 06-06-2012, 12:57 PM   #1
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Attic ventilation

I have a hip roof. My attic needs good ventilation badly to prevent molds from growing. One estimate recommends power venting, another recommends continuous ridge vents, and more soffits. I would like safety in my house too. I've read one customer comment that used power venting, where his house almost burned do twn, but was caught early because a neighbor saw smoke coming from the roof and then fire ignited.

Please advise. Thank you. I. Haug


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Old 06-06-2012, 01:45 PM   #2
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With mensuration formulas and some fussing you can figure out the volume of your hip roof attic in cu. ft., then ventilate with 5 to 60 Air Changes per Hour, with the average being 10.

That fire was a fluke unless his wiring to the fan was faulty or he ignored the fan installation instructions.


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Old 06-06-2012, 04:52 PM   #3
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Had the same problem. Builder put in soffit venting then the insulation installers stuffed insulation and blocked most of them. I cleaned out what I could reach but it wasn't enough and still had moisture problems. I then installed 2 turbine vents and they pull enough air to have solved the problem.
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Old 06-07-2012, 11:59 PM   #4
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Check your required NFVA:

Be sure the fan is rated for the space:

Have you air-sealed the attic yet, to stop the moisture from below (stack effect):

Do you have mold growing now? Where are you located?

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17,000 dryer fires a year, when did you last clean the inside of the dryer near motor or the exhaust ducting?
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