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Question DetailsAsked on 10/8/2014

Where should a roof attic fan be placed? Also, should the space over the garage not be considered when doing so?

A provider told me that my old roof attic fan was placed improperly. They wanted to place it more central, and not include the garage area in that estimate of "central". They also said that the old fan area would be best used as a vent. Now I am curious where the best place to really place a roof attic fan is, and if the garage area should not be considered even though the attic as a whole covers that area too.

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IF your garage attic area is connected to the house attic, then it needs to be considered. If there is a wall between them (drywalled or plywood) which is fairly well sealed against air exchange, then you handle the garage separately. It may need its own venting, or if has no separate attic so is open to the garage space, except in very hot areas you may get by without attic venting other than a gable vent, for instance.


Your best ventilation system is generally screened eave vents feeding air to ridge vents (on significantly sloped roofs), but if you want to go with a fan system it should be thermostatically controlled, and if centrally located should have eave or gable vents to provide outside air to replace the hot air exhausted by the fan. Alternative, though makes for less even attic temps across the width of the attic and is less effective at keeping the roof cooler, is a gable fan creating a cross-ventilation with another gable vent on the opposite wall - though with the garage there that would only be possible by a gable vent in garage wall. That would be illegal in most code jurisdictions, which generally require a firewall between attached garage and house attic.

Answered 4 years ago by LCD




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