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Question DetailsAsked on 2/17/2017

Attic fan installed on Cape Cod Ma.

I found my attic to be extremely hot last summer. I want to put in either roof vents or a solar fan. Need estimates and or contractor.

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1 Answer


Here is a previous similar question with answers on that subject -

Generally, with a peaked or ridged roof, ridge vents and occasionally a venting cupola is by far the best solution for attic ventilation - drawing the air from eave vents, and blocking off any gable vents leading into the same space. Occasionally, in smaller odd-shaped attic spaces and with odd shaped roofs, you will use a gable vent for intake and ridge vent for exhaust, or rarely eve vent intake and high-mounted gable vent exhaust - it all depends on roof and eave configuration.

In houses without eaves you sometimes have to add a covered eave vent - there are types made for use as add-one for flat and eaveless roofs - you just have to sure they are properly roofed over so they do not become a rain or roof drip inlet area if your roof has no overhang.

Flat roofs are tougher - generally they are ventilated with either all-around eave vents, or eave vents where possible (at rafter/joist opening ends) and powered or a LOT of natural ventilation turbines or roof vents scattered around the roof - which of course means more places to potentially leak if you have more penetrations. Better-designed flat roofs have a raised (well above water and snow level - typically 3-4 feet high) ventilation plenum across the middle of the roof (crosswise to the rafters) with vents coming up off it (or fully ventilated with eave vents in it) to exhaust the air coming in through the eave vents. Or sometimes, though energy inefficient, powered vent fans are put there.

And on powered vents - my recommendation - forget the ones with built-in solar power - the amount of power they generate is not enough to give meaningful ventilation - you are better off with just open airflow ventilation hoods or (though unsightly) elevated ventilation caps on standup ducting.

For eave and ridge vents Roofing would be your Search the List category. For unpowered roof vents Roofing or Heating and A/C would be the category - Heating and A/C normally for powered ones.

Answered 3 years ago by LCD

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