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Question DetailsAsked on 9/14/2017

New home with soffit & ridge vents and my attic is very hot. 130deg can we stuff ridge vent and install fans?

Stuff ridge vent with rock wool.

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1 Answer


Here are some previous questions about attic ventilation, attic fans, and ridge vents with answer, FYI:

Basically speaking, assuming a peaked roof (not very low slope or flat), proper eave venting to a ridge vent will take care of the situation, and even if you want to ventilate the attic with supplemental powered fans or vent turbines or such, you do not want to block the ridge vents. In some instances, particularly when the attic has occupied rooms in it, thermostatically controlled powered fans are added to get the summer temp down - but there is no reason to remove the ridge venting - if they vent some of the heat that is fine, you just have to be sure the fans are not installed so they pull air directly from the ridge vents, they should pull from the airflow coming up under the roof in the rafter bays, and from the upper third of the roof area. Commonly, in this situation, again assuming a peaked roof with true attic, not cathedral type ceiling with no real attic space, one would use gable fan(s) with powered louvers (so the gable opening is not open when the fan is not on, to prevent eave to ridge flow diversion to the gable). Or individual smaller fans or vents in the upper half of the roof pulling from individual rafter bays - though you need to be sure they are not located where wagter infiltration from snow damming/melting is a risk in the winter, if applicable for your area.

You do not say where you are located - but 130 degrees is a pretty normal vented attic temp in the summer in all but the coolest areas - I live in what would be called cold country by most people, with summer daytime air temps commonly nont over the 60's, and in our area 120-130 is a common attic temp up under the rafters, with proper eave and ridge venting. As long as you do not have a moisture issue, that is not hot enough to be considered dangerously destructive to the framing or roofing. Unvented attics commonly run 140-160 in the summer - and that is in the range where wood materials start deteriorating.

Of course, one has to hope they installed proper insulation to keep that heat out of the house proper - typically R38-R60. Here is an EnergyStar link with recommended attic insulation by area:

Answered 3 years ago by LCD

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