Ventilation and Ridge Vents

As a side note on the powered fan. do not install a powered fan if you have ridge vents.

Air gets pulled from the easiest and closest source to the fan. That means when your powered fan kicks in, it will draw air from the ridge vent as opposed to the soffits. air gets heated up as it passes the black composite shingles and then gets pulled in at the top from the ridge vent and then pushed back out the powered fan. the air coming in through the ridge vent is much, much hotter than the air pulled from the soffits. soooo... if you already have a ridge vent at the top of your attic, you are not going to get the bonus you think you are.

At my first house, I did exactly what you did. I put in the ridge vents because they are a step up from the whirlybirds or airhawks since ridge vents, vent the air at the highest point and generally have the largest amount of exit surface as well. yes, I felt like I had shot myself in the foot. I did what someone else had posted and stapled the radiant barrier to the rafters to make a channel from the soffits to the ridge vents. I also added more soffit vents to increase the amount of air that could get into the attic since the ridge vents had increased the amount of air that could exit. I look at it as upgrade steps. you have added more passive air flow to increase cooling, but when you step up to active air flow, you have to plan where your entering air comes from (i.e. the North side soffits if you can).

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