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  • Do I need more attic vents or fans?

    It's certainly hot and humid right now in Georgia. I was in our house's attic this past week and couldn't believe just how hot it was up there in the afternoon. We recently had a new roof put on due to hail storm damage, and the original square vents were replaced with ridge vents per the contractors advice. Maybe it was just cheaper for him to do this, or maybe it is now code, I don't know. It just seems hotter now than I ever remember in the 7 years in this house.

    My question is do I need to do more to remove the heat? Would an exhaust fan help? If an exhaust fan were installed, would it suck up the blown in insulation material and block the fan?

  • #2
    Re: Do I need more attic vents or fans?

    Originally posted by BobMcCormick View Post
    It's certainly hot and humid right now in Georgia. I was in our house's attic this past week and couldn't believe just how hot it was up there in the afternoon. We recently had a new roof put on due to hail storm damage, and the original square vents were replaced with ridge vents per the contractors advice. Maybe it was just cheaper for him to do this, or maybe it is now code, I don't know. It just seems hotter now than I ever remember in the 7 years in this house.

    My question is do I need to do more to remove the heat? yes

    Would an exhaust fan help? yes it will help

    If an exhaust fan were installed, would it suck up the blown in insulation material and block the fan? no it will not i have one

    is there soffit vents tis will help bring in cooler air as the hot air is going out the ridge vent
    i have ridge vent to but i have vents on the sides of the house and one has a fan pulling air out .
    Charlie

    My seek the peek fundraiser page
    http://observatory.mountwashington.o...nal&fr_id=1040


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    • #3
      Re: Do I need more attic vents or fans?

      I agree with Hawk. You need good unobstructed soffit vents, they are your intake and the roof vent or in your case ridge vent is the exhaust. If you have soffit vents check and make sure that they are not plugged up with insulation. You should have free air flow from your eaves into your roof cavity. If you don't have them try and put some in.

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      • #4
        Re: Do I need more attic vents or fans?

        When you have a ridge vent and soffit vents, that should be adequate. To add more vents, such as gable vents, you could create a down draft in the attic. This could cause your heat to go downwards instead of up and out. Maybe you could try some turtle shells on the roof to release more hot air.

        Ridge vent and soffit vent together is a good system. Could be that the ridge vent wasn't cut out big enough or the shingle were nailed down to tightly and smashed the ridge meshing.

        A power vent for the gable "might" do good, as long as there's flappers that closes when not in use. However some of them can sound damn near like a jet, kind of loud.

        Now I'm no Engineer or an expert in attic down draft, but I know this can happen when there is improperly place vents.

        One more thing, insulation can be blocking the soffit vents and or some homes (if older) had blocking placed in between the rafter tails on top of the top plate. There are hundreds of homes built around here that had this done. You need at least 1" of space between the insulation and the underside of the roof sheathing for minimum proper air flow and roof cooling....
        Great Link for a Construction Owner/Tradesmen, and just say Garager sent you....

        http://www.contractorspub.com

        A good climbing rope will last you 3 to 5 years, a bad climbing rope will last you a life time !!!

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        • #5
          Re: Do I need more attic vents or fans?

          We just finished building an addition on a house which had a ridge vent on the roof. When we pealed back the old roof the felt and shingles were run tight to the ridge with no opening to the vent. The house is about ten years old and the owner told us the roof was original.
          It reminded me that I have run into this several times over the years. Don't know if they forget and run the shingles to high and don't want to cut back or what, but I have seen it quite a lot.
          I would check the ridge vent to be positive it is open.

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          • #6
            Re: Do I need more attic vents or fans?

            thats why i have a fan when they did my roof with the ridge vent they did not cut the opening big enough and i dont have a lot of soffit vents
            Charlie

            My seek the peek fundraiser page
            http://observatory.mountwashington.o...nal&fr_id=1040


            http://www.mountwashington.org/weather/conditions.php

            new work pictures 12/09
            http://public.fotki.com/hvachawk/

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            • #7
              Re: Do I need more attic vents or fans?

              Anyone with experience with the solar attic fans?

              J.C.

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              • #8
                Re: Do I need more attic vents or fans?

                Originally posted by JCsPlumbing View Post
                Anyone with experience with the solar attic fans?

                J.C.
                Not yet. I am thinking about one for the shop to move the hot air out of the space above the ceiling. The price is more than a AC powered fan but this is offset somewhat by not needing to run any wires or possibly having to add a breaker.

                I have one of those cheap indoor/outdoor thermometers and I put the outdoor sensor up there for a few days to see what the temps were like. The thing goes offscale high at 124F, down below in the shop it will be hovering just below 80F and the outside temps are in the high 80s. I plan to add a mini-split heat pump which should handle cooling OK and for our area the heat pump should do fine on most winter days.
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