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Old 05-12-2014, 11:45 AM   #1
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Attic is HOT after new roof


It was around 70 degrees inside this past weekend, outdoor around 75. The temperature in my attic hit 100 degrees. Is this normal?

We had a new roof put on last September, a "rip" not a re-layer. The roofers suggested I go with an attic fan since the current setup used an attic fan. So he installed a new attic fan and set the thermostat to 95 degrees. My roof has 2 gable louvers on each side and only the front has soffits- Another reason for going with the attic fan over a ridge vent. I'm not sure that the front soffits are functional for air intake.

I called the roofer and he sent someone to pull back the insulation that might be blocking the air intake from the soffits. This did not help.

My concern is that it is not even summer yet and my attic is already getting up to 100 degrees. I'm not sure if this is too hot. Also I don't want the attic fan running 24/7 as it is pretty loud and wasting $.

Anyone have any advice?

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Old 05-12-2014, 12:14 PM   #2
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Attic is HOT after new roof


Make sure the venting is correct is the first place to start.

100 degree attic with 70-75 degree ambient temps is pretty normal.

What was the shingle color before?

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Old 05-12-2014, 12:32 PM   #3
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Attic is HOT after new roof


we moved into the house last August and had the roof done in Sept, so we weren't there prior to the new roof. I'm thinking the insulation might be blocking the air from the soffits.

It's a tough squeeze to get to the soffit from from in the attic. I wonder if I had someone shine a light at the soffit from outside at night and then go into the attic to see if I can see the light at all?
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Old 05-12-2014, 01:57 PM   #4
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Attic is HOT after new roof


You can try shining a light and see if it works. I had soffit vents and found out after 20 years, the vent holes were clogged up with dust and dirt. Not insulation, that was blocked from coming to the soffits, but just dirt, moisture forming a hard crusty layer. Had to have all the soffit vents replaced.
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Old 05-12-2014, 02:52 PM   #5
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Attic is HOT after new roof


As long as the attic fan is working, I wouldn't be overly concerned about it. Attics with proper ventilation are still really hot.
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Old 05-12-2014, 05:42 PM   #6
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Attic is HOT after new roof


The fan won't run 24/7 b/c once the sun sets, it will start to cool quickly.
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Old 05-13-2014, 01:17 PM   #7
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Attic is HOT after new roof


Well, the fan WILL be running most of the day throughout the entire summer. I'd rather not pay for that.
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Old 05-13-2014, 01:23 PM   #8
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Attic is HOT after new roof


These rafter vents would have ben a good idea. Shouldn't this have been done by the roofers!?!
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Old 05-13-2014, 01:23 PM   #9
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Attic is HOT after new roof


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Old 05-13-2014, 01:43 PM   #10
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Attic is HOT after new roof


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Well, the fan WILL be running most of the day throughout the entire summer. I'd rather not pay for that.
Well do you want your attic cooler? Nothing is free anymore. If you wanted free you should have made sure the roofers checked the soffit vents were clear, put in a ridge vent and blocked the gable vents.
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Old 05-13-2014, 02:13 PM   #11
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Attic is HOT after new roof


Sure, in hindsight. But I'm not a roofer. I try to understand as much as I can but leave most of it to the "Professionals". It's afterwards when things don't seem quite right that I start to investigate.

My roofer said that he could come back and put a ridge vent in, but I only have soffits on the the front of the house. Not sure if that would be enough intake for passive cooling. As far as cost, I calculated a 3oo watt fan running 8 hours a day to be about $7 a month. That's a long time to see a return on investment if I had the roofers install a ridge vent.

I also forgot about my side gable vents. Even if the insulation was blocking the soffits in the front, shouldn't the attic fan pull air in through those gable vents?
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Old 05-13-2014, 05:36 PM   #12
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Attic is HOT after new roof


The problem with power vents/attic fans is that they are going to pull air from somewhere. Ideally, you've got adequate intake to exhaust ratios. But in your case, I'm not so sure. If the intake into the attic is not sufficient, the attic fan can start pulling air out of the conditioned space through cracks and light fixtures. Your roofer really needs to check and see that your attic has a balanced airflow.
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Old 05-13-2014, 07:33 PM   #13
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Attic is HOT after new roof


Quote:
Originally Posted by johnblanker View Post
It was around 70 degrees inside this past weekend, outdoor around 75. The temperature in my attic hit 100 degrees. Is this normal?

We had a new roof put on last September, a "rip" not a re-layer. The roofers suggested I go with an attic fan since the current setup used an attic fan. So he installed a new attic fan and set the thermostat to 95 degrees. My roof has 2 gable louvers on each side and only the front has soffits- Another reason for going with the attic fan over a ridge vent. I'm not sure that the front soffits are functional for air intake.

I called the roofer and he sent someone to pull back the insulation that might be blocking the air intake from the soffits. This did not help.

My concern is that it is not even summer yet and my attic is already getting up to 100 degrees. I'm not sure if this is too hot. Also I don't want the attic fan running 24/7 as it is pretty loud and wasting $.

Anyone have any advice?
Guess what? Attic was hot before new roof.
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Old 05-13-2014, 08:22 PM   #14
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Attic is HOT after new roof


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Originally Posted by johnblanker View Post
Well, the fan WILL be running most of the day throughout the entire summer. I'd rather not pay for that.
Guess what?

Your fan will run most of the day throughout the summer even if you add soffits and increase ventilation.
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Old 05-14-2014, 10:52 AM   #15
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Attic is HOT after new roof


+1

Make sure you have enough insulation and turn the stat up.

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