*
I own a one year old Cape Cod style home with a finished second floor, including two dormers. There is R-30 insulation on the attic floor, a continuous ridge vent, and continuous soffit vents in the front and the rear of the house.
I am concerned that I am not getting enough ventilation, for the following reasons. (1) The roof rafters appear to be darkening, with a grey and black discoloration appearing on the sides of the rafters. Is this mildew?(2) The gap on either side of the 2×12’s that form the top of the roof line is only 1/2″ to 1″ wide; I was told you need to have at least 2″ on each side of this ridge rafter in order to ventilate properly. (3) After putting a digital thermometer inside the attic near the peak of the roof, the attic temperature is consistently running 30-40 degrees higher than the highest outside air temperature. During a recent 90 degree day, the attic temp was 130 degrees. I have read that with a properly functioning ridge vent, the temperature difference should be no more than 10 degrees.
Do I have a problem? If so, what should I do since I’ve read bad things about modifying ridge vent systems with add-ons such as electric fans, gable vents, etc?
Replies
*
I own a one year old Cape Cod style home with a finished second floor, including two dormers. There is R-30 insulation on the attic floor, a continuous ridge vent, and continuous soffit vents in the front and the rear of the house.
I am concerned that I am not getting enough ventilation, for the following reasons. (1) The roof rafters appear to be darkening, with a grey and black discoloration appearing on the sides of the rafters. Is this mildew?(2) The gap on either side of the 2x12's that form the top of the roof line is only 1/2" to 1" wide; I was told you need to have at least 2" on each side of this ridge rafter in order to ventilate properly. (3) After putting a digital thermometer inside the attic near the peak of the roof, the attic temperature is consistently running 30-40 degrees higher than the highest outside air temperature. During a recent 90 degree day, the attic temp was 130 degrees. I have read that with a properly functioning ridge vent, the temperature difference should be no more than 10 degrees.
Do I have a problem? If so, what should I do since I've read bad things about modifying ridge vent systems with add-ons such as electric fans, gable vents, etc?