My house built in 1990 has loose insulation about three inches, but that's a guess. I believe code then was abour R32. I plan to install a new roof next summer and have a ridge vent put in. The attic is much too warm in summer, as I do not like to crank up the air conditioner and contribute to coal generating pollution. I currently have two "whirlybirds" in place, but as I heard you say the bearings can squeak after the years. With this information, typically how much R factor is required and in plain english for someone like myself, that translates into a couple more inches of insulation?
Answer:
There is nothing wrong with at least R-40. In my attic I have about R-60 with all kinds of measures not to impede soffit venting. I also have a gable-to-gable baffled ridge vent and I more than doubled the ceiling drywall thickness. Yes, it keeps the fuel bills down.
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