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Old 08-31-2014, 08:49 AM   #1
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Add insulation to the attic?


Question: Should I add insulation to the attic?

One story ranch in Northern WV built in 1960. In USDA zone 6b. 2x4 studs construction. Unfinished attic with insulation on floor of attic as follows:
R-30 fibreglass insulation between the 2x10 joists
R-19 fibreglass insulation on top of the joists laid 90 degrees to the direction of the joists so that all joists are covered by insulation

Question: Should I add more insulation to the attic, for example an additional layer of R-13 or R-19, or would that be a waste of money?
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Old 08-31-2014, 09:17 AM   #2
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Nope you have R-49 which is code.
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Old 09-01-2014, 06:16 AM   #3
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Waste of money.

Spend the time and energy on air sealing if you want to. That is where you payback will be now.
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Old 09-01-2014, 06:30 AM   #4
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At your current attic insulation value(R49). If your ceiling is 1,000 sq ft. When its 0 outside and 70 degrees inside. Your ceiling is losing 1,428 BTUs of heat. If you increased your attic insulation by R19 to an R68 value. Under the same temp conditions, that 1,000 sq ft ceiling would then lose 1,029 BTUs of heat. So no pay back in just adding more attic insulation.

As said earlier, seal your home better. It will help keep the indoor humidity lower in the summer, and higher in the winter. Along with keeping the house warmr in the heating season and cooler in the cooling season.
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