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Old 07-25-2019, 06:25 AM   #16
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Re: Adding insulation to attic


Dave, just to note, some air leaks originate in the basement or crawlspace and if accessible, like around a chimney or plumbing, some air leakage reduction can benefits can be achieved from down there.

As you learned and many future readers need to understand, air seal before burying the attic in insulation. But R-60 is nice.

Bud
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Old 07-25-2019, 11:34 AM   #17
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Re: Adding insulation to attic


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When I bought my house back in 1980 (new construction) there was a minimum amount of blown in insulation in the attics. I'm guessing maybe R15 in some areas and R11 in others. It was not distributed evenly and there were some voids as well.
Voids have a disproportionate impact on on heat loss so you can see major savings getting rid of them.

Don't get me wrong - adding is always beneficial, but sometimes there are bigger savings to be had elsewhere.

Every house is going to be a bit different.
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Old 07-25-2019, 12:59 PM   #18
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Re: Adding insulation to attic


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Originally Posted by Bud9051 View Post
Dave, just to note, some air leaks originate in the basement or crawlspace and if accessible, like around a chimney or plumbing, some air leakage reduction can benefits can be achieved from down there.

As you learned and many future readers need to understand, air seal before burying the attic in insulation. But R-60 is nice.

Bud

Agree. Before I added the last batch of insulation in the upper attic I found a pretty large area around the furnace chimney chase coming from the lower level which is 4' below grade. I can't imagine the amount of heat that went up into the attic over the years. I took some sheet metal and cut it to fit around the chimney and sealed it with red heat resistant caulk.
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