10-14-17, 08:14 AM | #1 |
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Insulation
Church parsonage ceiling only has 1" of rock wool. NG heat.
Will soon add R19 or R25 batts or blown-in... What is your experience with blown in vs. batts? FG or cellulose blown in? |
10-15-17, 08:00 AM | #2 | |
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Quote:
By far, my favorite. -AC
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11-15-17, 11:47 AM | #3 |
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My vote is for cellulose. I like how it performs better the colder it gets vs fiberglass working worse the colder it gets.
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11-17-17, 09:27 PM | #4 | |
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Geo |
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11-19-17, 07:30 AM | #5 |
Supreme EcoRenovator
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Depends on the air sealing of the site to be insulated. If it's pretty airtight, cellulose is good to go. If there are leaks, roxul is the stuff you should use. It's not as dusty as cellulose and doesn't absorb moisture to a significant amount. Like AC said, it is very sound absorbing and will slow any air leak issues that may exist.
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11-20-17, 02:44 PM | #6 | |
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Quote:
You forget about or don't know how bulk insulation works. It's sole purpose is to prevent air movement in the insulated space thus eliminating convection heat loss. All bulk insulation materials have a higher heat conductivity than does air but this small additional conductive heat loss is more than offset by the elimination of convective heat loss in still air. Thus, bulk insulation in a sealed volume is only effective in reducing heat loss on a horizontal or upward direction, not in a downward direction, inasmuch as natural convection does not exist with downward heat flow. If not careful, one can learn something new every day. |
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11-20-17, 07:15 PM | #7 |
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Batts vs Cellulose
I did the blow-in cellulose in my attic 10 years ago. I have been disappointed in how much it settles over time (a lot), which I assume decreases its insulation ability. It is also very messy, if you have to go up there and do things.
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