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Old 02-07-2013, 02:19 PM   #1
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insulation baffles


getting ready to blow in my attic
have some conflicting question to ask
do i need to build a baffle to go around my chimney flue?
i will be using blown in fibreglass
the chimney flue is only being used for my hot water tank
i was told by one contractor i dont need to as it doesnt produce much heat
thanks

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Old 02-08-2013, 07:32 AM   #2
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insulation baffles


bump!!

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Old 02-08-2013, 09:35 AM   #3
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insulation baffles


Yes you do need it, and needs to be metal. Use metal and fire rated caulk to air seal around it.
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Old 02-10-2013, 08:46 AM   #4
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insulation baffles


so yah i was up there and cranked up the hot water tank, the flue never even changed temperatures
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Old 02-11-2013, 06:18 PM   #5
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insulation baffles


You won't feel the brick change temps esp. if there is a flue liner...
1.The idea is to air seal the sides of the chimney to stop your (already conditioned) room air from going up and out. (save money)http://www.finehomebuilding.com/PDF/Free/021105092.pdf
2. It will stop a fire at each level (required per building codes minimum) instead of a basement/ground floor fire going directly to the attic, burning it down while the main fire is burning up; with you (hopefully not) in the middle. (save money)
3. It will stop contributing to the natural "stack effect" (save money); http://www.wag-aic.org/1999/WAG_99_baker.pdf
4. It will stop damp, humid basement/crawlspace air from wetting the roof framing, rotting, forcing replacement (save money)
5. If someone at a later date (after you move) adds another appliance, possibly wood-burning- to exhaust the gasses, it will be "to Code"- if all else is in order. (save money)
6. It will stop any convective loops next to the chimney, robbing your insulation of R-value.(save money)
7. It will stop rodents from basement/crawl to attic, to nest in your new insulation that you now need to pay an exterminator to remove. (save money)

Good advice by HomeSealed! Did I mention "save money"? Lol.

Page 16, #8--- pp. 19; http://apps1.eere.energy.gov/buildin...ing_report.pdf

Gary
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