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Old 11-28-2014, 08:49 PM   #1
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Improving attic insulation - mansard roof


Hi guys,

I am trying to improve the insulation in my attic. I live in Montreal, Canada our winters are very cold.

Currently the attic has 6 inches of fiberglass batts with some blown fiberglass over it and it doesn't look like they added enough.

I believe in my area they recommend a minimum of R50 for attics.

My mansard roof has a continuous soffit vent all around that was added later on, other homes in my neighborhood don't have it.

The air chutes are 2 feet long and made from plywood most likely by the contractor who added the soffit vent.

My plan is to suck out the blown fiberglass and add cellulose on top of it after sealing the top plates, electrical boxes and plumbing stack.

Do I need to extend the chutes to 4 feet before I add the insulation?

Thanks.

Last edited by VitoB; 11-28-2014 at 08:54 PM.
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Old 11-28-2014, 10:20 PM   #2
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You will need to extend them far enough to where they won't be blocked by the R-50.
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Old 12-01-2014, 10:30 AM   #3
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Quote:
Originally Posted by Windows on Wash View Post
You will need to extend them far enough to where they won't be blocked by the R-50.
Appreciate the advice.

Should I leave the fiberglass batts in there? Or is not worth the trouble of removing them?

My only concern with leaving them in is the knee walls. Ideally I would have liked to spray foam them first and then blow the cellulose on top of that.
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Old 12-01-2014, 01:49 PM   #4
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Blow over the top is fine.

Kneewalls work well when you cover the entirety of the framing with rigid foam and seal all the gaps.
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Old 12-06-2014, 03:30 PM   #5
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Excellent resource on building insulation


I can recommend an excellent book that not only covers interior building insulation but all aspects of building energy efficiency. It is called: "The Visual Handbook of Energy Conservation: A Comprehensive Guide to Reducing Energy Use at Home" by Charlie Wing. I cannot recommend this book highly enough for anyone looking to improve the efficiency of their building. It is literally packed with graphics, charts, and plain language explanations of how and why building insulation works
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