Attic Insulation - Replacing Fiberglass Batts With ROXUL? - Insulation - Page 3 - DIY Chatroom Home Improvement Forum
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Old 01-04-2015, 09:28 PM   #31
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Interesting article. That finally shows that I am not driving myself crazy for no reason. It seems raised heel trusses or extended bottom chord trusses are the smart option. Each one will be more costly. I believe extended bottom chord would be cheaper.

You're suggesting to use at least 2" of poly iso rigid foam along the top plate, notched for each bottom chord that rests on the top plate. I understand that, since there will be very little room after accommodating for a 2" air channel for the venting process. Curious as to why you suggest XPS or EPS next after using the poly iso for the top plate?
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Old 01-05-2015, 10:21 PM   #32
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Mainly because of price. Be certain to air seal first, before any rigid insulation.

VitoB, any other questions after your thread was hi-jacked....?

Gary
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17,000 dryer fires a year, when did you last clean the inside of the dryer near motor or the exhaust ducting?
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Old 01-06-2015, 10:06 AM   #33
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Originally Posted by Gary in WA View Post
Mainly because of price. Be certain to air seal first, before any rigid insulation.

VitoB, any other questions after your thread was hi-jacked....?

Gary
Actually maybe just one last question if that's OK with you. I wasn't able to post them previously due to some issues posting pics.

I was just wondering what you think of the attic chutes I currently have:

http://www.diychatroom.com/albums/th...?dl=1417031484

I still can't post the full size pics so I'm sorry if it's hard to see.

The OSB panel is kind of sitting in there loosely between those 1x3s, it is only held in place by the fiberglass batts over the top plate.

There is also a large gap between the 1x3s and the rafters.

When I cut my rigid foam blocks they need to fit nice and snug from rafter to rafter correct?
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Old 01-06-2015, 08:09 PM   #34
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The OSB is rather poor as it won't direct all the cold air, some will degrade your FG by up to 40% by wind, pp.5; https://www.google.com/url?sa=t&rct=...,d.cGU&cad=rja

Yes, cut the FB between the wood rafter/ceiling joists, some notching is involved, lol. Been there-done that. The OSB is also compressing the insulation lower total R-value. Cellulose will form a crust on top that air seals fairly well (if not disturbed later), but you will air seal before insulation as it is more important than insulation; http://www.google.com/url?sa=t&rct=j...QNHKwJ2BS-kZEw

Easy to find the air leaks from the dirty FG, great filter as in furnace filter.

Gary
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17,000 dryer fires a year, when did you last clean the inside of the dryer near motor or the exhaust ducting?
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Old 01-06-2015, 08:29 PM   #35
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Quote:
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The OSB is rather poor as it won't direct all the cold air, some will degrade your FG by up to 40% by wind, pp.5; https://www.google.com/url?sa=t&rct=...,d.cGU&cad=rja

Yes, cut the FB between the wood rafter/ceiling joists, some notching is involved, lol. Been there-done that. The OSB is also compressing the insulation lower total R-value. Cellulose will form a crust on top that air seals fairly well (if not disturbed later), but you will air seal before insulation as it is more important than insulation; http://www.google.com/url?sa=t&rct=j...QNHKwJ2BS-kZEw

Easy to find the air leaks from the dirty FG, great filter as in furnace filter.

Gary
Please don't tell me I need to replace my existing chutes.

Very interesting articles, thanks again for sharing your knowledge and expertise.
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Old 01-08-2015, 07:25 PM   #36
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Alright, I won't tell you to replace your baffles...... any other thoughts?

Glad we could help.

Gary
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17,000 dryer fires a year, when did you last clean the inside of the dryer near motor or the exhaust ducting?
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Old 01-09-2015, 08:33 AM   #37
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Alright, I won't tell you to replace your baffles...... any other thoughts?

Glad we could help.

Gary
I should be good to go as soon as the weather warms up a bit up here in Montreal, it's been really cold lately.

Thanks again Gary.
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