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Do i need to seal the cavity of my walls from the attic

Do i need to seal the cavity of my walls from the attic

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  #1  
Old 02-16-14, 09:26 PM
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Join Date: Dec 2013
Location: Canada
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Do i need to seal the cavity of my walls from the attic

Hey Guys,

The cavity in my walls seems to lead up into my attic and is unsealed. I'm planing to insulate soon but it seems like i should seal of any attic air from air that is in the cavity of my walls? Or does there need to be an air pathway from the walls and into my attic?

For example what i'm talking about is that the walls in my second floor have drywall then insulation then brick, air gap then another brick. If you go up into the attic you can reach down a gap and feel the insulation. My plan is to seal this air gap off so i don't get cold air coming down that gap.

Is that a good idea?

I've looked at this post which doesn't totally apply but will read Vermont Efficiency document and see what they say.

What do you think?

cheers
oman
 
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  #2  
Old 02-17-14, 02:27 AM
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That path from basement to attic has been keeping your bricks warm and dry. Well, warmer, maybe not warm. When you change anything related to air flow or insulation you risk how the bricks will respond. Here is an article, more related to temperature than ventilation, but it will give you some insight.

IMO, the airflow from basement to attic is not good for your energy costs nor is it good for the attic, lots of moisture. So, yes the path needs to be addressed, I just can't judge from here what approach is best.

There is another poster, IBreakStuff who is dealing with a similar problem.
http://www.doityourself.com/forum/in...ass-batts.html

Bud
 
  #3  
Old 02-17-14, 06:33 AM
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Thanks Bud,

I'm PM'd Ibreakstuff and will see how he went with the sealing. By the way i didn't see an article on "temperature than ventilation", was there something meant to be attached?

cheers
oman
 
  #4  
Old 02-17-14, 07:23 AM
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Location: New England
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LOL, and the title of this article seems to apply to me as well:
BSI-047: Thick as a Brick — Building Science Information

I do get lost at times.
Bud
 
  #5  
Old 02-19-14, 09:44 AM
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Join Date: Oct 2013
Posts: 149
Oman, PM'd you back, but just to summarize: I haven't done the sealing yet since Great Stuff doesn't cure too well in cold weather - you just end up with a wet sticky mess.

That extra time has allowed me to move back to being on the fence about doing it though. Energy efficiency pros tell me to do it, air quality pros tell me not to do it, & the building science community doesn't seem to have a clear picture on what to do when it comes to load-bearing masonry when you're talking about buildings from the mid/early-20th century.

So frankly....still searching for other opinions before going through with it.
 
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