[Greenbuilding] Question about attic insulation

Jeff Martin jeff at open2learn.ca
Fri Jul 6 10:45:10 CDT 2018


Lynelle, 

>From your description, the area is already well air sealed and 16 inches or so of cellulose should provide fairly good resistance to air infiltration where there are small leaks. I don't see any advantage to using foam, especially at twice the price. 

Jeff 

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On Jul 6, 2018, 9:03 AM, at 9:03 AM, "Lynelle A. Hamilton" <lynelle at lahamilton.com> wrote:
>Hi All,
>
>Again, I ask this group for advice!  Am insulating an attic space. It's
>
>720 sq feet. The roof is a north facing slope and gets a lot of wind
>all 
>year, including winter. There is a 48 ft ridge vent and hand-built 
>vents. Location is Greater Toronto area, so definitely a heating
>climate.
>
>We've installed vapour barrier, in anticipation of using blown in 
>cellulose to attain R60. We've been careful to seal all openings, 
>including the area around the access hatch and there are no pot lights.
>
>The one duct that runs in the attic (bathroom vent fan) is insulated.
>
>I've had two contractors (both in the field for some time) suggest
>using 
>open cell (1/2 pound) foam, as it will fully seal the attic area and 
>allow less heat, condensation, etc. At R60, it's about twice the price 
>of cellulose, though.
>
>I've no concern about the ability of either contractor to appropriately
>
>install.
>
>I've pored through all of John Salmen's videos and articles that I can 
>access about best approach in this setting but confess that I'm no less
>
>perplexed.
>
>Any thoughts, folks?
>
>Thanks in advance!
>
>Lynelle
>
>
>
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