[Greenbuilding] Question about attic insulation

[Lynelle Hamilton]

Thanks, Jeff. I've never used open cell foam or indeed any foam in an attic space, so had no idea it was advantageous at all.

On July 6, 2018 11:45:10 AM EDT, Jeff Martin <jeff at open2learn.ca> wrote:
>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
>
>⁣Sent from BlueMail ​
>
>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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