Replies

1. 
   arnoldk | Feb 08, 2021 06:27pm | #1

   The attached assembly which did not attached with the original post.

   Arnold

   
2. Expert Member
   Michael Maines | Feb 09, 2021 09:00am | #2

   Arnold, your assemblies look reasonable to me at first glance. What climate zone are you in?

1. 
   arnoldk | Feb 09, 2021 11:51am | #3

   Hi Michael,

   I am pretty confident in the wall assembly but I just want other pair of eyes to have a look at it just in case I have over looked it. I'm in Zone 6 (Ottawa, Canada).

   Thanks,
   Arnold

3. Expert Member
   MALCOLM TAYLOR | Feb 09, 2021 11:55am | #4

   Arnold,

   They look good. A few small points.

   - You may want to extend the termite shield over to the slab to completely block potential access.
   - I'm not sure the exterior foam adds much for all the extra complication and expense. The wall will dry to the exterior much better without it.
   - Why a separate air and vapour barrier under the trusses?
   -The areas to clarify are how the wall intersects with what looks like a sec0nd floor (continuity of structural sheathing, air-sealing, etc), and the same at the roof.

1. 
   arnoldk | Feb 09, 2021 01:21pm | #5

   Hi Malcolm,

   Thank you for the feedback and I will try to clarify those on the drawing especially the intersection of the floor joist of the second floor.

   The exterior rigid insulation (ComfortBoard) was to help hold the batt insulation in the 2x6 cavity wall and to added more thermal break, especially at the floor joist and the sill plate where it will overhang by 6 inches.
   I agree with you there will be additional work and cost with this approach and I need to figure out a way to cover the bottom where the ComfortBoard and rainscreen will overhang the slab by about 4 inches.

   I included a vapor barrier because I am assuming the Ottawa building inspector is going to want to see one despite the fiberboard air barrier. If it's not needed and the inspector does not require it, I will leave it out and save the cost of the material and my labor.

   Thank you again,
   Arnold

1. Expert Member
   MALCOLM TAYLOR | Feb 09, 2021 04:16pm | #6

   Arnold,

   I should stress again they are minor things things I've brought up, and the walls and roof will work very well the way you have drawn them.

   You may find this blog by a past frequent poster here on GBA useful for how to detail walls with no exterior sheathing. http://ourhouseuponmoosehill.blogspot.com/p/details.html