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Discussion Starter #1 (Edited)
How should this upper section of the exterior wall be sheated in preparation for a thick bed of insulation in the side attics around a finished attic room?
Exposed Interior Under Eaves.jpg

Under-Eave End-.jpg

I am in climate zone 5A (SW Michigan)
 

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Discussion Starter #2
Wall Assembly To Be Sheathed and Insulated in Climate Zone 5A

Here is a drawing of the wall assembly:

Brick-faced-Wall-Assembly-2.gif

I think that I need to sheathe above the brick and up to the top of the joists before I install insulation in the side attic floor. How do I best do this in climate zone 5A?
 

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Discussion Starter #4 (Edited)
Those joist bays need to have rigid blockers installed in them and them foam sealed from the sides and top. Make sure there is a proper vent space to allow the soffit air to draft up along the roof line and into the attic.
Thanks, WoW. I plan to block the joist bays with Foamular 250 both at this outside wall and at the point where the joists go under the finished attic room:
Under-attic-room-floor.jpg

I am considering sheathing the upper part of this outer wall with a continuous air barrier of sealed Owens Corning Foamular 250. This sheathe would start just above the level of the brick cladding. I would retain the vertical gap between the brick cladding and the fiberboard so that the original construction of the first floor below would not be altered. I would allow air to continue to enter here.

The sheathing above the first floor would provide a barrier up to the (Provent) rafter vents. I would insulate up to to above the joists and then block both between the joists and up to the rafter vents on the inside of the wall. Is this overkill?

Also, In order to create an acoustic barrier between the finished attic room and the family room below, can I fill the joist bays below? There is electrical running through the bays. It's rubber, 2-conductor cables into j-boxes. It is unlikely that I will be able to replace the wiring below this floor.
 

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