My house was built in 1951, brick cladding on the main floor and three large wooden gables above. I'm getting ready to air seal the attic, and I notice at all the gable ends of the attic, where the rafters end, there's a drop of about 18 inches, to what looks like the top course of the exterior bricks. There appears to be a space of about 1/2 inch between the inner side of the bricks and what looks like the outer edge of the wall sheathing.
Now, this space needs to stay open to the attic, correct, so water vapor from the brick can escape?
I'm planning to have cellulose blown in to the attic to a depth of 13 inches, but I need to make sure no cellulose goes down into those spaces, right? So I need to put some type of barrier that blocks the cellulose, but lets air pass?
Re: Air sealing at gable ends, with brick cladding?
I think you could block the top the space is drain plane and you should have weep holes at the bottom of the brick. You want a fire stop from the wall to the attic and that would be a perfect chimney for the wall fire.