Cellulose Drying Potential / Vapor Retarder
I’m building a single-story 36×40 foot office next door to my house.
Here are the details:
Double-stud walls (2×4’s, total depth of 9.25″ before sheathing.) Sheathing will be Zip panel, with taped seams.
The building sits on posts. We installed PT plywood to the underside of our 2×10 floor joists. The subfloor is Advantek. We plan to dense pack this floor and the walls with cellulose.
The roof will be 10″ deep I-joists, sheathed with Zip. We also plan to dense pack the roof.
So here’s my question: Is it safe to assume that the cellulose will dry to the interior of the building? Or should I install a smart membrane (Intello?) to the inside of the walls and ceilings before blowing in the cellulose?
I’m planning to tape all the seams in the Zip panel. I was also going to spray foam or caulk the seam where the I-joists land on the top and bottom plate, and anywhere else it seems like we could have significant air infiltration.
So… go the Intello route? Skip it?
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