How do I rough-in a ceiling service cavity before inspection and insulation?
My addition that I am building has 9 foot ceilings, but I want 8 foot ceilings in the bathroom and I want to keep the two bath ventilation fans and the can lights inside the building envelope. So, I decided to create a soffit that essentially covers the entire ceiling (or a service cavity, I’m not sure what it would be called). The OSB attached to the bottom of the ceiling joists and around the top of the walls will be caulked and taped to create an air tight seal. Then, after inspection and the insulation is blown in, the walls and lowered ceiling get dry wall (air-tight dry wall, of course).
My problem is in how to build this before the insulation goes in because I have to have an inspection before that happens. If I do it as shown in my drawing, will the insulation installer still be able to blow cellulose in behind the OSB that is attached to the exterior walls?
Is there a better way to do this?
GBA Detail Library
A collection of one thousand construction details organized by climate and house part