I have a room to insulate. The exterior ceiling and walls were insulated prior to interior finishing, however, the floor was never insulated.
The room is a second floor porch (on posts). The floor joist are exposed from underneath. The subfloor was laid on the joist, and I can only assume no vapor barrier was placed between the subfloor and finished floor.
Before I insulate, I'd like to create a vapor barrier. I can use "Faced" insulation and install it paper side up, but the integrity of the barrier will be suspect .
My question is; Is there a nice way to create that vapor barrier? Is there a better alternative?