Homeowner seeks joist insulation options for garage ceiling
Hi all. I know similar questions have been asked but I haven’t seen anything that quite hits my three concerns. Any experienced advice would be greatly appreciated.
We recently bought a small cape with a large attached two car garage in Vermont. I’m converting the garage into a semi-conditioned wood shop and we are also considering putting in a bed/bath in the attic over the garage (there is a lot of space up there). First thing will be to insulate and finish the ceiling of the garage (which will also be below the floor of the future bed bath). The joists, which are currently open to the garage side, were old solid 2×6’s 24 OC, but we’ve in preparation of these remodels we’ve added 2×6 LVL in between each to beef up the floor (per engineer specs). So now there is a joist 12 OC with tongue and groove floors on the attic side. There have been mice issues in the past from what I can tell. Though I know that they are hard to avoid in a garage in Vermont I at least would like to choose an insulation method that may not be easy for them to find a home. I’m also concerned about condensation forming between the two spaces. The garage shop should be pretty dry and cool, but the space above in the attic could be humid and warm if we decide to remodel for a bed and bath. There’s also the dust issue from the woodshop getting drawn into the space above. With those two considerations, what do you think are my best options for insulating between floor joists? One other caveat… I need to be able to do this myself so blown in anything is probably not going to be a viable option.
GBA Detail Library
A collection of one thousand construction details organized by climate and house part