Basement air gap between CI and framing – GreenBuildingAdvisor

We are redoing a basement. We ripped out the old furring strips, vapor barrier sheeting, and the fiberglass underneath. The fiberglass was seperated from the concrete wall with cross-strapping, but there was a small leak which required us to rip out a wall. We are taking the opportunity to redo the whole thing. The basement ceiling is spancrete, half of which is the garage and half is a living room (above spancrete).

We are not the original owners, so we have no idea if the exterior wall is insulated, but we assume it is not. We are unable to unearth it because of the concrete driveway in the front. The current plan is to just insulate from the inside. The leak has been addressed and its otherwise very dry. All the furring strips were in good condition, bone dry after probably 15-20 years (maybe more).

We are planning to follow the plans outlined by GBA for the new basement wall.

Three Ways to Insulate a Basement Wall

[concrete wall][4 or 5 inches of CI polyiso][1 or 1.5 air gap] [2×4 stud wall,drywall]

We do not plan to use any batt insulation instead relying only on the CI insulation against the concrete wall. The polyiso is left over from another remodel we finished, and since we have so much of it (we have a lot of foil faced 2″, 2.5″ and 4″ polyiso), we thought we’d use it here. The air gap was originally planned because we want to have future access to run rather large conduit without notching the studs. Is this air gap going to be a problem? Do I need to worry about convection looping?