Concrete slab against untreated rim in garage - already installed

[MCC on Eng Tips]

A contractor called on a project I am not involved with, but I will help if I can.

On a house construction project, the Owner wanted the garage slab poured for zero entry to the house after plans had been submitted and approved with conventional construction. Foundation installer set up an untreated rim along the interior wall to the house. County turned them down for untreated contact with concrete. This is all already installed. I can not find any modifications that would permit this to be constructed. I understand that all wall framing is up as well.

I would like to reach out and see if anyone has experienced this before or has come up with a solution to rectify the problem short of destructive removal of the rim on the floor system.

 

[Nor Cal SE]

I'm presuming this whole area, both the garage slab and the adjacent portion of the house, are slab on grade? If for some reason they're not, such as if both are elevated over a basement/lower-level, then I would content the untreated contact with concrete would not be relevant since there would not be contact with the ground. But since you've stated that the contact against the house is against concrete, it sounds like this is all on grade.

Assuming the wood isn't holding up anything structurally, is the only consequence that it could rot and leave a small gap between slabs? I think you could make the case to the building department that this is not super critical, and/or you will monitor the condition.

 

[kostn]

Cut out the existing rim to prevent mould. Install pressure treated blocking between the joists to transfer gravity/lateral loads.

 

[XR250]

The slab ought to shrink a tad. Can you s slide some flashing down the gap?