I am finishing up my icf house and am starting on the attached garage.  We have decided to make the garage a two story garage, garage on bottom family room on 2nd story.  The house and the garage will share a common wall, which is icf, this is the wall the floor joists of the garage will be attached to.  What would be the best method to attach a ledger board, since this 2nd story garage came to be after the house was up, there is nothing embedded into that wall to tie the ledger to.  I was debating on using 3/4'' wedge anchors to fasten the ledger.  But am not sure what would be best

wedge anchors will work.. but 3/4" seems overkill.. we used 1/2 and 5/8 on some pretty long spans.. you'll have to do some homework on the spacing, I know when we built the IRC showed how many were needed and what size depending on spans/stories.  Be sure to remove the stryrofoam.

I use 5/8 Hilti threaded rod spaced around 24", drilled and epoxied into the ICF wall. Then use a spacer for each bolt and your ledger is set. There is two types of Hilti "setting" epoxies, one 30 min and one 8 hrs!

Just check the Hilti charts to determine your allowable loading. Although 1/2 loads in shear ok, it does not do very well when there is 2+" of foam behind the ledger; that is why I prefer 5/8".

Check carefully your loading conditions!

jim, if I am understanding you correctly, you do not remove the foam, but use a spacer behind the ledger.

Sfair,

You will need to remove the foam the reduce the concentric load on the anchor. Threaded rod is not meant to take a concentric load. You need to have solid contact between your ledger and your wall. Also depending on the seismic zone you are in, the rebar schedule in the wall, and the load you are carrying will dictate the anchor used and the spacing.

ICF Contractor