We have an ICF addition in southern Ontario started that has dimensional errors made in both footprint and elevation. The basement was not excavated to the proper depth making the main floor level too tight to the basement floor to put proper staircase. The stepped footing joining to our existing stone foundation was done improperly, many errors of joist hanger and bolt placements and finally the roof is higher than planned (truss construction) so the fascias do not line up and the peak is taller than our existing house. How do you retrofit ICF walls to change floor levels, such attaching fasteners to walls etc.

dwl - if you are asking how to attach a ledger to an ICF wall after the fact, there are several ways. Is it fair to assume you have lvl ledgers with joist hangers carrying I-joists? What we would do is calculate the amount and size of anchor's needed to carry the load (Hilti or equal) lay them out on the ledger (these should be staggered up and down). Put the ledger in place temporarily and drill through it with the right size Hilti drill bit for the anchors to be used. Then remove the ledger and scarf out a bit of foam around each insert and hang a 1 1/2" x 1/4" hss (1 1/2 square metal tube with 1/4" wall thickness) that is 2 1/2" long (or however thick the foam is) than slide the ledger back on over the inserts (bolts) and tighten the nuts. Put on you hangers and drop in the joists. The metal spacers prevent the foam from crushing and stabilize the ledger to insert connection. Of course this would be the time to mention that you should consult with an Engineer having knowledge of ICF construction. Good luck with your project.
Bob
p.s. this is not really an ICF building mistake. It is simple human error.

Thanks for the feedback. I agree that it is human error, the ICF is only a more difficult material to remedy when the unfortunate problem of human error occurs. I am trying to find an engineer in our area that is sufficiently knowledgeable in this area but it is presenting a major problem in itself. The joist hangars are Simpson strong tie directly embedded in the ICF wall and the I joists have been moved to the extreme limit of the hangars. There are no lvl ledgers provided. The rim joists are also attached with bolts at the extreme extent of the ability to connect, within 2 inches of the edge and some completely missing altogether. I understand your approach to remedy this and will keep it in mind as we attempt to correct the problems.

Here is one retrofit product that works well - http://www.icfconnect.com/retro.htm

Not sure what type of floor system you have, but if it is an open web, for instance, you may be limited to a certain length (assume this length would include allowance for ledger/LVL). This system works without any ledger board. You need to have a floor system that has the extra length to allow for some cutting (2x10, I-joist, etc.)

The FERO FAST steel angle ledger system might could be adapted to support your floor system at whatever height you desire.

http://www.ferocorp.com/pages/fast/fast.html