I am designing right now and not building. For some house designs, I prefer the main entry and any porch entry/exits to be such that a stone-paved floor finish, outside, is just below exterior door thresholds. There will always be a generous roof overhang above, or a porch or portico, or porte cochere. That means we will bring the foundation wall higher at those elevations with entry doors where this occurs, and thus will want to hang the floor deck frames from the mudsills, where joists are perpendicular to foundation walls. See the attached detail. The question I have is about the top of the ICF wall, at the inside edge. A taper top block with both edges tapered (not all manufacturers have this) gets better bearing toward the edge. Is this what to do here? Or instead, should a ledger be used, that sits up 1-1/2" higher than wall, for the joists to be hung to? What is your recommended detail?

Add a ledger to the face of the ICF and fasten as required (ICFLV or AB's). What you have drawn will not fly if you are designing in siesmic D1 as stated in another thread.

Thanks for the reply, Chris. It looks to me, after digesting some of the spec info at strongtie.com, that if my anchor bolt placement (1/2" dia. bolts) per a mudsill situation needs to be 24" oc min, that the ICFLV spacing should be 48" oc min.

How do you interpret?

It needs to be job specific, the Simpson tables are not acceptable in my area an engineer must calc and stamp all structural drawings. The other thing we end up adding as well is a PAI28 every 4' o.c. fastened to the joists to tie the building together.

I have placed the Simpson hangers as close as 8" o.c in some cases, makes for a real challange when placing hangers!!!

Gene,

I agree with Chris for these reasons. When you place a floor diaphram inside of the concrete wall you solve so many issues with the floor wall connection and a cantilevered vs restrained retaining wall below. With the floor inside of the wall your engineer can call that a fully restrained wall below and can reduce your footing size,wall thickness and rebar schedule. Not to mention the whole issue of insulating your rim joist.

ICF Contractor

PS Chris we use PAI28 sometimes but only in areas with wierd loading or if we have an inexperienced concrete engineer but 4' is typical.