Hi, My last block (top row) will have to be cut in the middle to set attic joists on top of that wall and get 8' ceilings. What you think about hanging attic floor the way first and second floor hangs of the ICF wall and use that space (uncut block) to fill in with blown-in insulation? I like this idea for the reason that I could better seal the attic however this most likely will cost me more for all the additional LSL's and hangers. But is this structurally allowed? The rafters would not be connected to ceiling joists. The joists will be connecting walls just few inches below? Thank you.

I would think each county or state jurisdiction may allow or not this application. If you have a top plate anchored to the concrete inside the block I would think they would allow that procedure. It seems a little costly if you are cutting the blocks in half if the blocks are reversible yo could get 2 out of one also the hangers would be more. If that were the case then maybe you could use the saving for spray foam instead of blown in insulation which would fill in that area without raising height

Not sure if this is the same thing that I do. I've written about this on several occasions . You use a raised heel truss and instead of placing it on the top of the wall you set between the icf walls and anchor it on top and between the walls using Watkins hangers. No top plate needed.

I do what Smartwall said. It works great.

Hi,
Does anyone have more information on this, ideally picture or drawing too?
Is this only working with pre-manufactured trusses? Can this be done with joist structure?
When I google this I could only find explanation for pre-made trusses with 2x2 or 2x6 construction. I have hard time picturing this with ICF and I think I will have even harder time explaining this to my draftsmen.
Thank you.

https://www.google.com/search?q=Watkins+hangers+icf&biw=1451&bih=839&source=lnms&tbm=isch&sa=X&ved=0CAcQ_AUoAmoVChMIhNi99eySxgIVBTaICh1zSgAO

Cool idea....what is the per hanger cost? Thanks

I don't have any pictures since my computer crashed. It's actually pretty simple, it would have to be if I thought of it. Instead of finishing the wall at a certain height and capping with a PT plate, you increase the height and use the same hangers that you use for your floor system. In this case I use Watkins hangers to hold the trusses. I can't see it working with site built rafters. I haven't been on a job in 15 years that has used site built rafters. The system came out of a desire to use 4" icf for above ground walls. Some people don't like the extra thickness. So why not use a raised heel truss, make the icf wall a little higher and take advantage being able to use the heel as a diaphragm between the walls and not on top. You can anchor the truss between the walls on top. The other point and this goes back to my insulation background. Why not install the ceiling insulation against the icf wall instead of on top of it. As I posted before R-60 celly is about $1.20 per sq ft compared to $1.25 per bd ft for PUF. The hangers cost about $13 per plus shipping depending the hanger that you use. Easier to use and cheaper that the Simpson 2 piece hanger that requires a band joist and separate joist hangers. It's like the mono pour system that I developed, once you use it you won't do it any other way

Thanks to everyone for their explanations, especially you smartwall.

The part that I could not envision before was how to connect joist with rafter but as smartwall said this is not done with site built rafters only with raised heel trusses.
Everything makes sense now.