Hi, I have conventional drawings that I trying to convert to icf. My flooring system using lvl lumber with central lvl beam. I can't find code approved connecton or hardware how to attach lvl beam to icf wall. Is it approved by the code at all? Or with ICF only steel cental support beams should be used? With steal there is no issue at all: beam just going into the concrete or pocket should be done. But what to do with lvl - is there any possibility to use, or I need to switch to steel beams only? I saw also examples with on site poured concrete central support as well, in case I will fail to find lvl connection, probably it's another way to go instead of steel beam.

No. You'll want to attach ledgers to the walls and hang the joists off the ledgers normally.

Hit YouTube and look up "ICF Ledger".

There's a couple ways to attach the ledger to the wall. Anchored with J-bolts pre-pour is the simplest.

https://youtu.be/iw3bzAeZ2Kk

Simpson makes a ledger hanger system where you put a plate system into the wall, then hang the ledger from the plate.

https://youtu.be/fVntvXMS7zk

https://www.strongtie.com/concrete_miscellaneousconnectors/icfvl_system/p/icfvl

https://youtu.be/-sRu6ixTD4QZ

There's also Lavann hangers as well. The hangers are directly attached to the wall pre-pour with only a temporary ledger to keep them from moving during the pour.
Afterwards you just remove the temporary ledger and drop your joists in. Stay-Fast markets a similar solution.

https://youtu.be/38Sam16wJjw

Thanks Dilettante, but issue is in central beam installation, please refer to this video at 4.14:
https://m.youtube.com/watch?v=PjaozkxajmQ
If i understood correctly, they just put lvl beam into the pocket? but is it not code violation: requirement is that lvl can not contact with the concrete. by my understanding, some metal hanger should be used in this case? or lvl can be wrapped with something and put into the pocket directly after it? I have concern about this connection type: concrete will make wood rotten: especially lvl afraid water much worse, than regular wood.

Basically you're looking at pressure-treated for ledgers. This way they can maintain the contact with the concrete.

With your LVL, you build your beam pockets and pour in place.
You can use felt on the end.
You can use pressure-treated shims.
You can flash out the beam pocket with metal or use a fluid-applied membrane (or both).

For fluid-applied, look at Zip Liquid Flash, Prosoco FashFlash, Polywall, Tyvek Fluid Applied, etc.
Not only the pocket, you can liquid-flash the end of the LVL as well.

Then just take a bit of extra care inserting the beam so you don't penetrate the barrier...

Oh, another option you could use.

Depending on the type of form manufacturer you're going with, see if they have a brick-mold form.
Then use it on the inside. Provides a nice concrete ledge without needing to hog out a significant portion of the wall.

https://www.bimobject.com/en-us/buildblock/product/brick-ledge

If it's sitting free of a pocket, all you need is flashing or a steel plate beneath it on the ledge. Only one exposed surface in contact.
You can stabilize the LVL left-to-right with wood blocking. And once the joists are in place, they'll stabilize the beam themselves.