By 'ICF construction', do you mean stick-frame with foam insulation sprayed into the cavities? If so, install conduit. ICF generates heat when the two components react and it can damage cabling if the foam is thick enough or the reaction is too strong. ALWAYS leave yourself a path for future changes- burying cables in this kind of construction can really bite you in places where you don't want,/need to be bitten. Unless you like that kind of thing.
Also, if the cable is going over 50', you should install some kind of junction box that allows pulling from the feed end and the conduit should be large enough to allow you to have enough space inside. Standard practice is to fill it to 65% of its volume; cable needs more space (friction increases at those places) as it bends and trying to pull more than 50' can put too much stress on the cable- Cat5e allowable maximum pulling strength is only 25 pounds.
The thing I have learned over the decades of installing cabling and equipment- ALWAYS worry about the cable and never think that it can't be damaged by someone else who's working on the project. Make it difficult to damage and if possible, pull it after the drywall is up (through your conduit) but make sure the conduit hasn't been damaged. If it is damaged, that requires repairs and the cost is charged back to whoever caused it.