Commonly used methods

Method 1: Build wooden stucco bucks (fit inside formwork)

Method 2: Build wooden flanged bucks (fit over formwork)

Method 3: Use a plastic buck channel

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Comments:

Rob Dykeman- ICF Information
Phone: 800-857-2324
Email: dykeman@sugar-river.net
I recommend you build all bucks prior to laying blocks to expedite construction.

Jean-Marc Bouvier -  J-M Bouvier Carpentry
Phone: 519-369-6989
Email: jmbouvier@sympatico.ca
I use a combination of both illustrations. I rip the lumber to butt up to the inside of the outside form edge and to the outside of the inside form edge, with a 2x3 spreader on the inside only. I then staple sill gasket or 6 mil poly around the buck and then add double headed nails for the concrete to hold the buck. This method keeps the integrity of the insulation on the outside and still allows a nailing edge on the inside.

Rick Hansen - Reddi-Form Northwest
Phone: 406-587-4903
Email: reddiformnw@mcn.net
Consider using masonry unit windows. Then simply glue foam to the icf to act as a bulkhead, after the pour just slip a saw between and remove the foam, attach the masonry unit, and instead of using an extension jamb one can apply sheetrock in the opening with either a square or bullnose corner application where it meets the wall shetrock. Nice look in many contemporary homes where a wide wood trim is not part of the design criteria.