Rough openings in ICF walls are tight and I am unable to get X18 to handle the specs

[GeneDavis]

Windows and doors are to have 1/4 inch RO clearance and Chief won't let me get that tight.  Where is the minimum clearance set?

[Dermot]

I believe X18 works the same as X17 with regards to rough opening sizes.  If your door size excludes the jamb, your rough opening needs to have enough space for the jamb.  You can either remove the jamb, make the jamb smaller, change the door size such that it includes the jamb, or specify the rough opening in terms of how much clearance you want.

 

[robdyck]

Not sure if you mean 1/4" overall or 1/4" each side, but either way, Chief models those correctly for me, but only for windows. Drywall is directly up against the door jamb regardless of the rough opening. 

 

DOORS: