Sounds as though you have done this before, and if you plan to breed in the future, I would highly suggest this great website: Color Calculator
Its very easy to use, you would just choose 'Blue roan' for sire, and leave the second box under sire to 'solid' and then dam would be chosen to 'sorrel/chestnut' and the second box next to dam would be frame overo you hit 'continue' and since you don't know there specific genetics, hit the 'Calculate button, and wala! You have the percentages that are scientifically proven :)
And its free!
Good luck :)