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You should use a 2x6 for the interior casing so as to have the room to mount the door track and allow for adjustment space. In your case you may need to use a 2 x 8 and rip it down to fit. Your objective is have a solid jamb facing the exposed wather sides.



I will have 3 1/2" 2x4 wall, plus 3/4" for sheeting. That gives me 4 1/4" width total, which means I will have 1.25"

4.25 + 1.50 (for the casing) = 5.75
 
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