36x80 prehung, what size rough opening?

Old 10-13-06, 01:27 PM
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36x80 prehung, what size rough opening?

I meant to check while at the store and completely forgot. I'm putting one into a shed I'm building, and I need to know what size to make the rough opening. I know it's 37.5" wide, but how high? Just add 1.5" to the door height so 81.5" ??

Old 10-13-06, 02:38 PM
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Prehung exterior doors that are 36x80 usually measure 37 1/2 x 81 3/4 to the outside of the frame. The rough opening for such a door would be 38 1/4 x 82 1/2.

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