For a 36″ door, you will need rough opening to2 inches wider 2-1/2″ taller than the actual door size, so, if you are installing a 36″ wide and 80″
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For a 36″ door, you will need rough opening to2 inches wider 2-1/2″ taller than the actual door size, so, if you are installing a 36″ wide and 80″