French door in low walkout basement
I have a low clearance walkout basement. The max height is 89" from concrete to floor joist, minus the double top plate I have the usable height of 84.5". The wall is a 2x6 construction and currently have a 36x80 metal door in place with low height 2x4 header and 2x6 king and jack studs. Would like to put in a standard 72x80 patio door. The wall is load bearing.
I'm not familiar with the load sizing but I'm sure I need at least 2x6 double header. But I don't have enough clearance. What are my options? Could I use some sort of I beam (metal) header?