I am installing a slider on the back wall of a walkout basement. The door is standard 72"w x 80"h vinyl. My problem is this. The wall is an exterior wall and of course is load bearing. There was an existing roughly 90" picture window in place which i removed and framed back in. This had the standard double 2x10 sandwich header above it. Measurement from basement floor to first floor joists is 85". This only leaves me ~5" to play with for a header to span 6ft. There are 2 floors above the basment. Common sense, although not being an engineer, would tell me there is a -ton of weight on this wall. Would a 4-5" depth I beam work? Any other options with wood???