I am adding a 20 foot extion on the gable side with no 2nd story. I am putting in 15 feet of gliding doors on the gable side with a 3.5" x 9.5" by 10' power lam header/beam. Is this an overkill and if so, what is your recommendation. PS no supports or heavy duty mullions imbetween the 4 glass glidding door sections.

Thanks, Myron