I'm going to be installing a patio door between 10-12ft wide, which will knock out quite a few studs. The wall supports a second story above. Since this is in a basement with a low ceiling, I'd like to have the narrowest header that would be sufficient to support that size of a door opening. Ideally, it would be no more than 6", and preferably closer to 4". I'd be willing to use steel I-Beams if it were possible to, but if I have to use wood for the header, what would be recommended? Also, if steel I Beam recommended for header, how can I attach the I Beam header to the supporting studs? Any suggestions much appreciated.