Can I use a Double 2x10 Header to Enlarge this Window to Patio Door?

I am installing a 6ft wide patio door in place of an existing window. I have uncovered an existing Double 2x10 header with a Double 2x4 top plates on top of this header. Normally, I think this would require a Double 2x12. But, can I use the existing Double top plates with a new Double 2x10 to span the new 6ft wide patio door opening ?

Photo is here: http://twitpic.com/7f85oz

2011-11-16T21:32:37Z

Existing window rough opening is 4 ft wide. The top plates are on top of the existing 2x10s and I do not have enough height to install 2x12's unless I remove the top plates.

2011-11-16T21:35:11Z

Exterior load bearing wall with one floor above. Bears on foundation concrete.

2011-11-16T21:37:30Z

50 ft wide exterior wall

Wilson2011-11-16T21:50:07Z

Favorite Answer

With another story on it I would not fudge with 2x10s but you could maybe use a couple 1-3/4" thick LVLs. I would not cut but maybe one of the top plates to get 10-3/4" height.

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