Putting in two small windows as part of our kitchen remodel (21" x 31").
They are going in an exterior gable wall, framed with 2×6's.
I can't get a straight answer from anyone about what "size" header I should put in! Do I have to use 2×10? Or would 2×6 be fine?
Also, any input on how to construct the headers themselves? Should I build hollow and insulate, or actually build solid ones with three 2x's and some sheets of 1/2" plywood to equal 5 1/2"?
Last related question: should I install a double sill plate in this scenario or is a single sill plate sufficient?
I have include two diagrams below. The first shows how I plan to frame out the main openings (implementing a double sill plate). The second diagram shows how I plan to rough in the actual window openings which are represented by the grey areas.
This is how it ended up. Hope it speaks for itself and thanks to everyone for their input.
Best Answer
It's hard to provide a "straight answer" with the information given. Bearing wall vs. gable wall, rambler vs. two-story. Window position and wall height. There are many factors. I can tell you that triple-member headers are not common except where limited height is available.
We built nearly all our exterior headers with doubled 2x10s in a U configuration, with insulation between. This leaves no voids when drywalling, hanging window treatments, mounting exterior trim, etc., and we know they're adequate from a structural standpoint. It's only when dealing with spans over 5 feet or so that you start looking to LVL headers.
When in doubt, and when there are no drawbacks other than a little initial cost increase, go with the bigger option.