Question from an Owner/Builder:
My exterior wall framing is 2×6 (24″ OC). I was planning to use 2×10 for the window & door headers. What would be the normal way to construct these? 2 with spacers in between the 2×10’s or 3 with plywood sandwiched between each 2×10?
Thanks
Get expert guidance on finding a fixer-upper that's worth the effort.
"I have learned so much thanks to the searchable articles on the FHB website. I can confidently say that I expect to be a life-long subscriber." - M.K.
Dig into cutting-edge approaches and decades of proven solutions with total access to our experts and tradespeople.
Start Free Trial NowGet instant access to the latest developments in green building, research, and reports from the field.
Start Free Trial Now
Replies
Three is stronger than two. If the load allows I would use a box beam. The box beam style header is not quite as strong as a face nailed header with equal amount of 2X member because it forgos friction which compounds the strength of members when they are face nailed to each other. So if you feel you have a big load use three. When assembling I want to make sure that the header is not going to intrude on the drywall plane so I use 3/8 ply or forgo a layer of 1/2.
Johnny,
Around here we just use 2-2x10's nailed together with no spacers. It also depends on how wide the openings are. Even on 2x4 walls just 2-2x10's. The plans should also tell you what you need for your area.
The size of the header depends on the length and the load it's carrying. I've always used 3 with 1/2" plywood in between for your average window. I think it's overkill, in most cases, but I'm stuck in my ways and it's good to be consistent when you also have some wide patio doors or a picture window. Speaking of doors, if you are using the same size header over them, double check your stud height to make sure the door will fit in the rough opening.
If you are building in a climate with cold winters, you should be concerned about insulation. Both TrusJoist and Superior make insulated headers in a width for 2x6 walls.
TrusJoist distributes nationally, and Superior only regionally.
TrusJoist's is in various depths, although most wholesalers are stocking only the deeper sizes, equivalent to 2x10 and 2x12 depth. From my recollection, Superior only has a size to meet the 2x12 depth.
They are pricey, but the cost increase over making them up with sawn lumber probably is offset by the labor savings. If it is to be all your own labor, though, you'll have to make up your own mind.
Gene Davis, Davis Housewrights, Inc., Lake Placid, NY
I use 2x12 for most headers. I nail them tight together and hold flush with exterior. Then I rip a 2x4 to 2 1/2 and add it to bottom of header flush to inside. Then insulate the void created.