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Window and Door Header question

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33K views 79 replies 27 participants last post by  Cjeff  
#1 ·
hey guys,i notice most window and door headrs are usually 2 -2x 10's or 2 x 12's.. howevr, i notice there is always a gap between them with some wood separating them on each side. why are they just not nailed flush together,why put plywood in between? also,why only partially fll the gap,why not one continuous piece in the middle?
also,i see plywood on the bottom of the 2 x 10's .. why is that?
thanks guys
 
#44 ·
On some water front homes we have used a 3 ½” x 11 7/8” power lamb on top of the pl8 across the entire wall. Then cripple in 2x8 header bellow. This is more for wind load and the end to end header displaces the weight across the entire structure. This method kills the HVAC & plumbers who need to run mechanicals, but in the long run it’s better to run mech. inside on water front homes
 
#60 ·
For me it is mostly 2x6 on new work, 2x4 on garages and renovations.

I nail the 2-2x10 together, with a 2x6 (or 2x4) flat on the bottom. The bottom is 3 inches shorter, 1.5 on each side. So the trimmers (or jacks) go right under the 2x10 header, and the 2x6 (or 2x4) goes in-between the jacks. The gap goes to the inside.

Why? Because it is how I was taught and faster for me then other methods.

Another guy I worked for separated his 2x10's insulated with fiberglass between them, then put on the bottom 2x6.
 
#69 ·
For doors I usually nail the 2x10 tight together and put the jacks right under it, and when the bottom plate gets cut out for the door, I nail that cut out up under the header. Gap to the inside for insulation.

As I said, spacing the header plys with plywood will get your inspection failed around here.

Also, headers right above the opening, not under the top plate.
 
#65 ·
A small opening doesn't require such a header, but for continuity of height, it generally is the case. I've had situations with limited room for header on 2' width that were designed with the top plate removed, leaving only the double plate above a 2x4 header. I've also had situations where their was no header in the wall, just the two plates and the box was doubled in the floor system above with the joists hung from that.
 
#67 ·
It depends on the wall thickness. However, the bottom plate almost always gets cut out during a door installation. I have done stepover door sills onto waterproof decks with parapet walls, although I prefer to step down onto the deck without raising the floor height with sleepers. It depends on the design of the building.
 
#77 ·
Not to add fuel to the fire but since I started back in 1990 I have never framed a house with 2 x 4 always 2 x 6.

The builder I worked for always used a three ply header, pluse plywood fillers. It was typical for us to use the form material from the footings for the headers.

This was usually 2 x8 or 2 x 10 material, I as the low man had to pull all the nails scrape the concrete from the forms and stack everything ready for cutting.

We would install headers at the prescribed height just above the window or door heights.

Over the years on my own and after one too many customer that wanted to change the window height I decided to install all of my headers under the plate and build down to the proper height. I also lost the plywood and would fill with rigid foam to the interior. I found that the sandwich always stood proud of the studs.

I subbed the framing on my last major project and the framers used a spaced header just above the windows. I had my spray foam guy fill the cavity with foam.
Hope this helps Chad
 
#78 ·
Our codes allow us to put the header on the jacks or all the way up with crips under. I prefer it at the proper height with crips above. Like Rizz said it just feels stiffer for the door. Picture a long garage door header all the way up with long crips and a 16" long plate under that. Seems more stable with the header right there where the door is. Many times on the interior walls I will put the header all the way up to allow for people to decide later if its a 6'8 door, 7'0 door, or maybe even an arch. Much easier to adjust if the header is up. When in doubt, Push it up!