You can access a free copy of the 2012 international building code here.
How to frame a header for a sliding glass door.
You will need to add 1 2 of plywood between the 2x4 s to get the right wall thickness of 3 1 2.
When installing a sliding door the frame is going to require the most attention.
In all but the most bizarre situations they ll easily carry the weight for 4 ft.
To make the door header the top of the door frame cut two 2x4s to the same length as the width of the original opening and nail them securely together.
A 36 door has a rough opening width of 38 so your header is cut at 41.
When in doubt build a double 2 12 header sandwich like we explain next.
The steps to frame a sliding door and the tools required for the job are listed below.
Between 4 and 5 feet the header should be built 2 inches wide and 8 inches long while a larger opening needs a header that is 2 by 12.
Non load bearing windows and doors do not require a structural header.
Be sure to check code requirements prior to framing.
Wide a common patio door width.
This is the actual thickness of a 2x4.
Cut the door header.
If the door is not framed correctly the door will not stay in place.
Most door frames that are 4 feet wide or less require a 2 by 6 header.
Also be aware double or triple jack studs may be required based on the opening width and the load the header carries.
Section r502 5 shares allowable girder and header spans.
When in doubt use 2 by 12 inch headers.