Emily when deciding what size header to install above your new french doors you must first consider the size of the load being supported by the header and wall framing.

Window and door header size chart.
Most builders automatically choose double 2 x 8 or 2 x 10 headers to frame windows and doors in every house they build.
If headers werent used on load bearing walls for openings this could cause a potentially dangerous hazaard.
Into the header that equals or exceeds the intended application.
The header is usually made out of dimensional lumber installed on its edge.
The chart below shows common header sizes for.
Find the clear opening that equals or exceeds the intended application.
Calculating the size of the header depends on what the header needs to support.
Doors in a load bearing wall that holds the weight of the house created by beams and trusses need a larger header than those in non load bearing walls.
Undersized headers will bow downward pinching windows and doors and making them difficult to operate.
Tables providing size selections for various beam spans and loading combinations for southern pine dimension lumber and southern pine glued laminated timber are available for the following applications.
Before you do the work of putting in a header consult an engineer or the construction code department at your local city hall so that you do not violate state or local building codes.
Window door garage door headers supporting roof loads only.
For example if you are installing the doors in an exterior bearing wall that is directly supporting the weight of the roof and possibly a second floor then double 2 x 10s.
Without headers of the proper size your walls could fall in.
If you choose a header that is too small its weakness could lead to a collapse.
The width or span of the opening will determine the size of the header needed.
Window door garage door headers supporting roof loads only.
The same is true for beams like.
A neat solution but is this an efficient and cost effective use of material.
These headers work to support most residential loads and coincidentally keep the window tops to a uniform height.
Notes for tables 1 6.
There is no simple rule of thumb to determine exactly what size a header should be.
It is not easy to figure the exact size of header you will need for reconstruction in your house.
The international building code ibc dictates the sizes of headers to ensure that they.
Not only would the structure be unsafe doors and windows over a period of time would not function properly.
Select product size for the appropriate grade clear opening and span of supported roof framing.
Window headers support the roof and other structure above a window.
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