If you are cutting a larger opening as for a patio door install temporary supports and use larger lumber.
Add a door to an exterior wall.
If you add the width of a 12 inch header and the door trim you re only a few.
Exterior walls are load bearing so you need to construct a header king and jack studs to properly transfer the load over the door.
There are lots of concerns i can think of this is a much bigger project than simply cutting a rectangle in the wall.
Mark the door rough opening on the exterior wall.
2 build the frame.
A 2x6 header is strong enough for a 3 foot wide door opening.
O drill a hole from the interior through the mortar joint to create a controlled dimension pull spot o determine the height of the door by using the rough opening of the door.
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The installation procedure for this door is basically the same as most other pre hung doors.
The door frame will consist of two king studs which run the entire height of the wall frame.
You add 3 inches to account for the thickness of the jack studs in the door frame.
You might choose to use an existing wall stud as a king stud in which case you can cut the opening 1 1 2 inches inside that stud and slip a jack stud into the wall.
Jack studs are the studs that are located between the sides of the door and the wall frame.
It s a therm tru door which is well insulated for weather protection and comes pre primed with pre cut holes for the door knobs.
And a horizontal header across the top of the door that preserves the structural integrity.
Add height for interior throw rugs and exterior trim.