How to add a new exterior door to a room

door-frame

I have a room where I would like to add a door to the outside.

The house siding is cedar shingles and the room is not insulated (which I am going to add).

I believe it should be relatively simple to do (I'm not looking for anything fancy but do want the door to seal properly).

I think all I have to do is cut out the rectangular region for the door, properly sized, then frame up the entryway using 2×4's and secure it properly to the rest of the framing.

The main issue I am concerned about is with the shingles as it will be difficult to fix if a mistake is made.

Any tips or concerns I need to keep in mind?

Best Answer

There are lots of concerns I can think of (this is a much bigger project than simply cutting a rectangle in the wall):

  • Exterior walls are load bearing, so you need to construct a header, king, and jack studs, to properly transfer the load over the door. During construction of this, it's a good idea to install temporary bracing.

  • Any utility lines in the wall will need to be moved (electrical, plumbing, hvac, etc).

  • The door needs to be installed so the exterior house wrap properly overlaps it so any water that gets behind the singles doesn't come into the door.

  • You need a threshold and possibly some flashing to keep any water or drafts from getting under the door.

  • You need to properly trim around the door, particularly outside, to keep it weather tight.

  • It's critical that the door is level and plumb so it doesn't open or close accidentally.