Doors and Windows - Sliding door install ?????

I have two seperate sliding glass doors(for insulation) and am replacing them with a single lowE dual pane insulating sliding glass door.My question is,does it make any difference if it is mounted flush with the inside wall or with the outside wall(I can then install the drapes inside the opening instead of on the inside wall). There is a 4in.difference between the inside and outside floor,concrete.
Thanks, in advance for the help.:thinker:

Are your new doors wooden frame or metal? If metal, it will transfer as much cold air in the winter as a single pane of glass, so the lowE dual pane will only marginally help. Unless you are set on sliders, have you considered a french type door? Much more energy efficient.
To answer your question, the door casing should be flush with both the inside wall and the outside sheathing. If you have 2x6 framing and the casing on the door is 4 9/16", then you should install it flush to the sheathing on the outside and install jamb extensions on the inside, allowing for proper dress out and allowing a place for your drapes to be hung in the opening rather than outside.

A lot of the houses in SE Arizona are block, or block w/ brick veneer. The level that your current door is installed will likely be the same level you want your new door installed. This will likely be because of the way your door sits on the threshold- how the floor covering meets up with the door, and where any slope or step on the outside of the door begins. So no, I don't think you would move it out and install curtains inside the opening.

Are your new doors wooden frame or metal? If metal, it will transfer as much cold air in the winter as a single pane of glass, so the lowE dual pane will only marginally help. Unless you are set on sliders, have you considered a french type door? Much more energy efficient.
To answer your question, the door casing should be flush with both the inside wall and the outside sheathing. If you have 2x6 framing and the casing on the door is 4 9/16", then you should install it flush to the sheathing on the outside and install jamb extensions on the inside, allowing for proper dress out and allowing a place for your drapes to be hung in the opening rather than outside.
The door frames are ,I think vinyl or fiberglass. The house walls are 8in.slump block with 1 1/2 in furring strips for insulation. So the wall total thickness is 9 1/2in thick.
Sorry, I forgot all walls are not the same.I should have given more details.
Thanks for the reply