Aligning basement and first floor stairs leaves a gap

[armfx89]

Hello

 

Please see pics. Basement wall type is 8" concrete + 4" interior...while first floor exterior wall is 8" siding. The thicker basement wall causes a gap to be left on the first floor when aligning the stairs on both levels. Any suggestion what is actually done in this case to fill that gap.

[robdyck]

A simple way to clean that up visually (3d) is to draw an invisible wall aligned with the basement frost wall. Then you'll have a small room over that area which will provide a floor structure and finish. You could create a default room type specifically for this purpose if you wanted a shallower structure depth, with different finish materials and moldings.

[joey_martin]

Are you saying you are surprised by that condition? That sounds rude, and it's not meant to be, but placing basement stairs against an exterior will always result in needing to find a way to cover, insulate, and seal that rim area. I like to fur out the wall above so that it aligns, a window seat can be added, or a plant shelf.

 

Add a note to your internal Q.C. and design documents that if a basement stair well is on an exterior wall, this will need to be dealt with and have the conversation with the homeowner during the initial design phase.

[Michael_Gia]

8 + 4 > 8

 

That’s why there is a gap. 

[Doug_N]

This unintended stair shelf is common in lots of houses.  Sometimes this is addressed by adding a false wall on the shelf in the stairwell to make the wall look continuous, but that results in a void behind the wall.  This could be filled with extra insulation or used to hide ducts or piping.  If you do renovations, you're bound to find these "shelves" in lots of northern homes (houses with basements.)

[armfx89]

Thanks everyone for the replies.

 

Here it is common to find houses with basement and a side entry for the tenant. Hence why the stairs is placed against the exterior wall.