Timber Stud Wall Bearing Eccentrically on a Parapet Wall

[otto_eng]

Hi Folks,

In one of my projects, I was asked to reduce the depth of a short(10inch high) concrete wall on which 2x12 stud wall is sitting. The depth of the concrete wall was originally matching with the depth of the studs but now the architect wants to decrease the depth with 2 inches, so instead of a 12 inch deep wall now I have 10 inch wall with 2 inch insulation. The stud wall will be partially sitting on the insulation instead of fully sitting on the wall. I just do not like this detail but also I do not have anything against to it structurally.
Do you folks see any problems with this if yes what are your suggestions ? * The stud wall is very lightly loaded.

Thanks !

 

[WesternJeb]

How is this concrete "wall" supported below? Is this concrete "wall" ground supported?

 

[otto_eng]

The concrete wall is supported by the concrete slab. How would it affect ?

 

[WesternJeb]

It matters because of where the eccentricity goes. If it went down into a larger bearing item then I'd be concerned but that isn't the case.

Is the overhang on interior or exterior? I would be worried about the sill plate being exposed to weather if it is on the exterior side, even if the sill plate is pressure treated. Other than that, I don't foresee any issues. The centroid of the 2x12 studs should still be over the concrete, and the concrete should be fine.

 

[jayrod12]

You can overhang studs up to D/4 or D/3 on most standards as long as the structural checks work for the reduced bearing areas. I assume the 2x12 stud depth is driven by something other than structural requirement, because I've never used 2x12 as studs before.

 

[otto_eng]

Thanks @jayrod12 !