Wall base extension offset and foundation by wall issue

[jake_hagan3ULFD]

Hi there,

I have unlocked the finishing layer of my wall to allow me to control its height in section. This creates an issue with my foundation by wall as it associates a foundation to the base of the offset (see image).

I only need the foundation at the base of the wall and do not need one to be associated to the extension offset. The issue is I cant see the option anywhere to remove this association...

Ideally I want to keep the ability to control these wall layers so that my detail views match my 3D model, saves me having to do lots of cut profile which all ultimately lose their host if the wall moves at all,

Does anyone have any smart ideas / workarounds for this?

 

[jay_colcombe]

The simplest way is to draw a Foundation Wall rather than using a Wall Foundation, they work downwards so will be associated the the same level as the bottom of the wall and may give more flexibility.

But you can also enter a Value for the Base Extension Distance in the Properties Palette

[jake_hagan3ULFD]

Thanks for the response. If possible I'd like to avoid drawing the foundations manually because the by wall functionality is very convenient for adjusting wall locations and build-ups. I don't want to have to end up adding loads of constraints to the model for the foundations ideally.

[jay_colcombe]

I use this method for more flexibility but appreciate your approach too!

Therefore as previously stated simply the Properties Palette and Edit the Value for the Wall Layer offset rather than dragging arrows 

[jake_hagan3ULFD]

Changing the parameter value in the properties is just a method for inputting a integer value against that parameter value. Using the slider is basically just a visual method of inputting the same thing...

Both methods cause the same foundation by wall behaviour.

[jake_hagan3ULFD · Accepted solution]

Ah turns out the behaviour is driven by the wall join condition. Changing the wall corners to join as 'square off' has fixed the double foundation issue.

[jay_colcombe]

Fix one issue but creating another as that wall join does not look right so now needs manually work to fix!

[jay_colcombe]

Not in my model, maybe play with the wall build up to see the problematic layer

[GaryOrrMBI]

Coming from a firm that has Architects and Structural Engineers both in house and working in the same workshared model, we have found that better control is obtained by creating the exterior walls from the lowest level up and the foundation walls from the lowest level down to the top of foundation level.
Yes, this requires constraints between the lower foundation wall and the upper Exterior wall (or manually keeping them coordinated) but it solves so many issues like the one that you are facing.
The wall foundations are attached to the foundation walls, yet the exterior finishes can be raised and lowered (relative to the wall base) as required without impacting the foundations, but also allows the foundations to be split and raised/lowered as required when step footings are needed to follow grade, all without impacting the associations happening above grade (even more important when using stacked wall types).

It's just cleaner and much more reliable for us.

-G