How to add "Heel Wall" on top of existing walls and raises the roof?

[rvbinder]

I want to add a "Raised Heel Wall" (see for example https://www.apawood.org/raised-heel-trusses) to the third floor of an existing plan.

 

So, instead of my rafters sitting on top of the third floor joists, this low wall about 16" high extends the existing exterior wall perimeter upwards to support the rafters. The roof design will not change.

The Heel wall will be different HDP wall type than the existing exterior walls to accommodate more insulation.

 

Making changes like this usually breaks a lot of other things in my models, so my question is, what approach will allow me to insert this wall and raise the roof with the least disruption?

 

Thanks in advance.

 

[solver]

Open the Build Roof dialog and review the settings.

 

And for roof questions, it's key to say auto or manual roofs.