I thought I was done with flat trusses but it was pointed out to me that I also need to consider top chord bearing configurations for this truss type.
I've created a simple matrix below with top and bottom chord bearing flat trusses. I'm not sure if these make sense, please review and feel free to comment.
The model can be downloaded here:
Top chord bearing usually involves the following steps:
1.) Trimming the heel web up a specific vertical amount (vertical offset).
2.) Insertion of a secondary heel web next to the trimmed (bearing) heel web.
3.) Trimming the bottom chord back to the secondary heel web.
4.) The diagonal web next to the heel is slightly altered by the addition of a secondary heel web.
5.) Certain configs require an additional heel web on the outside of the trimmed heel web: Mansard, Cantilever, Mansard w/ Parapet.
I can easily make this all happen and open up the option for top chord bearing flat roof trusses however I want to make sure it is right first.