The absence of a interior footing module for the slab-on-grade type foundation is very frustrating for me and I am sure for a lot of other users as well.
With that being said I’ve decided to put my thinking cap on again and give this issue some further thought. Based on what I have so far for foundations and looking at some other foundation examples I think the following parameters should be sufficient to fully define an interior (thickened slab footing):
Slope Start: Yes/No
Slope End: Yes/No
Vertical Drop: default is zero
Anchor Bolts: Yes/No
Ftg. Bar Dia:
Ftg. Bar Qty: 1,2,3,4,6
Anchor Bolt Options:
Anchor Bolt Length: 10,12,14 (in.)
Anchor Bolt Dia.: 1/2 or 5/8"
Washer 2X2, 3X3
Bolt O/C Spacing
Sill Plate Thickness:
The vertical drop option is the 6" dimension in the image below:
The interior footing module will be quite similar to the window and door module in the Wall plugin. It will allow the user to add, delete, move or edit any interior footing within the SOG. Unlike the current system (only one interior footing possible), the user will be able to create as many footing as they like, criss-crossing the slab in any direction at any angle. Once this feature is in place the slab-on-grade foundation will be much more versatile and hopefully much more capable of modeling real life (complex) foundations.
Please let me know if there are any other parameters or options that I might be missing from this list.