I started to close all doors so I could get the floor back and after about 90% completion of putting lines to close off the exterior doors; it crashed again.
I wonder if I need to reinstall it again?
I’m glad that worked better.
The first tip is to follow Box’s suggestion to turn off Length Snapping in Window>Model Info>Units and to increase Precision. You may only care about the nearest foot but setting the precision to 1/64th in. will let you see when things are out. With coarse precision you can induce all sorts of errors that you can’t see. If you later need to dimension the model you can set the precision to what you want to show.
As I wrote last night, I would create the floor slab and group it. Then model the walls with no floor faces so you can see the image below.
I doubt it. Do what I suggested. Group the walls without the floor faces. Then create a slab for the floor as a separate group.
Get the floor slab done, group the geometry, and give that group a tag so you can show it or not as needed.
Look at how I’ve done this.
Elementary School New.skp (1.8 MB)