Hello, I was able to figure out to convert one slab and partition into garage and then had the garage lower than the attached home. Although, I don't know what the grey lines are that was created on each side (top and bottom). I am doing a garage conversion and need to add 6 inch joist in the garage. I figure 16 inch on center between joist. How do I get it to build automatically on the garage slab.
thanks,
Ben