Grouping pdf floor plan as an image file

[endlessfix]

What we are seeing in the image you posted is Z-fighting, the floor of your model is occupying the same location in space as your imported PDF. SketchUp cannot decide which one to show you so it shows both. You will need to hide the floor of your building for the PDF to occupy that space without shimmering. Best to assign your tracing map it’s own tag for easy visibility control. What @pbacot wrote about keeping your imported PDF as an image rather than texture will make it not disappear when editing other groups/components. Here are more tricks for this work.

Tracing a floor plan

I can think of some tricks for this. But I wonder why you are tracing over lines you already have modeled, can you explain your use a bit so that the answer will suit you? Why not use the lines you have or just delete the ones you don’t want to leave the ones you need? EDIT: Apologies, I just noticed that you wrote imported jpeg. I was confused by you saying you had exploded the import which led me to believe that you were dealing with raw geometry. You should not necessarily need to explo…