When considering revit families, most know how to easily create line based families but have troubles creating them based on an arc. On Enjoy Revit’s blog, he dives into how to make curved insulation and has allowed us to repost his tutorial below.
Step 1.
At my 1st attempt, i just made a simple detail and arrayed it

Of course, I gave some parameters to make it enable to control radius, angle and thickness.

This can be used as it is in projects just as a detail component, but I loaded it to adaptive curved wall in advance. Now this can make curved wall shape that contains insulation in projects.