Stewart-design

I am using Home Designer Pro 2018. The attached file and elevation drawing should communicate what I am trying to accomplish. The arched CAD polyline on the elevation drawing is about the arch size I need for the wall it is against. Thank you for your help. 1545 Napoli way arched wall.pdf 1545 Napoli way.plan

What is a good way to create an arch on top of a wall? I am trying to show a wall or railing in perspective and 3D that is arched on top and can be modified as needed. Any suggestions? Thank you,