Share Email Facebook Twitter LinkedIn Troubleshooting: Roofs Learn how to correct issues with roofs, sloped glazing, and related elements. Topics in this section Extruded Roof Must Face Upward You may encounter this warning when creating an extruded roof that contains vertical sketch lines. Parent topic: Troubleshooting: Model the Design Related Concepts Modify a RoofRoof Instance PropertiesRoof Type PropertiesEnergy Analysis Model Does Not Contain Any Roof Surfaces Related Tasks Create a Roof by FootprintCreate a Roof by Extrusion