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# Thread: Inner loops of a footprint sketch may not have slope-defining lines.

1. ## Inner loops of a footprint sketch may not have slope-defining lines.

Hello,

I'm trying to create a simple square roof for a building with an interior courtyard, and I am getting this error message: "Inner loops of a footprint sketch may not have slope-defining lines."

After this I tried to do this by cutting a slice from the roof (see picture below), but this has created a roof where the valley isn't in the right place. FYI The roof sections are even. What can I do to fix this?

Thank you

Edit:

negative values as suggested by @elton williams worked perfectly. Please see below:

2. Build it as multiple roofs and join them together.

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3. You can also use negative values on the outer boundaries.

4. Cheers GMc, I have used Elton's suggestion and will keep multiple roofs in mind if I get errors.

5. Have you tried "Align Eaves"? Are you sure the offset from walls are all equal?

6. You can also use Modify Sub elements and Edit Points to assign a value to each point.

7. Originally Posted by cliff collins
You can also use Modify Sub elements and Edit Points to assign a value to each point.
Be careful with that since it changes the thickness of the Roof/Floor when measured perpendicular to the surface -- which, IMO, is a mistake on Autodesk's part.

8. Originally Posted by asintoras
Have you tried "Align Eaves"? Are you sure the offset from walls are all equal?
Didn't know about 'align eaves'. Thank you (eaves were aligned)

9. Originally Posted by GMcDowellJr
Be careful with that since it changes the thickness of the Roof/Floor when measured perpendicular to the surface -- which, IMO, is a mistake on Autodesk's part.
Good to know - I've had some crazy glitches doing this with floors

10. Originally Posted by cliff collins
You can also use Modify Sub elements and Edit Points to assign a value to each point.
Can I do this with roofs like with floors? Where is the option? Thank you