Flat roof problem

[Anonymous]

I am creating a plan of an existing flat roof.  The building is rectangular but has a large notch on one long side so the plan is kind of u-shaped.  The slope is to the center with a single valley.  When I put a split line down the middle it creates plans and valleys to the sides of the notch.  How can I eliminate these planes? The entire north half slopes to the center.  When I set the sides to "define slope" I get "slab edit failed" message. 

Note, the south hatched section is a mansard style clay tile roof.  There are parapets at the corners that wrap into the roof.  How to I notch the sloped roof?

[LisaDrago]

Hello - is the attached image what you are looking for?

LD

[Anonymous]

No.  I did achieve the look I need by changing several lines "invisible".  See attached plan and difference to my original. 

This will be acceptable for my roof repair project but the extra planes are still there and if/when I need to create building sections or details the roof is incorrectly created and will cause problems.

[Michaelsmith224]

Flat roofs often face issues such as pooling water, leaks, and degradation of materials due to exposure to the elements. Regular maintenance and proper drainage systems can help mitigate these problems.