Flat Roof

I have as simple a roof as I can have.

A flat roof.

Which technically means.

  1. it is rectilinear but that does not mean a rectagle
  2. It sloes to what starts as one ridge 2' from one side
  3. It slopes to a dozen roof drains

The way it is made is typical. 

  1. The bar joist rest on the North wall at 12'-8"
  2. The south wall zig-zags up and down by 4".  Every 20'
  3. Then a 2' fill is poured from the south wall to the drains
  4. This is a true flat roof.
  5. Both top and bottom modify.
  6. Push pull will do the top but leaves the bottom flat
  7. Any Suggestions