The fall is set on each plane. Valleys into the outlets run on the diagonal, so they are flatter than the planes. Minimum thickness is the screed at the outlet. Cement screed or brick-bat coba is roughly 19–22 kN/m³; use your own value. Outlets per edge is ignored for the 4-corner layout.
Thickest point–
Valley fall–
Screed volume–
Dead load avg–
Plan of falls
Section along the outlet edge
Per outlet catchment m²
Outlet options
| Layout | Outlets | Thickest | Average | Volume | Load avg |
|---|