Along with the benefits of a flat roof come unique challenges.
Portico roof drainage.
These ditches guide water toward the eavestroughs.
I did find this post that shows installation of a portico on an already sided house that shows how they cut away the siding for the roof structure.
Adding a roof can create drainage problems if the roof pitch is too shallow.
Of course the best designed flat roof has the correct amount of pitch to drain the water off naturally.
The most critical of these issues is the flat roof drainage systems.
Here is a diy under deck roof and drainage system part 1 i m here with my parents to show you how to install a diy under deck roof and drainage system part 1.
Your building and location can help determine which drain will fit your roof needs.
Flat roof drainage system specifications designs troubleshooting problems solutions for interior drains on flat building roofs flat roof drains scuppers and screens questions answers about keeping the flat roof drainage system working or about installing new drains in a flat roof.
Drainage ditches are created in the roof in the lower insulated areas.