The people who built the portico that is serving as my main inspiration for my portico describe briefly that they cut away the siding to fit the portico but they didn t really go into detail.
Portico roof drainage.
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.
Your building and location can help determine which drain will fit your roof needs.
Along with the benefits of a flat roof come unique challenges.
Drainage ditches are created in the roof in the lower insulated areas.
The most critical of these issues is the flat roof drainage systems.
Drainage helpers drainage helpers are a good option if you already have a good flat roof drain system but want to provide your system with the ability to move more water if need be.
Minimum roof pitch the minimum pitch for a roof is 1 4 12 which translates to 1 4 inch rise to 12 inches of run.
These ditches guide water toward the eavestroughs.
Of course the best designed flat roof has the correct amount of pitch to drain the water off naturally.