Flat Roof Drainage...

[Mulberry View]

Our scheme has a single Car Port with a 10° monopitch roof which is linked to the house by a walkway with a flat-roof over.

 

This is the roof plan...

 

 

The Car Port is to have a gutter along the low edge, which will drop water onto the Link Walkway roof, which is essentially a flat roof. The water will fall towards the bottom corner as denoted on the plan.

 

From this drawing, I have assumed a kerb is installed at both edges, with the water dropping through a "Plug'ole" before being directed into the adjacent RWP.

 

Does anyone have any words of advice as to how this fall arrangement is organised with firrings? Or can you suggest a better way?

 

I did debate arranging the fall to simply run from right to left and into an integral gutter along the right-hand edge, so in essence the water from the roof above will drop directly into the integral gutter below and the water falling on the flat roof will fall also into the integral gutter.

 

Any thoughts/advice would be appreciated, as always.