I am currently building my own home with a flat roof. This needs to be greened, which I would like to do myself. Most things are clear to me, but there is one place where I am still lacking guidance: how do I deal with our exterior drainage (i.e. the place where a pipe goes through the attic)? I probably shouldn't dump gravel in front of it .... but then do I just leave a gap in the gravel or should I make a partition of L-sections?
How to arrange a drain on a flat roof with greenery?
Hi, L-profile is overkill. Just planting something in front of it is bad because the roots will eventually constrict or even close the pipe. I would put large river pebbles in the area. You can find them in the hardware store. And the whole thing is then (eg in the spring) revisable and you can clean.
The planting usually does not go up to the parapet anyway, but is e.g. delimited with gravel strips. Influences of course keep free, the roofer delivers anyway.