Blocked downpipes on flat commercial roofs
Why it happens here
Flat roofs do not shed debris the way pitched roofs do, so leaf litter and grit settle around outlets. When a downpipe blocks, water ponds on the roof and can find its way into tenancies below.
Our approach
We clear the outlet, jet the downpipe and check the full drainage path with an inspection camera. We also map the roof layout so we can clear every outlet, not just the obvious one.