Standing water on a flat roof — Delft, South Holland
If water is still pooling on your flat roof 48 hours after the last rain, you have a ponding problem. Flat roofs are designed with a slight slope to drain, but sagging decking, clogged internal drains, or shifted insulation can create low spots where water sits. Prolonged ponding accelerates membrane deterioration, adds hundreds of pounds of dead load to the structure, and eventually causes leaks. A roofer can identify the cause — whether it's a drainage issue, structural deflection, or membrane failure — and restore proper drainage with tapered insulation, additional drains, or membrane repair.
Why this is common in Delft
Roofs in Delft range from steep tiled pitches on older buildings to flat membrane roofs; both take a beating from autumn/winter North Sea storm fronts, driving leak and storm-damage callouts.
Who to call
For this problem in Delft, call a: Roofer
Find a Roofer in DelftUntil the pro arrives: Fix it yourself → Don't do this yourself
Symptoms to look for
- Visible puddles or standing water on the roof two or more days after rainfall
- Dark stains or algae growth in specific areas of the roof membrane
- Sagging or soft spots when walking on the roof surface
- Water stains or drips appearing on the ceiling below the flat roof section
- Clogged or slow-draining roof drains, scuppers, or internal downspouts
Emergency Service in Delft
Emergency services in Delft respond within 25–55 minutes. Emergency rates run €70–€170 for callout plus €65–€130/hour incl. BTW.