Pumping a flat roof dry: the ideal combination for roofers (flat suction hose, elbow, and non-return valve)
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If water collects on a flat roof, a flat-suction submersible pump quickly and thoroughly drains it. For roofers, the ideal combination is the orange SOS PUMP, which pumps the floor almost mop-dry (down to a few millimetres), a knee coupling to prevent kinks in the hose, and a non-return valve to prevent backflow. This makes drying a roof super easy.
Why use a flat-suction pump on a flat roof?
You're just getting into your stride, and then it starts pouring. The whole roof is covered in a large layer of water, there goes your day. Standing water on a roof is incredibly annoying when work needs to be done, and it can really throw a spanner in the works. As a roofer, you might have to rearrange your schedule, or your client might have to wait months.
The SOS PUMP is a flat-suction submersible pump that leaves the roof almost mop-dry, so you (almost) don't need to mop afterwards (depending on the work, of course). If you want the pump to switch on automatically when it rains, choose the SOS PUMP with automatic level control — it switches itself on and off as soon as there is water on the roof.
The knee coupling: no kinks in the hose!
On a roof, the hose is almost always at the same height as the pump. This often causes the hose to kink at the pump, and a kinked hose means pressure loss or no flow at all. The SOS PUMP knee coupling creates a neat 90-degree bend directly behind the pump or at the roof edge, so that the hose runs straight and continues to drain at full power.
The non-return valve: no backflow, less switching
As soon as the pump stops, you don't want the water in the hose to flow back onto the roof or cause the pump to restart unnecessarily. The SOS PUMP non-return valve keeps the water in the pipe, prevents the system from starting unnecessarily, and ensures more efficient drainage — especially with a long hose to the gutter or drain.
The complete combination for roofers
| Part | Function |
|---|---|
| SOS PUMP | Flat-suction pump, leaves the roof almost mop-dry |
| SOS PUMP knee coupling 25 mm | 90-degree bend, prevents kinks at the roof edge |
| SOS PUMP non-return valve 25 mm | Prevents backflow and unnecessary restarts |
| SOS PUMP water hose 12.5 m | Flat, rollable discharge hose |
All parts connect to the universal 25 mm (1 inch) size. Do you want everything complete in one box? Check out the SOS PUMP PLUS 'FLOOD-BOX' or the full SOS PUMP assortment.
Practical tips
- Place the pump at the lowest point of the roof, where the water collects.
- Lay the hose with a slope towards the drain, so it empties afterwards.
- Choose the SOS PUMP with automatic level control, so you don't have to worry about it during work.
Frequently asked questions
Which pump do I use to drain a flat roof?
The flat-suction SOS PUMP: it pumps the roof almost mop-dry. With automatic level control, it switches on automatically when it rains.
Why a knee coupling on the roof?
It creates a neat 90-degree bend at the pump so the hose doesn't kink and the pump continues to drain at full power.
What does the non-return valve do?
It keeps water in the hose, prevents backflow onto the roof, and unnecessary pump restarts.