Drainage Systems for Flat Roofs

Your Partner in Reliable Roofing Solutions

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TOPWET is the ultimate drainage system for flat roofing - built to last, engineered to perform, and trusted worldwide.
Our all-climate, self-heated, and retrofit-ready solutions eliminate rust, ice buildup, and costly callbacks, ensuring seamless installs and long-term reliability. Resellers sell more, roofers install faster, and homeowners get superior protection—no rust, no ice, no callbacks.

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Upgrade Your Roof, Not Budget.
Faster Installation,
Lower Costs,
No Disruptions!

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why topwet

topwet system

traditional metal drains

ALL-CLIMATE MATERIALS

Unlike metal drains, Topwet does not rust or corrode, ensuring long-term performance even in harsh weather conditions.

EASY TO INSTALL

Whatever roofing membrane you use, that’s the sleeve.

SELF-HEATED DRAINS

No ice dams, no winter blockages—our smart, energy-efficient heating system prevents freezing and guarantees uninterrupted drainage, protecting your roof and structure year-round.

RETROFIT SOLUTIONS

Upgrading an existing roof? Topwet retrofit drains install fast  and seamlessly integrate with old and new roofing  systems—no costly overhauls, just superior drainage.

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Reference projects

MERCEDES-BENZ

The Mercedes-Benz showroom uses a roof drainage system comprising TW roof drains, TWN extensions and TW and TWOP grommets. These elements were installed for efficient stormwater management and roof protection. The

TWN

TWP

TWOP

BOSCH

The Bosch complex was equipped with TW roof drains, TWN extensions and TWPP safety overflows.
The solution also included TWP cable penetrations and TWOP vent stacks, ensuring efficient drainage and meeting the stringent requirements for roof structure protection.

TWN

TWPP

TWP

VOLKSWAGEN

The extensive production area of the Volkswagen car factory was equipped with TWPP, TWP and TWOP drainage elements, which were designed with an emphasis on long-term durability and easy maintenance.

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TWPP

TWP