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TOPWET

YOUR PARTNER IN DRAINAGE SOLUTIONS FOR FLAT ROOFS

Reliable Roof Drainage for All Climates

TOPWET delivers premium roof drainage solutions that prevent rust, ice buildup, and callbacks, ensuring reliable, maintenance-free installations in all climates. Our innovative materials withstand extreme conditions, providing exceptional performance and durability.

From Rust to Resilience: A New Era in Roof Drainage

Plumbing systems have already shifted from metal to PVC and composites, but roof drainage systems have lagged behind. Topwet is changing this by introducing advanced, corrosion-resistant materials designed for lasting reliability in all weather conditions.

Smart Retrofits. Zero Hassle. Maximum Performance.

Our retrofit solutions are easy to install, offering a fast, seamless, and cost-effective upgrade for existing roof drainage without major modifications, minimizing disruption and maximizing long-term performance.

story of our company

Every great company starts with a purpose. Born in the heart of Europe – Czech Republic, Topwet was founded on 2005 with a simple yet powerful belief—drainage is the lifeline of every roof. Without proper drainage, water accumulates, leading to leaks, structural damage, and costly repairs. A roof’s longevity and performance depend on efficient water management, protecting not just the roof itself but the entire building’s integrity..
For Topwet, it a simple yet powerful belief—drains matter. What began in the heart of Europe as a vision to perfect flat roof drainage has growwasn into a global movement. From day one, we committed ourselves to a singular focus: designing and manufacturing the most durable, efficient, and reliable drainage solutions the world has ever seen.
Drains are not just part of what we do—they are everything we do. This relentless dedication has propelled us from our Czech roots to worldwide expansion, earning the trust of roofers and resellers who demand performance without compromise. With state-of-the-art manufacturing hubs and a new Illinois facility ensuring rapid U.S. distribution, we are more than a supplier—we are a partner in every successful roofing project.
At Topwet, we don’t just make drains—we perfect them
LGA certification
ISO 9001:2015 (URS - United registrar of systems)

Blog

TEAM TOPWET

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TOPWET at The International Roofing Expo

Success at IRE 2025 in San Antonio

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Reference projects

AZ TOWER

For the AZ Tower, the tallest building in the Czech Republic, TW roof drains, TWN extensions and TWP and TWOP penetrations were supplied. These systems were chosen for their high durability and compatibility with modern waterproofing materials.

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TWN
TWP
TWOP
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LEGO

Within the project of the LEGO production plant in Kladno, TWPP safety overflows and TWP grommets for cable routing were implemented, supplemented by TWOP ventilation chimneys.

TWPP
TWP
TWOP
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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.

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TWN
TWP
TWPP
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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.

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TWN
TWP
TWPP
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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
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OUR COMPANY LIFE

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TOPWET at BAU Mßnich Trade Fair 2025
TOPWET at the CRCA Chicago 2025 Trade Fair
TOPWET at Czech Trade Fair 2024
TOPWET at BAU Mßnich Trade Fair 2025
TOPWET at the CRCA Chicago 2025 Trade Fair
TOPWET at Czech Trade Fair 2024