Craftsmanship at the highest level

You’re on the job every day for your customers, carry out your work in any weather and work together with suppliers, subcontractors and subsequent trades. We help you to round off your service to the customer in a rewarding way and protect the service you provide - nationwide and with short response times.


Dichtigkeitsprüfung | NIS Flachdach-Prüfungen | RAL und ISO zertifiziert  | vertragsneutral und unabhängig

Leak test: for making sure you have a safe status quo.

Protect your performance with the independent and RAL certified HV-SLD leak test. 
With our inspection report, you receive reliable proof of the quality of your work before handover. Be on the safe side before subsequent trades enter the roof area and carry out installations there. 

For large construction projects, the status quo of the completed partial areas can be documented by inspecting individual construction phases. The inspection certificate can be used for billing the client and your subcontractors

As the client, only you have the right to information on the test result and only you receive the documentation of the measurement results. This gives you the opportunity to rework any damaged areas before handover, saving you disagreements with the customer and high complaint costs.

The service of independent and contract-neutral leak testing also gives you a clear competitive advantage with the customer with regard to contract negotiations as you can offer this innovative service as an added value. Independent proof of your good performance!


Leckageortung | NIS Roof Management | Kostensparend, effizient, bewährt | Flachdach-Experten

Leak detection - rapid assistance in the event of damage. Europe-wide.

Flat roofs are often exposed to extreme wind and weather. With our non-destructive methods of leak detection and moisture measurement, damaged areas can be localised quickly, precisely and cost-effectively. The result of the test is documented in a measurement report and serves as a basis for the necessary repairs. This allows you to accurately estimate the repair work required and deploy your personnel in a targeted manner.

Effectiveness that pays off: Our intelligent leak detection system can be applied to almost all roof sealings. Leaks can also be located on roofs with gravel ballast or greenery without having to remove them over a large area. Prior to the test, we will provide you with an assessment of the expected accuracy of the test result based on a grading procedure.

  • Fast, pinpoint localisation
  • Detailed measurement report 
  • Repair costs can be estimated precisely
  • Suitable for almost all roof waterproofing 
  • Highest transparency in the testing process

NIS Safety | NIS Roof Management | Ihr kompetenter Partner für Flachdach-Sicherherheit

NIS Safety - your partner when it comes to playing it safe.

As your reliable team partner, we support you in the planning, assembly, maintenance and testing of all fall protection systems from all manufacturers. Using our digital documentation, which is individually adapted to your company logo, we record all the necessary information for you as proof that the work has been professionally executed in accordance with the currently valid standards and guidelines. Take advantage of our nationwide service from a single source.


NIS Roof Services | NIS Roof Management | Kundendienst rund ums Flachdach | Industrie und Gewerbe

Roof Services - equipped for everything.

Concentrate on your core business and benefit from our nationwide service in the area of maintenance. Whether it's roof maintenance, green roof care or securant inspections - we'll be happy to take on these services for you and carry out the work in compliance with all statutory rules and regulations. If desired, scheduling can be done directly with the client on your behalf.

You will receive a comprehensive maintenance report from us after each maintenance run with documentation of the work carried out as well as the status quo of the roof service. In consultation with you, we will of course produce the documentation in the layout you require at no extra cost.

  • Roof maintenance
  • Green care
  • Securant inspections
  • Comprehensive maintenance protocol
  • Documentation with your logo

NIS Bestandsaufnahme und Katalogisierung | NIS Roof Management | Alles im Blick, auch aus der Luft

Roof Services - Inventory & Cataloguing

Full documentation is worth its weight in gold when you need it. With our interactive roof area cataloguing by means of drone flight, we create 3D documentation for you with true-to-scale, digital image representation. You will receive an exact inventory of the roof surface with all height differences of the superstructures even from inaccessible objects. Transparency really doesn't get any simpler than this.

It’s simply practical to have the roof surfaces on your desk in true detail. Because this way you can conveniently view every square metre of the flat roof and its current status quo for your planning activities. Convince your clients during contract negotiations with the digital 3D documentation of the roof surface or use it during construction meetings to visualise the construction progress.

  • Interactive roof area cataloguing 
  • State-of-the-art drone technology
  • 3D documentation
  • Also for inaccessible objects
  • True-to-scale, digital image representation

NIS Roof Monitoring| NIS Roof Management | R.O.S.I. Sensortechnik | zerstörungsfreies Auslesen der Feuchtedaten

R.O.S.I. - ingenious added value for your customers.

Rely on passive flat roof monitoring with R.O.S.I - and secure ingenious added value for your customer - free of charge. With the maintenance-free and battery-free R.O.S.I. moisture sensors, we offer you a comprehensive monitoring system that enables the non-destructive reading of the moisture values in the roof layer package at any time.

The R.O.S.I. sensors are available free of charge for NIS leak testing. This means that there are no additional product costs for you to calculate to the customer. The installation of the sensors is simple and is clearly explained with the help of installation instructions. Offer long-term added value for your customer's building and use the opportunity to score points with your customers with the innovative R.O.S.I. sensor technology.

Your roof - your innovation. Flat roof 4.0. - thanks to R.O.S.I.

  • Comprehensive monitoring system 
  • Maintenance-free, battery-free humidity sensors
  • Free of charge for leak testing
  • Easy installation by the roofer

Our tender texts

NIS tender texts

Further Information