Experience with Sarnafil® AT:
Interview with a Customer - Leister Technologies AG

Why did you choose Sarnafil® AT? ​
We regard the durability and long-term performance of a roof as key criteria and the reason we selected Sarnafil® AT. This system is also highly resistant to mechanical damage, flexible and easy to weld, which are attributes that make an owner comfortable that they will have a watertight roof for many years. Sika has been in the roofing business for more than 60 years and is recognized as a leader in roofing technologies and as a solid partner world-wide, as are Leister, so we are convinced that Sarnafil® AT is the right choice for this important project. ​

​How important are sustainability and environmental protection for Leister?​
Extremely important! We are convinced that we must take responsibility and contribute to environmental protection. This is also why we are investing to make this a Solar PV roof.​

​Would you recommend the Sarnafil® AT system to other building owners?​
Yes, we are fully convinced of the advantages and very satisfied with the results.​

What was your experience with the Sarnafil® AT membrane system, especially in terms of its weldability, flexibility, application speed?​
The Sarnafil® AT membrane is extremely easy to weld and with the wide welding window the installer can easily achieve the right parameters. This creates confidence and a good weld can be achieved in a relatively short time, which increases the overall installation rates.​ Additionally, the Sarnafil® AT is highly dimensional stable, even at lower and higher temperatures. For example, on site we measured membrane surface temperatures changes of up to 80° C between day-time highs and night-time lows, and no wrinkling was visible on Sarnafil® AT​.

​Would you recommend Sarnafil® AT to other roofing installers and contractors?​
Yes definitely, we are very satisfied.​ Due to the flexibility of the Sarnafil® AT membrane, plus use of the new self-adhered system, the installation time was significantly reduced, and the roof was completed on time, or even before originally scheduled.

​How was the support from Sika regarding site training, detailing solutions, response time for any questions, etc. ?​
I was very pleased. We received very professional support from Sika's Technical Services people throughout the site installation works. The initial training on-site was also good at creating trust and confidence for the new product line. The collaboration was all very good. ​

How was the membrane processing speed compared to other common roofing membranes, e.g. the self-adhesive membrane for the upstands?​
The application of the self-adhered Sarnafil® AT membrane on the parapets was very easy, even though we were doing it for the first time. Another plus for the self-adhered AT technology is that you do not need any chemical products on the roof – So the installation is totally free of solvents - which also supports Leister’s environmental protection initiatives.

Roofing area: Sarnafil® AT
Upstands: Sarnafil® AT FSA P (self adhered)
Insualtion: EPS / tapered PIR
Vapour Control Layer: Dörr-Tiralbit AL-E sk/Safeguard (self adhered)
Roofing structure: Trapezoidal metal deck