ZS LLC

At ZS, we offer a comprehensive range of Building Enclosure Consulting and Testing Services designed to help ensure the long-term performance and integrity of building envelopes.
One of the most important testing methods we perform is ASTM E1105, the industry standard for evaluating the water pe*******on resistance of installed exterior windows, doors, skylights, curtain walls, and storefront systems. This testing helps verify that products have been manufactured and installed correctly and are performing as intended in real-world conditions.
For both residential and commercial facilities, building enclosure testing plays a critical role in identifying potential issues before they become costly problems. Water intrusion can lead to structural damage, material deterioration, mold growth, and expensive repairs. By detecting leaks early in the construction process, project teams can address deficiencies before occupancy, saving significant time and money down the road.
Whether it's new construction, quality assurance, or forensic investigation, ZS is committed to helping clients deliver safer, more durable, and higher-performing buildings.

Celebrating 14 Years of Excellence!
Everyone at ZS would like to congratulate our Fall Protection Manager, Marko Coralic, on an incredible 14 years of dedication, expertise, and outstanding service.
Marko has built a reputation as a trusted expert in Fall Protection and Building Access, consistently demonstrating an exceptional commitment to safety, quality, and attention to detail. His extensive industry knowledge and unwavering dedication have helped make facilities across the country safer for workers and maintenance teams alike. We are grateful for Marko's contributions to the success of ZS and the positive impact he continues to make for our clients and the industry as a whole.
Thank you, Marko, for 14 remarkable years. We look forward to many more!

Proud to be recognized as one of Milwaukee's Best Places to Work!
At ZS, our Annual Brewers Outing is more than a company event. It's an opportunity for team members to bring their families and loved ones together for an evening of great food, fun, and camaraderie. It's a reflection of what makes ZS special: we're not just colleagues, we're a team that genuinely enjoys spending time together.
Here's to another exciting Brewers season and another year of growth, success, and shared experiences at ZS!

ZS Has Moved to the Chicago Loop!

We’re excited to share that our Chicago office has officially moved from Hyde Park to the heart of the Loop at 327 S. Plymouth Court, Suite 300! Our new location brings the ZS team closer to many of our Chicago clients and puts us in the center of one of the city’s most vibrant business districts.
We look forward to continuing to serve our Chicago clients from our new location and becoming an even bigger part of the Loop community!

Pictured here, ZS Principal-in-Charge Ziad Salameh and Architectural Engineer Andrew Marszalkowski ride a mast climber platform at the 12th floor of Detroit's iconic Fisher Building while reviewing project progress. The visit provided a firsthand look at the ongoing restoration and continued transformation of one of the city's most treasured landmarks. We are honored to support the preservation of this historic architectural gem for future generations.

Congratulations to Petr, Ziad, and Craig as they celebrate another year with the ZS team! We’re grateful for your continued dedication, hard work, and the many contributions you make to our organization.

Congratulations to Carmen Schools of Science and Technology on the opening of the new Southgate Campus! ZS was honored to contribute Building Enclosure Consulting and Water Testing services to this exciting project.
We’re proud to have helped bring this exceptional new educational facility to life and wish the Carmen community continued success.

🌟 Celebrating Our Summer Interns! 🌟
As another summer comes to a close, we’re taking a moment to recognize the incredible interns who joined the ZS team this year!
We were proud to welcome Austin Jordan, Aidan DeGrave, Riley Ott, Ethan Mann, and Nicole Necka to ZS. Throughout the summer, they brought fresh perspectives, enthusiasm, curiosity, and a willingness to jump in and learn. We were especially excited to welcome Riley Ott and Ethan Mann back for their second summer as ZS interns and continue watching their skills and experience grow!

Congratulations to Jeff Martin on earning his Whole Building Air Tightness Technician (ABAA) Certification. This accomplishment highlights Jeff's commitment to professional growth and helps strengthen the expertise we bring to every project.
Way to go, Jeff! 👏

ZS is proud to have been part of the team recognized by the Milwaukee Business Journal for the 2026 Real Estate Project of the Year- - The Milwaukee Repertory Theater.
ZS provided water infiltration testing services for this project, helping ensure a high-quality, long-lasting building.

https://www.bizjournals.com/milwaukee/news/2026/04/23/milwaukee-rep-center-stage-project-year-2026.html?utm_source=st&utm_medium=en&utm_campaign=BN&utm_content=ML&ana=e_ML_BN&j=45359301&senddate=2026-04-23