Welcome to TLS Laboratories - Your Window & Door Experts

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About TLS Labs

Our firm helps homebuilders, architects and homeowners prevent and manage water intrusion issues. We provide expert advice utilizing industry best practices in product selection, installation methods, and installer training.

What We Do
  • Provide Expert Witness Services to the legal community
  • Conduct destructive investigation and water testing of homes and commercial properties to identify and solve water intrusion problems
  • Conduct 3rd party inspections of window and door installations
  • Consult with window and door manufacturers to develop products that keep water out of homes
  • Testing existing methods and materials used by builders to determine their performance characteristics
  • Assist clients with product selection
  • Develop effective window and door installation methods
  • Provide training for window installers
  • Provide spray rack calibration services to other water intrusion and inspection companies

Experience, Honesty and Professionalism

No other organization has the real world experience of the TLS Laboratories team. We have diagnosed and solved more leaks, in more different types of buildings than any other organization that we are aware of.

We believe in the old adage "honesty is the best policy". As our existing clients can attest, we always deliver a concise and professional evaluation of each project. Whether on site for a large home builder, working at a private residence, or providing professional witness services to the legal community, you can depend on us.

Inspection Services, Products and Training Solutions

TLS Labs provides in-field forensic leak detection for commercial and residential buildings. We are experts in leak detection during the course of construction or in owner occupied homes.

We even have own patented flashing system called Corner Flash™. It is a three dimensional flashing product that takes the guesswork out of flashing recessed or inset windows. Corner Flash™ and our method of installation have been thoroughly tested and proven to effectively flash recessed windows.

Additionally, TLS Labs offers the industry leading Synergy Project to train and certify builders using our techniques. The Synergy Project is a program designed to train contractors and their employees to properly install windows and doors. Using our products and time-tested installation methods builders can deliver homes with a flashing system that eliminates rain related leaks.

TLS News for July 4, 2009

New Installation Videos Are Here!

You've asked for it, and we're delivering. Today, we've added a new selction to the website that has new installation videos for our products.

Check them out for yourself, here


Expert Witness Services

For over 10 years our president, Gene Summy has been called on as an expert witness in cases across the nation.
Specializing in:
  • Windows
  • French Doors
  • Fenestration
  • Flashing and Window Installation
  • Stucco and Building Envelopes
  • Field Testing
Click Here To Learn More
New GS Flex Products available from TLS Labs

We're proud to introduce a new Corner Flash™ line called GS Flex. These new corner flashing pieces are constructed using high-grade flexible PVC. Our state-of-the-art injection molding process creates a high quality product that saves you money. Read more about GS Flex™ | View installation video

Proudly made in the U.S.A.


See all of our products in our online catalog.

What are people saying about us?
My client, a window manufacturer, was alleged to have defectively designed and manufactured windows installed in hotels nationwide. Gene Summy and TLS Labs had the experience and knowledge necessary to help us defend the case. Gene was able to identify defects in the building envelope that allowed for water infiltration. He was critical of the testing methods used by another window testing company that didn’t follow AAMA standards, and ultimately helped us posture the case for settlement.
- Cecilia A. Horan
Hinshaw & Culbertson LLP
Chicago, Illinois
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