Windows, like anything else that remains outdoors, endure constant abuse. Whether it’s fluctuating barometric pressure, temperature extremes or the constant bombardment of UV rays, windows must be able to withstand and endure the elements in order to keep a home comfortable and beautiful.

AAMA & NFRC Certified

Our reputable and lengthy track record of proven performance and customer satisfaction is a result of over 40 years of insistence on the highest industry standards. We regularly test all of our windows according to stringent National Fenestration Rating Council (NFRC) and American Architectural Manufacturers Association (AAMA) standards. These tests are voluntary, but we make it a company policy to push our products to the limit.

The Tests We Conduct

We are unswerving in our commitment to maintain and improve the quality of our products. To ensure this, LbL windows undergo rigorous stress testing to pass and exceed these tough standards.

• Weatherability Test
  The AAMA Weatherability Test verifies the vinyl’s ability to retain color and withstand impact when exposed to various climates.
• Heat Resistance Test
  By exposing our vinyl profiles to temperatures as high as 300° F, AAMA can test for stress-related surface changes such as blistering, cracking and warping.
• Structural Performance
  LbL windows meet or exceed structural performance standards established by AAMA. Performance tests include resistance to air infiltration, water leakage, forced entry and wind load pressure.
  
• Real-Life Testing
  We use a specially-built house in the Arizona desert to conduct long-term field tests on each of our windows. A southern exposure and air conditioning duplicate the demanding daily conditions experienced by a real home.