We specified YKK curtain wall and storefront products for our windows on our home. YKK, who is a nationally recognized manufacturer of commercial curtain wall and storefront products, recommended a local installer who was supposedly qualified to install their product. After detailed forensic investigations by two qualified exterior building envelope specialists it was determined that the installer improperly installed the YKK products and left us with a house that has significant water infiltration and leaks. Neither the installer, All-American Glass, or YKK is willing to help us correct the defective installation or provide any assistance regarding the remedial action required to prevent further water infiltration. YKK recommended the installer and assured us that All American was a trained and qualified installer of their products. We continue to have significant interior damage to our floors and drywall due to the water infiltration as a result of the incorrectly installed window system. We do not recommend the YKK product or the installer, All-American Glass.