Why OSI

OSI takes the best practices from years of experience in new-home construction and brings that expertise to replacement windows. WINTeQ™ Window Installation System is the cornerstone, a completely compatible line of products that remove the guesswork from replacement window installation.

The First Complete & Compatible Window Installation System

WINTeQ™ New Construction: Sill Pan Method

WINTeQ New Construction Sill Pan Method

WINTeQ Warranty CertificateDownload a sample copy of our
WINTeQ™ System Warranty.

To accommodate window manufacturers that require a drainage plane for their window installations, Henkel has now developed the Sill Pan Method for new construction installation utilizing the revolutionary WINTeQ™ System with the three specially developed products TeQ::Foam, TeQ::Seal and TeQ::Flash to work together to eliminate the most common problems of window installation, including energy loss and water penetration.

Mounting flange windows are generally used in buildings that incorporate a "Membrane/Drainage System" (exterior weather barrier). Mounting flange windows are designed to integrate with the weather resistant barrier and flashing materials. When installed following the WINTeQ™ System Window Installation guidelines the completed assembly will provide excellent energy efficiency and protection from water infiltration.

Mounting flange windows are designed to be installed with fasteners that secure the window through the mounting flange to the building sheathing or rough framing members. In some cases sheathing is not installed around the perimeters of windows and doors. The installation of the WINTeQ™ System window Installation and ASTM window and door installation standards require that sheathing is in place prior to window installation.