OSI is on a mission to make every structure tougher than the elements. Our sealants, adhesives and foams set the standard for building envelope performance. And our professional training, application information and nationwide support network provide a powerful industry resource that helps raise the professionalism of the window, door and siding markets. With more than 50 years of on-the-jobsite knowledge and deep building science expertise, OSI is the leader in building products and services designed for professionals.
Featured Products
The house that tough built. And that Mother Nature can't touch.
OSI’s Application Center is a hub for building envelope innovation.
The sealant that stands up to the elements.
QUAD® MAX sealant is the toughest defense against the elements.
Match the sealant to...well, anything.
QUAD® MAX can be color matched to leading manufacturers' palettes.
OSI Tough
Discover the world of OSI Tough!
The knowledge to make every install a tough, state-of-the-art job.
OSI’s expertise can help raise any installer’s game. And reputation.
More from JLC
20 Products You Might Not Know Are Made in the USA
Using combinations of local materials and local labor, many products you use are made right here in the States.
More
OSI's Certified Installer Program
"Ninety eight percent of leaking windows are due to the install, not the window," says sealant-maker OSI. Their solution: Certify the installer and guarantee the install.
More
OSI Quad Max Sealant
The new Quad Max formula offers strong adhesion to a wider variety of building materials as well as greater stretch than other sealants, the manufacturer says.
More