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OSI

Nobody Is Tougher in the Battle Against Mother Nature.
O S I Logo.

OSI was born on the jobsite and is a leading provider of professional-grade sealants, adhesives and foams. Our high-quality products, combined with our commitment to training and jobsite support, help to ensure strong, reliable performance with every install.

A man standing on a ladder completing a window installation.

QUAD Window & Door System

Install with confidence. The OSI QUAD System is recommended by leading building material manufacturers and backed by a 15-year limited warranty.

A man applying O S I Quad Max sealant in a green color that matches a home's siding.

Leaders in Color-Matched Sealant Technology

OSI is the leader in color-matched sealant technologies. Pair QUAD and QUAD MAX with 4,900+ colors from leading window, door and siding manufacturers.

Join the Battle Against Mother Nature With the OSI QUAD Window & Door System

Installation Support

To ensure proper installation of sealant products and provide homeowners with additional peace of mind, OSI has a team of professionals with expert knowledge in building science, installation techniques and code compliance. This group offers training and certification programs, flashing system protocol development and install testing services that help ensure reliable, long-lasting results.

Learn How QUAD MAX Protects Your Installs

Discover the Unique Benefits of QUAD Foam

OSI: Tougher Than the Elements

At Lowe’s, we know that you want something that’s tougher than the elements. That’s why we carry a full line of OSI adhesives, caulks and sealants.

OSI products were born on the jobsite, so they make the perfect choice for applications from window and door installations to roofing and gutters. OSI QUAD MAX Caulk and OSI QUAD MAX Sealant provide the industry’s toughest barrier against air and moisture on both new and replacement doors and windows. And, thanks to a 15-year limited warranty* for OSI certified installers, you can rest assured that you’re protected and getting both great quality and value with these products.

Thanks to superior strength, adhesion and flexibility, you can use OSI products with complete confidence regardless of the weather. Whether using OSI Drywall Adhesive for putting up walls or OSI Spray Foam Insulation to seal windows and doors, you can count on OSI for strength and reliability. And each product’s designed to hold strong to a combination of building materials, including vinyl, PVC, aluminum, metal and more — ensuring a job well done for years of worry-free wear.

OSI is the leader in color-matched sealant technologies. OSI QUAD Caulk and QUAD MAX are available in more than 4,900 OSI QUAD Caulk colors from leading window, door and siding manufacturers. OSI Window Seal and OSI Window Caulking are also available in paintable clear and white formulas.

When you choose OSI sealants, OSI caulks, or OSI tapes and foams, you’re getting premium-grade construction materials at an incredible value. Shop Lowe’s stores or Lowes.com to see our entire selection and enjoy the confidence that comes with professional, construction-grade products.

*For complete warranty details, please visit OSITough.com.