EFFICIENCY WITHOUT COMPROMISE

SLIP™: The Slim, Smart Upgrade for Historic Windows.

SLIP is a high-performance insulating solution engineered for use in historic and retrofit window assemblies. Installed over existing glazing, it enhances thermal performance without altering original sash profiles, materials, or sightlines—making it ideal for preservation-sensitive projects. Most original wood windows have already lasted 80 to 100 years, and with proper restoration and a SLIP insulating system, they can easily outlast modern replacements that often degrade in just 20–30 years.

OUR APPLICATIONS

Window SLIP Applications

Heritage Regulation Compliance

For buildings under historic registry, visual integrity and reversibility are key to compliance. SLIPs meet these standards while providing discreet thermal upgrades. They preserve original sash, muntins, and profiles—meeting requirements for both residential and commercial preservation boards.

Energy Efficiency

Older windows can be very high quality, but if the original window glass is single pane, you are likely losing heat or cold through those windows, driving up the cost of your energy bill. Our SLIPs can reduce your energy bill by up to 72% and will help improve energy efficiency for the life of the windows.

Cost-Effective Upgrade

Adding a SLIP is a cost-effective upgrade solution compared with window replacement. A permanent, more stylish version of a storm window, SLIPs extend the life of your existing windows and maintain the home’s look and feel, while providing modern double-pane efficiency.

OUR COMPANY

From a Trusted Name in Window Repair and Restoration Comes an Innovative Efficiency Solution

SLIP is a sustainable solution that allows you to maintain what you have rather than taking on the expense of replacing existing windows. We are a part of the Chosen Wood Window Maintenance family, with a team that boasts decades of experience repairing, restoring, optimizing, and creating new solutions for windows.

More Information: https://windowslip.com