Back to Window Glossary
A polyurethane foam that is used to fill the spaces in a sash and frame. This foam can increase the insulating value of a window up to 30%.
Definition Flat 4 Side
See What Installations We've Done Near you
View Our Recent Work
Get a Free Estimate for Your Home Improvements
Schedule Your Free Estimate
See More Reviews
Jeff Just said...
"we were very happy with the quality of service and the professionalism of the work crew. "