https://www.fearsteve.com/News/how-upvc-window-gaskets-affect-air-and-water-tightness/ A UPVC window may have a strong frame, good-quality glass and properly fitted hardware, yet still allow air or water to pass through if the gaskets are not doing their job. Gaskets are small components fitted around the glass and other parts of a UPVC window system. They create a flexible seal between surfaces that need to remain tightly closed while also allowing for movement caused by temperature changes, pressure and normal use. Fri, 23 Oct 2026 11:36:48 UTC en