4000 Series

DESIGNED TO IMPRESS. BUILT TO LAST. Realize your vision for your home with Mastic 4000 Series Replacement Windows. Engineered to meet your aesthetic and functional needs, you’ll find the right sizes, the right designs and the right solutions.

	Pinch fusion-welding construction creates a solid, one-piece unit with no excess variance for long-term durability
	Warm Edge glass spacer system Reduces thermal transfer around the glass perimeter by using a unique U-shaped channel to separate glass panes and interrupt the natural flow of heat to cold; upgrade to Warm Edge+ for enhanced performance
	Integral Interlock Double hung windows feature integral interlock for a weathertight seal and extra security
	New Generation uiPVC vinyl never needs painting or caulking and resists conducting heat and cold
	SilLock design1 Sloped sill with unique SilLock design ensures natural water run-off
	optional R-Core® insulation2 prevents voids and settling and results in even distribution of the maximum insulating barrier
	optional coastal hardware consistently stands up to saltwater and other harsh coastal conditions
	V.I.P. Lifetime Limited WARRANTY (download warranty for complete details)