Alsysco Casement Windows accommodate single and double glazing glass from 4mm to 25mm. Its high performance 16mm stainless steel friction stays allow for larger than normal sash sizes. An innovative design provides excellent sealing against water and air infiltration with improved water drainage, which is allowed through a hollow sump sill design. Reliable and secure locking mechanisms give you peace of mind. Our manufacturing tools and jigs ensure production and installation accuracy for a seamless transition from the show room to your home. All Alsysco sliding windows and doors comply with stringent AAAMSA design standards.