Profile: Alpha Window Systems Ltd. specializes in premium windows, and in siding & roofing structures. Our products include casement windows, awning windows, double hung windows, slider windows, sliding doors, basement turn tilts and garden box windows. Our casement windows system is designed around high performance hardware and high-tech compression seals. Our roofing shingles are fiberglass strip shingles. Our mounting blocks are suitable for light fixtures, mailboxes, doorbells, exhaust vents and fans. Our thicker glass effectively reduces heat loss in the winter by reflecting infrared heat radiation.