Winners of the annual Contractor Projects of the Year competition were announced today by Sika Roofing, the worldwide market leader in resilient and sustainable roofing and waterproofing solutions for non-residential construction projects. 18 winners were recognized for outstanding workmanship among five categories: Low Slope-New Construction, Low Slope – Re-Roof, Steep Slope, Sustainability and Waterproofing for projects completed using a Sika thermoplastic membrane or liquid-applied membrane product.