單層屋面是指用單層PVC、TPO、EPDM等防水卷材外露使用，以機械固定、空鋪壓頂、滿粘方式進行施工的屋面系統。單層屋面構造包括單層屋面防水卷材、保溫板、隔汽材料、固定件、系統配套件等，適用于工業與民用建筑，特別是鋼結構平屋面及異型屋面的防水工程，具有防水保溫性能好，使用壽命長、施工快捷、易檢修、長期性價比優等特點，能夠徹底解決傳統金屬屋面的滲漏問題、冷凝水問題，下雨產生的噪音問題、出屋面防水處理難等問題，在歐美等發達國家已得到普及應用，成為平屋面工程中最重要的屋面形式。
Single-ply roofing mainly refers to the roofing system that uses exposed single-layer PVC, TPO, EPDM or other waterproofing membrane, and its installation methods including mechanical fixing system, loose laid system, and fully adhered system.Single-ply roofing system includes waterproofing membrane, insulation board, vapor barrier, fixtures and system supporting parts, etc., It is suitable for industrial and commercial buildings, especially for the steel structure flat roofs and special-shaped roofs because of many advantagessuch as long service life, fast installation, easy maintenance and long-term cost-effectiveness, etc., Furthermore, it can completely solve the problems of leakage, condensate, rain noise, difficult roof details treatment caused by metal roof.single-ply roofinghas been widely used in Europe, America and other developed countries for many years and it becomes the most important roofing form in flat roofing projects.