我国的《屋面工程技术规范》对屋面防水分为永久性工程和非永久性工程，永久性工程中又根据工程性质，对国家、人们生活重要程度和使用功能要求分为Ⅰ～Ⅲ级，IV只适用于非永久性工程。同时对其不同设防所用的材料也有不同的要求。建筑物表面装饰工程也需要分等级的进行防水设防，因为每个建筑的构成结构不一样，建筑物的材料属性不一样，所以对防水的要求有着不同的要求。
根据防水等级、设防要求和工程实际情况确定防水设计方案和选择防水材料建筑物防水工程的防水设计方案和防水材料的选用,应根据建筑物的防水部位、类型性质、重要程度、使用功能、结构特点、耐久年限、气候条件和工程具体情况等综合因素来确定。
According waterproof rating, fortification requirements and engineering design determined waterproof waterproof design and selection of building waterproofing waterproofing materials and selection of waterproof material, waterproof parts of the building should be based on the type of nature, the importance of using the function, structure characterized by a combination of factors, durable life, climatic conditions and project specific circumstances, such as to determine.
特别重要和防水有特殊要求的建筑，防水层的合理使用年限在25年左右，防水材料可选择合成高分子防水卷材、金属板材、高聚物改性沥青防水卷材、合成高分子防水涂料、细石防水混凝土等材料，设防要求在三道或三道以上防水设防。
Particularly important and waterproof construction with special requirements, reasonable service life of the waterproof layer is about 25 years, choose synthetic polymer waterproof material waterproof membrane, sheet metal, polymer modified bitumen membrane, synthetic polymer waterproof coating , fine stone waterproof concrete and other materials, fortification requirements in three or three more waterproof fortification.
重要的建筑和高层建筑，防水层的合理使用年限在15年左右，防水材料可选择高聚物改性沥青防水卷材、合成高分子防水卷材、硅酸钙板、金属板材、合成高分子防水涂料、高聚物改性沥青防水涂料、细石防水混凝土、平瓦、油毡瓦等材料，设防要求在二道以上防水设防。
Important buildings and high-rise buildings, reasonable service life of the waterproof layer is about 15 years, waterproof material optional polymer modified bitumen membrane, synthetic polymer waterproofing membrane, calcium silicate board, sheet metal, synthetic polymer waterproof coatings, polymer modified asphalt waterproof coating, waterproof fine stone concrete, flat tiles,shingles and other materials, fortification requires two or more waterproof fortification.
一般的建筑，防水层的合理使用年限在10年左右，防水材料可选择三毡四油沥青防水卷材、高聚物改性沥青防水卷材、合成高分子防水卷材、金属板材、高聚物改性沥青防水涂料、合成高分子防水涂料、细石防水混凝土、平瓦、油毡瓦等材料，设防要求在一道以上防水设防。
General construction, reasonable service life of the waterproof layer is about 10 years, waterproof material choose three felt four oil bitumen membrane, polymer modified bitumen membrane,synthetic polymer waterproofing membrane, sheet metal, high-poly modified bitumen coating materials, synthetic polymer waterproof coating, waterproof fine stone concrete, flat tiles, shingles and other materials, requires a more waterproof fortification fortification.