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许多人问:《屋面工程技术规范》(GB 50207-94)规定房屋分为四个等级,按不同等级,进行设防。一道的,二道的,三道的。一道是什么意思?是不是一层就是一道?比如用涂料,向左一刷子,是一道;然后向右又一刷子,又是一道,往返三五刷,就是三五道;或者用三毡四油防水,是七道设防,对不?回答是错的。 所谓“道”,在规范第2章术语的第二条指明:“一道防水设防:具有单独防水能力的一个防水层次。”这句话的核心是:“单独防水能力”,没有单独防水能力,就不能视为一道。于是又会理解:所有防水材料,都能单独防水,如塑料油膏一布两涂,一毡
Many people asked: “Technical Specification for Roof Engineering” (GB 50207-94) stipulates that houses are divided into four classes and are fortified at different levels. One, two, three. What does it mean? Is it a layer or a layer? For example, with paint, brush to the left is a line; then another brush to the right, and it is a line, a round-trip three-fifth brush, that is, three or five lines; or use three felt four Oil waterproofing is a seven-way defense. Isn’t it? The answer is wrong. The so-called “Tao”, the second article in the specification of the second chapter of the term specifies: “A waterproof fortification: a waterproof layer with a separate waterproof capacity.” The core of this sentence is: “Individual waterproof capacity”, there is no separate waterproof capacity, It cannot be treated as one. It will be understood again that all waterproof materials can be waterproofed separately, such as a plastic ointment, a cloth and a felt.