防水劑的作用就是阻擋木質材料對水分的滲入和滲出(揮發更確切)，木質材料由于吸收水分而膨脹，會引起木質材料變形；木質材料由于水分的揮發而收縮，也會引起木質材料扭曲變形。
Waterproofing agent role is to stop the woodiness material of water infiltration and seepage (volatile rather), woodiness material expansion due to absorb moisture, and will cause woodiness material deformation; Woodiness material shrinkage due to evaporation of moisture, and can also cause woodiness material distortion.
有機硅防水劑是由甲基硅醇鈉為基材，在水和二氧化碳作用下，生成甲基網狀樹脂膜(即防水膜)的一種憎水性防水劑。除了用于房屋防水，在石材防護中，有機硅防水劑 也發揮著重要作用。
Organosilicon waterproofing agent is composed of sodium methyl silicone glycol as the base material, under the effect of water and carbon dioxide, the methyl reticular resin film (that is, the waterproof membrane) of a hydrophobic waterproofing agent. In addition to building waterproof, in stone protection, organosilicon waterproofing agent also play an important role.
無機鋁鹽防水劑是以無機物為主體材料的水泥砂漿、混凝土防水劑。它以防水抗滲功能為主，同時兼有微膨脹、增加密實度功能，根據工程需要可配制成減水、緩凝和早強等型號。該防水劑防水效果好，施工簡易，工程造價低廉，適用于砂漿、混凝土結構地下工程、水池、水塔、橋梁、涵洞、隧道、碼頭、堤壩水電站等新建工程的剛性結構自身防水。
Inorganic waterproof agent is a inorganic aluminum salt as the main materials of cement mortar, concrete waterproofing agent. It is given priority to with function of waterproof impermeability, micro expansion concurrently at the same time, increasing the compactness of function, according to the needs of engineering can be made into water reducing, retarded and early strength model. The waterproofing agent waterproof effect is good, simple construction, low engineering cost, applicable to the cement mortar, concrete structure of underground engineering, pool, water towers, Bridges, culverts, tunnels, terminals, such as hydropower station dam construction project of rigid waterproof structure itself.