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1988年美国各种防水材料的应用比例见下表。其中用于旧建筑维修的防水施工面积与新建筑的防水施工面积差不多,用于维修的防水材料占防水材料市场的50～55%左右。
In 1988, the proportion of all kinds of waterproof materials in the United States is shown in the following table. The waterproof construction area used for the maintenance of old buildings is similar to the waterproof construction area of new buildings. The waterproof material used for maintenance accounts for about 50 to 55% of the market for waterproof materials.