PURPOSE:To prevent damage by impact to waterproof sheet and insulator sheet by a method in which a waterproof curing sheet made of a specific elastic material is provided between the waterproof sheet and the insulator sheet in the course of waterproofing work. CONSTITUTION:In a waterproofing work, a concrete base 1 coated with an adhesive 2 is covered with a waterproof sheet 3 and further with a waterproof curing sheet 6, and concrete 5 is placed on them through an insulator sheet 4. The sheet 6 is composed of rubber asphalt mixed with vulcanized rubber powder of a grain size of 0.2-2mm. Since impact to the sheets 3 and 4 can be absorbed by the sheet 6, damage by impact to the sheets 3 and 4 can be prevented.
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