PURPOSE: To improve the constructing performance of work and reduce the cost by fixing plywood backing to a structure of the specified construction area or less, and placing mortar of the specified thickness thereon as a waterproofing method for a general dwelling house.

CONSTITUTION: Concrete panels of about 9mm in thickness are fixed to the backing of a house structure of about 200m2 or less in construction area by nails or the like. Butyl rubber tapes of about 1mm in thickness and about 50mm in width are bonded between the panels and between the panel rising edges by an adhesive. Butyl rubber tapes of about 1.5mm in thickness and about 50mm in width are further bonded with lap width of about 50mm. Mortar of about 30mm in thickness is then placed thereon and cured for a specified period to complete waterproofing work. A construction period, construction labor, weight, and the like can be thereby shortened or reduced.