Waterproof structure for architectural foundation and building on which said structure is applied

摘要

PROBLEM TO BE SOLVED: To provide a waterproof structure for a building substrate, which has waterproofness high enough to be required for a roof underlayment material.SOLUTION: A waterproof structure 1 for a building substrate, which includes a waterproof film layer 10 and a water-absorbing swelling layer 20, is characterized in that the water-absorbing swelling layer 20, which comprises water-absorbing particles 24 and an adhesive 22, is provided on the undersurface side of the waterproof film layer.