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Try waterproofing using a TanTan Onetan waterproof agent at concrete rooftop~
It's a one-component waterproof agent that can complete primer, intermediate coat, top coat at once!
If you use it with a reinforcement fabric, it also has the effect of sheet waterproofing.
Work on the most problematic corner and drain pipe first with a reinforcement fabric,
and constructed the entire floor with a Onetan waterproof agent and reinforcement fabric.
Try following the video~ ^^