The other lead to is the fact that the wear layer on the waterproofing program has been neglected and easily worn out. Evidence of the, is blistering floor, chipping from the mortar, and occasionally a hole. See the picture underneath captures the put on layer blistering and floor cracks https://moodjhomedia.com/story1979214/a-review-of-resurfacing-concrete-in-westminster-ca