The other lead to is The truth that the have on layer of the waterproofing technique continues to be neglected and easily worn out. Proof of the, is blistering area, chipping from the mortar, and in some instances a gap. See the image under captures the don layer blistering https://pageoftoday.com/story3056388/the-definitive-guide-to-waterproofing-contractors-in-westminster-ca