The property said it was waterproof. Is it safe?

China's waterproof warranty is 5 years, and the property will not do better for you.

If you need a longer protection period, you need to be careful.

For permanent protection, construction is not the most important thing, the most important thing is that the materials can withstand it. If the construction is not good, a freeze-thaw cycle will be finished in a year or so. What can survive depends on whether the materials can bear it. Urea-based waterproof coating is recommended.