Specific reference is as follows:

The contract is the whole project of family decoration, not a separate waterproof contract; However, in this signed contract, it is important to see whether the waterproof production is clearly listed in the contract, how many times it is brushed, how high it is brushed, and whether it is marked;

Now there is a separate waterproof project on the market, only for waterproofing. If you cooperate with them, you need to sign a contract, how to do it, how many years of warranty and so on.