I paid it all, but the decoration company said they would do the waterproofing for me, but they didn’t ask the property management and the owner to check and accept it. Now the property management wants the owner’s signature to guarantee that if there is water leakage, my downstairs building will be leaked.

According to your statement, there is no way to determine what will happen next and the quality of the decoration company

So it is recommended that you transfer the responsibility

The things guaranteed by signature must be signed by the decoration company Just sign a supplementary agreement with you, and if you are sued for compensation, he will bear the responsibility

If he refuses to sign for you to guarantee the quality of his decoration, you will understand.