It depends how your waiver of liability is written.
In the waiver you have to be very specific about what has been asked of you. You then need to write the specifications pertaining to what they wish for you to do, against the grain, so to speak. Then you explain what is going to happen to the project after it is completed in that manner. Then in bold capital letters... THIS IS MEANT TO ONLY BE A TEMPORARY INSTALLATION. All temporary installations are done with the understanding that a full and complete replacement or correction to the customer's satisfaction is eminent. Any and all additional time and labor incurred. As a result, you will be billed for the additional labor as per our most recent price list.
Every time I present this waiver, the change order appears!!
Heck, the NWFA has a waiver form, so they must believe in them working.
Name one person that loves to hear those golden words, "I told you so"