Offering a written warranty on a waterproofing job is one of the strongest sales arguments against the competition, but it only works if the client clearly understands what it covers and what it doesn't.
Usual terms depending on the system
The commercial warranty given by the professional (separate from the legal warranty on the work) usually ranges between 2 and 5 years for paint or liquid membrane systems, and can reach 10 years or more in higher-cost systems such as quality asphalt sheets or polyurea, provided the recommended maintenance has been respected.
What it should cover
A reasonable warranty covers material or application failures (peeling, premature cracking not caused by structural movement, loss of watertightness under normal conditions of use). It is important to document the initial state and surface conditions before starting, so you can show that the failure doesn't come from a prior problem the client did not disclose.
What is usually excluded
Damage from structural movements of the building, later modifications by third parties (drilling, new anchors), lack of the recommended maintenance, or improper use of the surface (unforeseen traffic, aggressive chemicals) are usually excluded from the warranty, and it's wise to put this in writing from the quote stage.
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