Who's liable if your waterproofing job fails? Warranties and what to ask

This is general information, not legal advice. If you’re dealing with a specific dispute, consider consulting an attorney or contacting the Wisconsin Department of Agriculture, Trade and Consumer Protection about your options.

A waterproofing job that fails a year or two after it’s done is a homeowner’s worst version of this project, paying once and then facing the same wet basement again. Here’s how warranty and liability actually work, and what to check before that becomes your problem.

What a warranty is actually promising

A waterproofing warranty is the contractor’s written commitment to fix or redo the work if it fails within a set period, for reasons the warranty covers. That last part matters: warranties typically exclude damage from causes outside the original scope, like a homeowner regrading the yard back toward the house after the work was done, or a completely separate plumbing leak being blamed on the waterproofing system.

Warranties generally cover two things, and it’s worth knowing which one you’re actually getting. Materials warranties cover product defects and are sometimes backed by the manufacturer rather than the installing contractor, which can matter if the contractor later goes out of business. Labor or workmanship warranties cover the installation itself and are almost always tied to the specific company that did the job, meaning they disappear if that company closes.

What to ask before you sign

Question	Why it matters
Is this a materials warranty, a labor warranty, or both?	Determines what’s actually protected and by whom
How long does it last?	Ranges widely; get the specific number in writing
What voids the warranty?	Common exclusions include changed grading, new construction disturbing the system, or unaddressed plumbing leaks
Is the warranty transferable if I sell the house?	Matters for resale value and disclosure conversations
Who do I contact if there’s a problem?	Confirm this is the actual company, not a subcontractor who may not answer later

Reading the track record, not just the promise

A warranty is only as good as the company standing behind it. Longevity and consistency matter here: a company that’s been doing this work in Rock County for years, with a track record of returning to fix issues without a fight, is a meaningfully different bet than a newer operation offering a longer warranty on paper. Reviewing how a company has actually handled past callbacks, not just what their warranty document says, is one of the more reliable signals available before you hire. Checking that the company is actually licensed and insured in the first place is the step that comes before any of this.

Why liability disputes happen more than they should

Most warranty disputes we see referenced in local contractor reviews don’t come from outright bad actors. They come from a mismatch between what a homeowner assumed the warranty covered and what was actually written down, or a vague verbal promise that never made it into the contract. A homeowner who assumed “warranty” meant everything, forever, is in a very different position than one who confirmed in writing that the labor warranty runs 10 years and covers reseepage at the specific wall that was treated. The dispute usually isn’t about whether the company is trustworthy, it’s about whether the terms were ever pinned down clearly enough to enforce.

This is also why a scheduling or communication gap during the original job matters more than it might seem. A crew that shows up when promised and explains what they’re doing tends to be the same crew that responds when you call about a callback. One that was vague or hard to reach from the start is a preview of how a warranty claim is likely to go.

If a fix doesn’t hold

Start by documenting the problem: photos, dates, and a written description of what’s happening now versus what was promised. Contact the contractor in writing, referencing your contract and warranty terms specifically, and give them a reasonable chance to respond before escalating.

If the contractor is unresponsive or refuses to honor a warranty they issued, the Wisconsin Department of Agriculture, Trade and Consumer Protection accepts and investigates complaints against home-improvement contractors for exactly this kind of dispute. For amounts within the relevant limit, small claims court is also an option, and having your written contract and warranty terms on hand makes that case considerably easier to make.

The Rock County Waterproofing Guide home page tracks how consistently local contractors follow through after the job is done, not just their star rating, and our ranking method explains how that factors into the scores you see on this site.