Waterproofing Contractor Insurance

In most states, waterproofing is a trade. In Washington, it's THE trade. The western half of the state gets 37 to 60 inches of rain a year, the soil stays saturated for months, and your membrane is often the only thing between a dry building and a ruined one. The infamous condo water-intrusion lawsuits of the early 2000s — the cases that reshaped Washington defect law — were largely building envelope and waterproofing failures.

That history defines your risk: the buried mistake. A foundation membrane disappears behind backfill the day you finish. Nobody can inspect it. If the surface prep was rushed, the product misapplied, or the membrane punctured during backfill, water finds the flaw — and shows itself years later as a stained basement wall with extensive damage behind it. Washington's defect statute (RCW 64.50) gives owners six years, and waterproofers are routinely named first in envelope litigation. Completed operations coverage isn't a feature of your policy here. It IS your policy.

The chemistry adds risk while you work. Solvent membranes, urethanes, epoxies, spray systems — VOCs and isocyanates that demand respirators and ventilation, plus overspray and runoff that can bring the Department of Ecology to your job site. Hot-applied rubberized asphalt in a confined space stacks fire risk on top.

And the workplaces themselves are hostile: excavations with cave-in risk, elevator pits, crawl spaces with bad air, scaffolding on multi-story exteriors. Below-grade work is claim-dense before the water even shows up.

Washington requires L&I registration and a $15,000 specialty bond. What matters is a carrier that understands long-tail envelope risk and writes completed operations accordingly — limits sized for the lawsuit that names everyone, six years out. That's the policy we build for waterproofers, because in this state, yours is the trade the lawyers remember.