Moisture moving up through a concrete slab is one of the most common — and most preventable — causes of coating and flooring failure. Here's how to know if your project actually needs a vapor barrier, and why Oregon's climate makes this more relevant than in a dry state.
Concrete is porous, and moisture from the ground below — and, in a wet climate, moisture that's had less opportunity to fully evaporate from the slab — can migrate up through it over time. A vapor-barrier coating or membrane blocks that migration, protecting whatever coating or flooring sits above the slab.
Moisture testing — using calibrated meters or calcium chloride test kits — measures the actual vapor transmission rate from your slab. In Oregon specifically, testing during a dry summer stretch can understate what your slab experiences during the wetter months, so we account for seasonal variation rather than relying on a single dry-weather test.
Persistent rainfall and coastal humidity mean Oregon slabs are exposed to more ongoing moisture than slabs in a dry climate, making moisture testing a genuinely higher-value step here rather than a formality.
Yes — vapor-barrier coatings aren't just for new construction. If you've had a coating or flooring failure that turned out to be moisture-related, a vapor-barrier system can be applied to the existing slab as part of remediation.
Concerned about moisture in a new build or a slab that's failed before? Oregon Polyurea offers moisture testing and vapor-barrier coating services — reach out to schedule.
No obligation. We'll assess your space and give you a real number.