Moisture Mitigation & Testing — RH (In-Situ) and Calcium Chloride
FloorMasters Group provides professional slab moisture assessment and mitigation planning. We use
ASTM F2170 in-situ RH testing and ASTM F1869 Calcium Chloride (MVER) testing.
Tests can be performed individually or together for a fuller picture before flooring or coatings.
Serving Greater Victoria & Vancouver Island.
RH (In-Situ) — ASTM F2170
We drill and place sensors at 40% depth (for drying from one side) to measure internal relative humidity.
RH correlates strongly with many adhesive and coating system limits.
- Core holes drilled, sleeves installed, sensors equilibrate (typically ~24 hours).
- Readings recorded and logged with temperature and location.
- Recommended where RH limits govern product selection.
Calcium Chloride — ASTM F1869
We place pre-weighed CaCl dishes under sealed domes to measure moisture vapor emission rate (MVER)
in lbs/1000 ft²/24h.
- Surface prepped, domes sealed; exposure period typically 60–72 hours.
- Weight gain measured to calculate MVER.
- Useful for legacy specs and emission-based limits.
When to Use Both Together
Combining RH (internal condition) + MVER (surface emission) gives a more complete moisture profile,
reducing risk before installing LVP, carpet tile, coatings, or self-levelers.
- Conflicting readings or borderline specs
- Mixed systems (e.g., patch + epoxy + urethane)
- Critical schedules or sensitive finishes
Our Workflow
- Site review & layout: Grid placement based on square footage and obstacles.
- Preparation: Clean/abrade surface as required; mark test locations.
- Testing: Drill/core for RH sleeves; place RH sensors and/or CaCl domes per method.
- Equilibration/Exposure: RH ~24 hours; CaCl typically 60–72 hours.
- Read & document: Capture readings, temperature, photos, and a simple plan view.
- Report & recommendations: If above limits, we’ll propose mitigation (e.g., epoxy vapor barrier, primers, or extended dry time).
Pricing & Test Count
$150.00 per hole/test. Minimum three (3) tests on the first 1,000 ft², then one (1) additional test per each additional 1,000 ft² (rounded up).
| Area (ft²) | Tests Required | Estimated Total |
|---|---|---|
| 1,000 | 3 | $450 |
| 2,000 | 4 | $600 |
| 3,500 | 5 | $750 |
| 5,200 | 7 | $1,050 |
Instant Estimator
Tests: —
Estimate: —
Rule: 3 tests for the first 1,000 ft², then +1 test per additional 1,000 ft² (rounded up). $150 per test.
Notes: Pricing is for testing only. Travel, after-hours access, patching, and mitigation materials/labor are quoted separately.
Mitigation Options (Quoted as Needed)
- Moisture vapor barrier epoxy systems
- Primer systems compatible with self-levelers/adhesives
- Drying/conditioning plans and re-testing
The test results and recommendations reflect the conditions measured at the time of testing only.
Moisture levels can change due to weather, HVAC operation, building enclosure, or other factors.
No warranty is made or implied regarding future conditions. If site conditions change, re-testing is recommended.