Subfloor Moisture Testing For Installations of Armstrong Flooring Products

Moisture Testing

Moisture testing is an essential part of determining the suitability of a concrete slab to receive a resilient floor covering. Moisture testing must be performed on all concrete slabs regardless of their age or grade level, including areas where resilient flooring has already been installed. Moisture testing should be conducted with the area or building at service conditions, i.e. fully enclosed, weather-tight and with the permanent HVAC in operation. In general, moisture testing should be conducted on concrete surfaces that exhibit the final prepared stage before the installation of the flooring material and before installation of smoothing or leveling compounds.

Armstrong Flooring recommends the following test methods:

Percent Relative Humidity (RH) in Concrete Slabs – Preferred Method
Testing for internal relative humidity of concrete slabs must be conducted in strict accordance with the latest edition of ASTM F 2170, “Standard Test Method for Determining Relative Humidity in Concrete Floor Slabs Using in situ Probes.”

Moisture Vapor Emission (MVER) Test
MVER tests must be conducted in accordance with the latest edition of ASTM F 1869, “Standard Test Method for Measuring Vapor Emission Rate of Concrete Subfloor Using Anhydrous Calcium Chloride.” When performing these tests, it is important to remove any curing agents or residues down to bare concrete. The calcium chloride tests are to be performed only on ordinary concrete floors and are not applicable on lightweight concrete, smoothing or leveling compounds, gypsum underlayments, or other fills.

All tests must meet the allowable moisture limits. Any area that exceeds the allowable moisture limit must be further dried to an acceptable level or treated with a moisture remediation system before flooring installation. Performance of any third-party moisture remediation rests with the manufacturer of that system, not with Armstrong Flooring. As a reminder, these tests cannot predict long-term moisture conditions of concrete slabs. They are only indicators of moisture conditions at the time the tests are conducted.

NOTE: On installations where both the Moisture Vapor Emission Rate and Percent Relative Humidity tests are conducted, results for both tests shall comply with the allowable limits listed in the below tables.

Following are Armstrong Flooring’s maximum allowable moisture limits and pH limits: 

ProductAdhesive% Internal
Relative
Humidity
MVER
Pounds Per
1,000 ft2 Per
24 Hours
pH
Vinyl Composition Tile (VCT)S-5259075 – 11
Vinyl Composition Tile (VCT)S-5159575 – 11
Vinyl Composition Tile (VCT)Flip Spray95N/A5 – 11
Vinyl Composition Tile (VCT)S-31999N/A5 – 12
Vinyl Composition Tile (VCT)S-1000100145 – 14
Safety Zone TileS-52590 75 – 11
Safety Zone TileS-5159575 – 11
Safety Zone TileFlip Spray95N/A5 – 11
Safety Zone TileS-1000100145 – 14
Static Dissipative TileS-2027535 – 9
Migrations/Striations BBTS-5259075 – 11
Migrations/Striations BBTS-1000100145 – 14
Coalesce, Duo, Exchange, Terra, Theorem
Natural Creations with Diamond
10 Technology LVT
Parallel USA LVT 12 & 20
S-99595 on grade or above;
90 below grade
N/A8.0-10.0 on or above grade;
9.0 below grade
Coalesce, Duo, Exchange, Terra, Theorem
Natural Creations with Diamond
10 Technology LVT
Parallel USA LVT 12 & 20
S-31999N/A5 – 12
Coalesce, Duo, Exchange, Terra, Theorem
Natural Creations with Diamond
10 Technology LVT
Parallel USA LVT 12 & 20
S-1000100145 – 14
AlternaS-29595 on grade or above;
90 below grade
N/A8 – 10
Fiberglass-Reinforced Sheet FlooringS-29595 on grade or above;
90 below grade
N/A8 – 10
Fiberglass-Reinforced Sheet FlooringS-29995N/A8 – 12
Integrated Stair TreadS-72690N/A8 – 10
ProductAdhesive% Internal
Relative
Humidity
MVER
Pounds Per
1,000 ft2 Per
24 Hours
pH

All tests must meet the allowable moisture limits. Any area that exceeds the allowable moisture limit must be further dried to an acceptable level or treated with a moisture remediation system before flooring installation. Performance of any third-party moisture remediation rests with the manufacturer of that system, not with Armstrong Flooring. As a reminder, these tests cannot predict long-term moisture conditions of concrete slabs. They are only indicators of moisture conditions at the time the tests are conducted. NOTE: On installations where both the Moisture Vapor Emission Rate and Percent Relative Humidity tests are conducted, results for both tests shall comply with the allowable limits listed in the above tables.

Updated on August 24, 2022