Moisture Testing & Environmental Conditions Flashcards
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Read the first 6 Moisture Testing & Environmental Conditions flashcards as text
Which ASTM standard test method is used to measure moisture vapor emission rate (MVER) from a concrete slab?
Answer: ASTM F1869
ASTM F1869 is the calcium chloride test method for measuring moisture vapor emission rate from concrete slabs prior to flooring installation.
What unit of measurement does the ASTM F1869 calcium chloride test express moisture vapor emission in?
Answer: Pounds per 1,000 sq ft per 24 hours
The calcium chloride test result is expressed in pounds of moisture vapor emitted per 1,000 square feet per 24 hours.
What maximum MVER do most flooring adhesive manufacturers specify for concrete slab installations?
Answer: 3 lbs per 1,000 sq ft/24 hrs
Most standard flooring adhesives are rated for substrates emitting no more than 3 lbs/1,000 sq ft/24 hrs; higher emissions require moisture-tolerant adhesives or a barrier system.
What does the ASTM F2170 test method measure in a concrete slab?
Answer: Relative humidity (RH) within the slab using an in-situ probe
ASTM F2170 measures internal relative humidity within the concrete slab by placing probes at a specified depth, reflecting the slab's true moisture condition.
At what depth within the concrete slab are F2170 RH probes typically installed?
Answer: 40% of slab depth for slabs drying from one side
For slabs drying from one side, ASTM F2170 specifies probe installation at 40% of the slab's total thickness to capture representative moisture levels.
What maximum relative humidity reading does ASTM F2170 allow for most standard adhesive-set flooring installations?
Answer: 75% RH
Most flooring manufacturers and the ASTM F2170 protocol specify a maximum of 75% RH in the slab for standard adhesive installations; exceeding this requires special systems.