CFI Moisture Testing & Environmental Conditions

Question 1

Which ASTM standard test method is used to measure moisture vapor emission rate (MVER) from a concrete slab?

Accepted Answer

ASTM F1869

Answer

ASTM F1869 is the calcium chloride test method for measuring moisture vapor emission rate from concrete slabs prior to flooring installation.

Question 2

What unit of measurement does the ASTM F1869 calcium chloride test express moisture vapor emission in?

Accepted Answer

Pounds per 1,000 sq ft per 24 hours

Answer

The calcium chloride test result is expressed in pounds of moisture vapor emitted per 1,000 square feet per 24 hours.

Question 3

What maximum MVER do most flooring adhesive manufacturers specify for concrete slab installations?

Accepted Answer

3 lbs per 1,000 sq ft/24 hrs

Answer

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.

Question 4

What does the ASTM F2170 test method measure in a concrete slab?

Accepted Answer

Relative humidity (RH) within the slab using an in-situ probe

Answer

ASTM F2170 measures internal relative humidity within the concrete slab by placing probes at a specified depth, reflecting the slab's true moisture condition.

Question 5

At what depth within the concrete slab are F2170 RH probes typically installed?

Accepted Answer

40% of slab depth for slabs drying from one side

Answer

For slabs drying from one side, ASTM F2170 specifies probe installation at 40% of the slab's total thickness to capture representative moisture levels.

CFI - Flooring Installation and Maintenance Certification Practice Test

CFI - Flooring Installation and Maintenance Certification Practice Test

CFI Moisture Testing & Environmental Conditions