CFI Moisture Mitigation Systems 3

Question 1

When using ASTM F2170 in-situ probes, where in the slab depth should the hole be drilled for slabs drying from one side only?

Accepted Answer

40% of slab depth

Answer

For slabs drying from one side only (typical in-service condition), ASTM F2170 requires the probe hole to be drilled to 40% of the slab depth.

Question 2

A flooring contractor finds a MVER of 12 lbs/1,000 sq ft/24 hrs. Which is the most appropriate next step?

Accepted Answer

Install a moisture mitigation system rated for the measured MVER

Answer

A MVER of 12 lbs exceeds the typical 3–5 lb threshold for most adhesives, requiring an approved moisture mitigation system rated to handle the actual measured level.

Question 3

What is the function of sand broadcast into a wet moisture mitigation coating?

Accepted Answer

To create a mechanical bond profile for the flooring adhesive or underlayment

Answer

Broadcasting sand into the wet coating creates a textured surface profile that allows flooring adhesives or self-leveling underlayment to mechanically bond to the mitigation layer.

Question 4

Which type of flooring is MOST sensitive to moisture vapor and most likely to require mitigation even at moderate RH levels?

Accepted Answer

Solid hardwood flooring

Answer

Solid hardwood flooring is highly hygroscopic and will cup, warp, or buckle with exposure to elevated moisture vapor, making it extremely sensitive to subfloor moisture conditions.

Question 5

How long must an ASTM F1869 calcium chloride test kit typically remain sealed on the concrete before reading?

Accepted Answer

60–72 hours

Answer

ASTM F1869 requires the calcium chloride dish to remain sealed under the dome for 60–72 hours before weighing to determine moisture vapor emission rate.

(CFI) Certified Flooring Installer Practice Test

(CFI) Certified Flooring Installer Practice Test

CFI Moisture Mitigation Systems 3