CFI Adhesive & Underlayment Selection 5

Question 1

Which standard governs moisture testing of concrete substrates before flooring installation in the US?

Accepted Answer

ASTM F1869

Answer

ASTM F1869 is the standard test method for measuring moisture vapor emission rate (MVER) from concrete using anhydrous calcium chloride, widely used before flooring installation.

Question 2

When must a secondary moisture barrier be installed under underlayment in a crawl space application?

Accepted Answer

Always, as part of proper crawl space moisture management regardless of conditions

Answer

A ground cover moisture barrier should always be installed in crawl spaces as standard practice because soil continuously releases moisture vapor that can migrate upward into floor systems.

Question 3

An installer is bonding sheet vinyl to a wood subfloor using a full-spread adhesive. What is the correct method to ensure proper bond?

Accepted Answer

Use a 100-lb floor roller to ensure full contact after positioning

Answer

A 100-lb floor roller ensures full contact between the vinyl and adhesive, eliminating air pockets and achieving consistent bond across the entire surface.

Question 4

Which underlayment product is most appropriate to use between an old ceramic tile subfloor and a new porcelain tile installation?

Accepted Answer

Uncoupling membrane

Answer

An uncoupling membrane allows the new tile layer to move independently from the old substrate, preventing crack transmission from the old grout joints or any minor substrate movement.

Question 5

What is the primary reason to back-roll adhesive after troweling when installing resilient flooring?

Accepted Answer

To flatten trowel ridges and achieve a more uniform adhesive film thickness

Answer

Back-rolling with a short-nap roller collapses trowel ridges to create a uniform film, preventing ridge telegraphing through thin resilient flooring materials.

(CFI) Certified Flooring Installer Practice Test

(CFI) Certified Flooring Installer Practice Test

CFI Adhesive & Underlayment Selection 5