CFI Adhesive & Underlayment Selection 2

Question 1

Which adhesive type is most appropriate for installing vinyl composition tile (VCT) over a porous concrete subfloor?

Accepted Answer

Pressure-sensitive acrylic adhesive

Answer

Pressure-sensitive acrylic adhesives are the standard choice for VCT over porous concrete, providing proper bond without releasing VOCs associated with solvent-based products.

Question 2

When installing underlayment in a bathroom, which property is most critical for selection?

Accepted Answer

Moisture resistance

Answer

Moisture resistance is the most critical property for bathroom underlayment because high humidity and potential water exposure can degrade non-resistant materials and damage the flooring.

Question 3

A flooring installer is working in a room with radiant heat. Which underlayment should be avoided?

Accepted Answer

Thick foam underlayment over 3mm

Answer

Thick foam underlayment (over 3mm) acts as insulation and reduces heat transfer efficiency from radiant heating systems, potentially causing system malfunction or flooring damage.

Question 4

What is the primary function of a crack isolation membrane used under tile installations?

Accepted Answer

To prevent substrate cracks from telegraphing through to the tile surface

Answer

Crack isolation membranes are designed to absorb movement from substrate cracks so those cracks do not transfer stress up through the tile and grout.

Question 5

Which adhesive characteristic is described by 'open time'?

Accepted Answer

The period after spreading during which the adhesive remains workable and can bond materials

Answer

Open time refers to the window after the adhesive is troweled onto the substrate during which it can still form an effective bond when flooring material is pressed into it.

(CFI) Certified Flooring Installer Practice Test

(CFI) Certified Flooring Installer Practice Test

CFI Adhesive & Underlayment Selection 2