WLFI Adhesive Selection & Application 2

Question 1

When installing engineered wood flooring over a radiant heat subfloor, which adhesive property is most critical?

Accepted Answer

Flexibility and heat resistance

Answer

Adhesives used over radiant heat must remain flexible and withstand elevated temperatures without losing bond strength.

Question 2

A moisture vapor emission rate (MVER) of 8 lbs/1,000 sq ft/24 hrs is measured on a concrete slab. What is the correct action before adhesive application?

Accepted Answer

Install a vapor retarder membrane first

Answer

An MVER of 8 lbs exceeds the threshold for most adhesives, requiring a vapor retarder membrane before bonding.

Question 3

Which trowel notch size produces a heavier adhesive deposit suitable for filling minor subfloor irregularities?

Accepted Answer

Square-notch 1/4"

Answer

A 1/4" square-notch trowel lays down more adhesive, helping fill minor surface voids in the subfloor.

Question 4

What is the primary reason an inspector checks for adhesive bleed-through at flooring joints?

Accepted Answer

It causes joint staining and prevents proper expansion

Answer

Adhesive bleed-through into joints stains the finish surface and fills expansion gaps, which can cause buckling.

Question 5

Which condition would cause a pressure-sensitive adhesive to fail prematurely when bonding resilient laminate flooring?

Accepted Answer

Substrate surface contamination with dust or oil

Answer

Dust, oil, or contaminants on the substrate prevent pressure-sensitive adhesives from forming a proper bond.

(WLFI) Wood and Laminate Flooring Inspector Practice Test

(WLFI) Wood and Laminate Flooring Inspector Practice Test

WLFI Adhesive Selection & Application 2