CFI Subfloor Assessment & Preparation 4

Question 1

Which condition in an existing vinyl composition tile (VCT) floor may indicate the presence of asbestos?

Accepted Answer

Tiles that are 9×9 inches and installed before 1980

Answer

9×9-inch VCT tiles and their adhesive installed before 1980 commonly contained asbestos and must be tested before disturbance.

Question 2

What is the recommended acclimation period and environment for hardwood flooring before installation?

Accepted Answer

3–5 days at 60–80°F with 30–50% RH matching occupied conditions

Answer

Hardwood must acclimate at living conditions (60–80°F, 30–50% RH) for 3–5 days so it reaches equilibrium moisture content before installation.

Question 3

When is it necessary to install a vapor retarder under a wood subfloor over a crawl space?

Accepted Answer

Whenever the crawl space is unconditioned or has exposed soil

Answer

Exposed soil in an unconditioned crawl space is a major moisture source; a polyethylene vapor retarder is required to protect the wood subfloor above.

Question 4

A plywood subfloor panel has face checking (surface cracks). What is the appropriate action before installing hardwood over it?

Accepted Answer

Fill the checks with floor patching compound and allow to cure

Answer

Surface checks must be filled and flattened so they don't telegraph through or create weak points in the finished floor.

Question 5

What is the primary reason for staggering end joints of subfloor panels by at least 4 feet?

Accepted Answer

To prevent a continuous joint line that creates a weak point or ridge

Answer

Staggering end joints distributes stress and prevents a continuous weak line that could crack finishes or create a noticeable ridge.

(CFI) Certified Flooring Installer Practice Test

(CFI) Certified Flooring Installer Practice Test

CFI Subfloor Assessment & Preparation 4