CFI CFI Wood & Hardwood Flooring 2

Question 1

What is the Janka hardness rating primarily used for in hardwood flooring selection?

Accepted Answer

Indicating the force needed to embed a steel ball halfway into the wood

Answer

The Janka hardness test measures the resistance of wood to denting and wear by recording the force needed to embed a 0.444-inch steel ball halfway into the sample.

Question 2

Which of the following hardwood species has the HIGHEST Janka hardness rating among commonly used US flooring species?

Accepted Answer

Brazilian Cherry (Jatoba)

Answer

Brazilian Cherry (Jatoba) has a Janka rating of approximately 2,350 lbf, making it significantly harder than domestic species like Red Oak (1,290 lbf).

Question 3

When installing hardwood flooring over a concrete slab, which installation method is generally NOT recommended?

Accepted Answer

Nail-down solid hardwood directly to concrete

Answer

Nail-down solid hardwood directly to concrete is not recommended because concrete does not accept nails and the slab can retain moisture that damages solid wood.

Question 4

The term 'cupping' in hardwood flooring refers to:

Accepted Answer

Plank edges that are higher than the center, creating a concave surface

Answer

Cupping occurs when the edges of a hardwood plank are higher than the center, typically caused by excess moisture on the underside of the plank.

Question 5

What is the purpose of a moisture barrier or vapor retarder installed beneath a hardwood floor?

Accepted Answer

To slow the transfer of moisture vapor from the subfloor or slab into the hardwood

Answer

A moisture barrier slows vapor transmission from the subfloor or slab, protecting the hardwood from moisture-induced swelling, cupping, or mold growth.

(CFI) Certified Flooring Installer Practice Test

(CFI) Certified Flooring Installer Practice Test

CFI CFI Wood & Hardwood Flooring 2