CFI Subfloor Preparation & Assessment

Question 1

What is the maximum allowable floor flatness tolerance for most resilient flooring installations over a wood subfloor?

Accepted Answer

3/16 inch in 10 feet

Answer

1/4 inch in 6 feet

Answer

1/8 inch in 3 feet

Answer

1/2 inch in 10 feet

Question 2

What minimum thickness of plywood subfloor is typically required beneath hardwood strip flooring?

Accepted Answer

3/4 inch

Answer

1/2 inch

Answer

5/8 inch

Answer

1 inch

Question 3

Which tool is used to detect high spots and low spots when assessing subfloor flatness?

Accepted Answer

Straightedge or flat bar

Answer

Moisture meter

Answer

Chalk line only

Answer

Laser level only

Question 4

What must be done to a concrete subfloor before installing glue-down LVP if the surface has a release agent residue?

Accepted Answer

Mechanically grind or scarify the surface

Answer

Apply a bonding primer only

Answer

Wet mop with a degreaser and install immediately

Answer

Sand with 60-grit paper

Question 5

What is the primary purpose of a self-leveling underlayment (SLU) on a concrete subfloor?

Accepted Answer

To fill low spots and achieve the required flatness tolerance

Answer

To add a moisture barrier

Answer

To increase subfloor thickness

Answer

To reduce noise transmission

Question 6

Before installing flooring over a radiant heat subfloor, what must the installer verify first?

Accepted Answer

That the system has been run through a heating cycle and the surface temperature is within acceptable limits

Answer

That the thermostat is set to maximum

Answer

That all pipes are copper

Answer

That the underlayment is foam