RRT Subfloor Preparation & Assessment

Question 1

What is the maximum allowable moisture vapor emission rate (MVER) for a concrete subfloor before installing carpet with standard adhesive?

Accepted Answer

5 lbs per 1,000 sq ft per 24 hours

Answer

3 lbs per 1,000 sq ft per 24 hours

Answer

8 lbs per 1,000 sq ft per 24 hours

Answer

10 lbs per 1,000 sq ft per 24 hours

Question 2

When assessing a wood subfloor for carpet reinstallation, what is the maximum acceptable deflection under a concentrated 200-lb load?

Accepted Answer

L/360

Answer

L/180

Answer

L/240

Answer

L/480

Question 3

Which test method uses a calcium chloride dish sealed to a concrete slab to measure moisture emissions?

Accepted Answer

ASTM F1869

Answer

ASTM F2170

Answer

ASTM D4263

Answer

ASTM E1745

Question 4

A concrete subfloor has a pH reading of 10. What does this indicate for carpet installation?

Accepted Answer

The slab is highly alkaline and may affect adhesive bond

Answer

The slab is neutral and ready for installation

Answer

The slab is too acidic and must be treated

Answer

The slab pH is irrelevant to carpet installation

Question 5

What is the recommended flatness tolerance for a concrete subfloor prior to carpet installation?

Accepted Answer

3/16 inch in 10 feet

Answer

1/4 inch in 6 feet

Answer

1/8 inch in 6 feet

Answer

1/2 inch in 10 feet

Question 6

Which of the following is the correct procedure when a wood subfloor has protruding nail heads before carpet installation?

Accepted Answer

Set the nail heads below the surface with a nail set

Answer

Sand the entire subfloor smooth

Answer

Pull the nails and refill the holes

Answer

Leave them and use extra padding to cushion

Question 7

When evaluating a subfloor that shows cupping in wood planks, what is the primary cause of this condition?

Accepted Answer

Moisture imbalance between the top and bottom face of the plank

Answer

Excessive foot traffic over time

Answer

Low-quality lumber used during construction

Answer

Improper carpet padding beneath the boards