RRT Subfloor Preparation & Assessment 3

Question 1

A radiant heat subfloor system must be at what temperature before a carpet and pad system is installed over it?

Accepted Answer

Running at maximum operating temperature for 48 hours then cooled to room temperature

Answer

Radiant heat systems should be run at maximum temperature for 48 hours to pre-condition the slab, then cooled to room temperature before carpet installation to allow proper adhesion.

Question 2

What type of fastener is preferred when securing tackless strip to a concrete subfloor?

Accepted Answer

Powder-actuated fasteners

Answer

Powder-actuated fasteners (Ramset-type tools) are the preferred and most efficient method for securing tackless strip to concrete subfloors.

Question 3

When assessing an OSB subfloor for carpet reinstallation, what is the most critical defect to look for?

Accepted Answer

Panel edge swelling or delamination from moisture exposure

Answer

OSB is highly susceptible to edge swelling and delamination when exposed to moisture, which creates an uneven surface that telegraphs through carpet.

Question 4

How far should a patching compound cure before carpet installation proceeds over a concrete subfloor repair?

Accepted Answer

After the full cure time specified by the manufacturer, typically 24–48 hours

Answer

Flooring patching compounds must reach full cure per manufacturer specifications (typically 24–48 hours) to achieve the required hardness and bond strength.

Question 5

What is the minimum recommended space between plywood underlayment panels during installation to allow for expansion?

Accepted Answer

1/32 inch

Answer

A 1/32-inch gap between underlayment panels provides room for slight expansion while preventing raised seams that telegraph through finished flooring.

RRT - Carpet Repair and Reinstallation Technician Practice Test

RRT - Carpet Repair and Reinstallation Technician Practice Test

RRT Subfloor Preparation & Assessment 3