CFI Surface Preparation & Safety Procedures 2

Question 1

When using a floor grinder to prepare a concrete subfloor, which PPE is most critical to prevent long-term health damage?

Accepted Answer

N95 respirator or higher

Answer

Concrete dust contains silica, which causes silicosis; an N95 or P100 respirator is essential when grinding.

Question 2

A moisture vapor emission rate (MVER) test on a concrete slab reads 8 lbs/1000 sq ft/24 hrs. What is the appropriate next step before installing adhesive-set flooring?

Accepted Answer

Apply a moisture mitigation system

Answer

Most adhesive manufacturers require MVER ≤ 3–5 lbs; 8 lbs exceeds limits and requires a moisture mitigation coating.

Question 3

Which tool is used to check that a concrete subfloor meets the flatness requirement of 3/16" over a 10-foot span?

Accepted Answer

10-foot straightedge

Answer

A 10-foot straightedge is the standard tool to verify the 3/16" flatness tolerance across a concrete slab.

Question 4

What is the primary hazard of using a propane-powered buffer in an enclosed space without ventilation?

Accepted Answer

Carbon monoxide poisoning

Answer

Propane combustion produces carbon monoxide, which is odorless and deadly in poorly ventilated spaces.

Question 5

Before shot-blasting a concrete subfloor, the installer should first:

Accepted Answer

Remove all loose debris and oil contamination

Answer

Oil contamination must be removed before shot-blasting because it can embed into the surface and interfere with adhesion.

(CFI) Certified Flooring Installer Practice Test

(CFI) Certified Flooring Installer Practice Test

CFI Surface Preparation & Safety Procedures 2