CFI CFI Hardwood & Engineered Wood Flooring 1 — Questions and Answers
Question 1: What is the minimum recommended acclimation period for solid hardwood flooring before installation in most US climate conditions?
- 24 hours
- 3–5 days (Correct answer)
- 1 hour
- 10 days
Correct answer: 3–5 days
Solid hardwood should acclimate in the installation environment for at least 3–5 days to minimize expansion or contraction after installation.
Question 2: Which nail type is the industry standard for blind-nailing solid 3/4-inch hardwood flooring?
- 18-gauge brad nail
- 16-gauge finish nail
- 15.5-gauge cleat nail (Correct answer)
- 16-gauge staple
Correct answer: 15.5-gauge cleat nail
15.5-gauge cleat nails are the CFI-recommended fastener for blind-nailing 3/4-inch solid hardwood because they hold firmly without splitting the tongue.
Question 3: What expansion gap is required around the perimeter when installing solid hardwood flooring?
- 1/16 inch
- 1/4 inch
- 3/4 inch (Correct answer)
- 1 inch
Correct answer: 3/4 inch
A 3/4-inch expansion gap around the perimeter allows solid hardwood to expand and contract with seasonal humidity changes without buckling.
Question 4: Engineered wood flooring can typically be installed at or below grade because its cross-ply construction:
- Is waterproof
- Reduces expansion and contraction from moisture (Correct answer)
- Eliminates the need for acclimation
- Requires no subfloor preparation
Correct answer: Reduces expansion and contraction from moisture
The cross-ply construction of engineered wood limits dimensional movement caused by moisture, making it suitable for below-grade or on-grade installations.
Question 5: When face-nailing the first row of solid hardwood flooring, nails should be placed:
- Through the groove side only
- 1 inch from the wall edge through the face (Correct answer)
- At every other board only
- Only at the ends of each board
Correct answer: 1 inch from the wall edge through the face
The first row is face-nailed approximately 1 inch from the wall edge so the nail heads will be hidden by the base molding.
Question 6: What minimum wood moisture content difference between the hardwood flooring and the subfloor does CFI recommend investigating before installation?
- 1%
- 4% (Correct answer)
- 10%
- 15%
Correct answer: 4%
CFI guidelines indicate that a moisture content difference greater than 4% between the hardwood and subfloor warrants investigation and corrective action before installation.
CFI CFI Hardwood & Engineered Wood Flooring 1
What is the minimum recommended acclimation period for solid hardwood flooring before installation in most US climate conditions?