CFI Flooring Materials & Installation Techniques 2 — Questions and Answers
Question 1: What is the minimum recommended acclimation time for solid hardwood flooring in most residential installations?
- 24 hours
- 3–5 days (Correct answer)
- 1 hour
- 2 weeks
Correct answer: 3–5 days
Solid hardwood should acclimate for at least 3–5 days in the installation environment to equalize moisture content.
Question 2: Which underlayment type provides the best sound reduction for floating LVP installations over concrete?
- Kraft paper
- Cork or foam composite with IIC rating (Correct answer)
- Rosin paper
- Felt paper
Correct answer: Cork or foam composite with IIC rating
Cork or foam composite underlayments with a high IIC (Impact Insulation Class) rating provide the best sound attenuation for floating LVP over concrete.
Question 3: When installing ceramic tile using the thin-set method, the back-buttering technique is used to:
- Speed up the curing process
- Ensure full coverage on large-format or porous tiles (Correct answer)
- Reduce lippage between tiles
- Prevent grout absorption
Correct answer: Ensure full coverage on large-format or porous tiles
Back-buttering applies thin-set directly to the tile back to achieve the required 95% mortar coverage for wet areas or large-format tiles.
Question 4: The maximum allowable moisture vapor emission rate (MVER) for most resilient flooring adhesive installations over concrete is:
- 10 lbs/1,000 sq ft/24 hrs
- 3 lbs/1,000 sq ft/24 hrs (Correct answer)
- 8 lbs/1,000 sq ft/24 hrs
- 1 lb/1,000 sq ft/24 hrs
Correct answer: 3 lbs/1,000 sq ft/24 hrs
Most resilient flooring adhesive manufacturers specify a maximum MVER of 3 lbs per 1,000 sq ft per 24 hours as measured by the calcium chloride test.
Question 5: Which type of trowel notch produces the highest ridges for maximum adhesive coverage with sheet vinyl?
- V-notch
- U-notch
- Square-notch (Correct answer)
- Fine-tooth notch
Correct answer: Square-notch
Square-notch trowels produce the fullest, highest ridges, delivering maximum adhesive coverage for sheet vinyl and resilient tile.
Question 6: What does 'telegraphing' mean in the context of resilient flooring installation?
- Adhesive bleeding through seams
- Subfloor imperfections showing through the finished surface (Correct answer)
- Grout haze on tile surfaces
- Color variation between planks
Correct answer: Subfloor imperfections showing through the finished surface
Telegraphing occurs when subfloor irregularities, fastener heads, or old adhesive ridges transfer their pattern through the resilient floor surface.
Question 7: When installing bamboo flooring, which installation method is NOT recommended over a radiant heat system?
- Glue-down
- Nail-down over sleepers
- Floating (Correct answer)
- Direct glue to subfloor
Correct answer: Floating
Floating bamboo over radiant heat is not recommended because the floating gap allows heat to build unevenly, causing excessive expansion and movement.
CFI Flooring Materials & Installation Techniques 2
What is the minimum recommended acclimation time for solid hardwood flooring in most residential installations?