CFI Adhesives, Fasteners & Transition Systems 1 — Questions and Answers
Question 1: What type of trowel notch is most commonly specified for applying full-spread adhesive for broadloom carpet installation?
- 1/16 inch x 1/16 inch V-notch (Correct answer)
- 3/16 inch x 5/32 inch U-notch
- 1/4 inch x 1/4 inch square-notch
- 1/8 inch x 1/8 inch square-notch
Correct answer: 1/16 inch x 1/16 inch V-notch
A 1/16 x 1/16 V-notch trowel provides the thin, uniform adhesive film required for glue-down broadloom carpet installations.
Question 2: What is 'open time' in the context of flooring adhesives?
- The period after application during which the adhesive can accept the flooring material (Correct answer)
- The time needed to cure after the floor is laid
- The working temperature range
- The manufacturer's recommended shelf life
Correct answer: The period after application during which the adhesive can accept the flooring material
Open time is the window between adhesive application and the point at which it can no longer bond effectively to the flooring material.
Question 3: Which type of fastener is used to nail solid hardwood strip flooring to a wood subfloor with a pneumatic nailer?
- Cleat nail or staple (Correct answer)
- Ring-shank screw
- Smooth-shank brad nail
- Concrete screw
Correct answer: Cleat nail or staple
Pneumatic flooring nailers drive cleat nails or staples through the tongue of hardwood strip flooring at the correct angle into the subfloor.
Question 4: What is the purpose of a 'reducer' transition strip in flooring installations?
- To transition between two floor surfaces of different heights (Correct answer)
- To cover expansion gaps only
- To join two surfaces of identical height
- To provide a threshold between interior and exterior spaces only
Correct answer: To transition between two floor surfaces of different heights
A reducer transitions between two floor surfaces with different thicknesses, creating a sloped ramp that is both functional and safe.
Question 5: What is the purpose of applying adhesive at a 'wet-set' for large-format tile installation?
- To ensure full back coverage while the mortar is fresh and pliable (Correct answer)
- To speed up cure time
- To prevent lippage only
- To allow tiles to slide after setting
Correct answer: To ensure full back coverage while the mortar is fresh and pliable
Wet-setting means embedding the tile immediately into fresh mortar to achieve maximum back coverage, which is critical for large-format tiles.
Question 6: Which adhesive type is most appropriate for installing LVT (luxury vinyl tile) in a high-moisture area like a commercial kitchen?
- Pressure-sensitive or hard-set epoxy adhesive rated for wet areas (Correct answer)
- Standard latex carpet adhesive
- Water-based wood flooring adhesive
- Hot-melt adhesive
Correct answer: Pressure-sensitive or hard-set epoxy adhesive rated for wet areas
Wet-area installations require adhesives specifically formulated to resist moisture and maintain bond integrity, such as epoxy or pressure-sensitive adhesives rated for high-humidity environments.
CFI Adhesives, Fasteners & Transition Systems 1
What type of trowel notch is most commonly specified for applying full-spread adhesive for broadloom carpet installation?