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Subfloor Preparation & Assessment Flashcards

7 cards from real RRT practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

Read the first 7 Subfloor Preparation & Assessment flashcards as text

  1. What is the maximum allowable moisture vapor emission rate (MVER) for a concrete subfloor before installing carpet with standard adhesive?

    Answer: 5 lbs per 1,000 sq ft per 24 hours

    Industry standards (ASTM F1869) generally set 5 lbs/1,000 sq ft/24 hours as the maximum MVER for adhesive carpet installations on concrete.

  2. When assessing a wood subfloor for carpet reinstallation, what is the maximum acceptable deflection under a concentrated 200-lb load?

    Answer: L/360

    L/360 is the standard deflection limit for subfloors receiving hard or resilient flooring; carpet installations follow the same structural guideline.

  3. Which test method uses a calcium chloride dish sealed to a concrete slab to measure moisture emissions?

    Answer: ASTM F1869

    ASTM F1869 is the Standard Test Method for Measuring Moisture Vapor Emission Rate of Concrete Subfloor Using Anhydrous Calcium Chloride.

  4. A concrete subfloor has a pH reading of 10. What does this indicate for carpet installation?

    Answer: The slab is highly alkaline and may affect adhesive bond

    A pH above 9 indicates high alkalinity, which can break down adhesives and adhesive bonds, requiring mitigation before installation.

  5. What is the recommended flatness tolerance for a concrete subfloor prior to carpet installation?

    Answer: 3/16 inch in 10 feet

    CRI (Carpet and Rug Institute) and most manufacturers specify no more than 3/16 inch variation in 10 feet for subfloor flatness.

  6. Which of the following is the correct procedure when a wood subfloor has protruding nail heads before carpet installation?

    Answer: Set the nail heads below the surface with a nail set

    Protruding nail heads must be set below the surface so they do not telegraph through the carpet or damage it over time.

  7. When evaluating a subfloor that shows cupping in wood planks, what is the primary cause of this condition?

    Answer: Moisture imbalance between the top and bottom face of the plank

    Cupping occurs when the bottom face of a wood plank absorbs more moisture than the top face, causing the edges to rise above the center.