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CTI Substrate Preparation & Waterproofing Flashcards

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

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  1. What is the maximum allowable floor deflection for a substrate intended for tile installation per TCNA guidelines?

    Answer: L/360

    TCNA specifies the substrate must not deflect more than L/360 of the span under live load for tile installations.

  2. Which moisture test measures vapor emission rate in pounds per 1,000 sq ft per 24 hours on a concrete slab?

    Answer: Calcium chloride test

    The calcium chloride test (ASTM F1869) measures vapor emission rate in pounds per 1,000 sq ft per 24 hours.

  3. What is the maximum acceptable moisture content for a wood subfloor before tile installation?

    Answer: 19%

    Wood subfloors should have a moisture content of 19% or less to prevent warping or bond failure beneath tile.

  4. Which type of waterproofing membrane is applied as a liquid and cures to form a seamless, continuous layer?

    Answer: Bonded (liquid-applied) waterproofing membrane

    Bonded liquid-applied waterproofing membranes are brushed or rolled on and cure to form a seamless, continuous barrier with no seams.

  5. What is the primary purpose of a cleavage membrane in a mortar bed installation?

    Answer: Allow the mortar bed to float independently of the substrate

    A cleavage membrane (such as 15 lb felt or 4-mil polyethylene) separates the mortar bed from the substrate, allowing independent movement.

  6. When inspecting a shower pan liner installation, how high must the liner extend above the rough shower curb?

    Answer: 2 inches

    The liner must extend at least 2 inches above the top of the rough curb to ensure proper waterproofing containment.

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Sources & references

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  1. ceramictilefoundation.org — Eligibility, fees, registration, test delivery, exam format, late registration, passing score, retake policy, score release, time limit · verified Oct 2026