Practice Test Geeks(EIFS) Certified Exterior Insulation and Finish Systems Inspector Practice Test
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Substrate Preparation & Surface Compatibility Flashcards

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

Read the first 7 Substrate Preparation & Surface Compatibility flashcards as text

  1. A contractor is preparing to install EIFS over an existing EIFS system. What is the FIRST step an inspector should verify was completed?

    Answer: Assessment of existing EIFS condition and bond strength

    Before any overcoat EIFS installation, the existing system must be thoroughly evaluated for bond strength and condition to determine if it can support additional layers.

  2. Which chemical treatment is typically applied to concrete block to improve EIFS adhesive bonding?

    Answer: Muriatic acid wash followed by neutralizing rinse

    Muriatic acid washing opens the pores of concrete masonry and removes laitance, improving adhesive bonding; the acid must then be neutralized and the surface thoroughly rinsed.

  3. When evaluating a substrate for EIFS, what does the term 'laitance' refer to?

    Answer: A weak surface layer of concrete caused by excess water migration during curing

    Laitance is a weak, powdery layer of cement and fine aggregates on concrete surfaces that forms when excess water rises during curing and must be removed before EIFS application.

  4. What is the purpose of back-wrapping mesh around penetrations and openings in an EIFS substrate?

    Answer: To reinforce the substrate edges and prevent moisture intrusion at terminations

    Back-wrapping mesh at openings and terminations reinforces vulnerable edges and creates a waterproof termination to prevent moisture from entering behind the EIFS system.

  5. What substrate preparation is required when EIFS is to be installed over existing glazed brick or tile?

    Answer: Mechanical scarification or application of a manufacturer-approved bonding agent

    Glazed surfaces are too smooth for direct adhesion; mechanical scarification or a compatible bonding agent is required to create sufficient surface profile for EIFS adhesive.

  6. At what ambient temperature should substrate preparation and EIFS application typically NOT proceed without special cold-weather measures?

    Answer: Below 40°F (4°C)

    EIFS application should not proceed when ambient or substrate temperature is below 40°F (4°C) without special cold-weather protection, as adhesives and finishes will not cure properly.

  7. Which of the following substrate configurations is ACCEPTABLE for a barrier EIFS installation?

    Answer: Exterior gypsum sheathing with all joints and penetrations properly sealed

    Exterior gypsum sheathing with properly sealed joints and penetrations provides a continuous moisture barrier surface suitable for barrier EIFS systems.