Exterior Insulation & Finish Systems Fundamentals 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 Exterior Insulation & Finish Systems Fundamentals flashcards as text
Which component of an EIFS assembly serves as the primary drainage plane when a drainage-type system is installed?
Answer: The drainage mat or mesh behind the insulation board
In drainage-type EIFS, a drainage mat or textured drainage plane is installed between the insulation board and the substrate to allow moisture to exit the wall cavity.
What is the minimum required embedment of the reinforcing mesh in the base coat according to standard EIFS specifications?
Answer: The mesh must be fully embedded with no dry spots visible
Standard EIFS specifications require the fiberglass reinforcing mesh to be fully embedded in the base coat with no dry or exposed mesh visible.
An EIFS inspector observes a horizontal band of dark staining directly above a window opening. What is the most likely cause?
Answer: Inadequate flashing or sealant at the window head allowing water infiltration
Dark staining above window heads is a classic sign of water infiltration resulting from inadequate or failed flashing and sealant at the window head condition.
Which EPS insulation board characteristic is most critical for long-term EIFS performance?
Answer: Dimensional stability and compressive strength
Dimensional stability and adequate compressive strength ensure the EPS board does not shrink, warp, or crush under load, which would compromise the entire EIFS assembly.
What is the purpose of a control joint in an EIFS installation?
Answer: To accommodate differential movement and prevent uncontrolled cracking
Control joints are designed to accommodate differential thermal, moisture, and structural movement in the EIFS, directing any cracking to a planned and sealed location.
At what minimum angle from horizontal should EIFS sills or projections be sloped to promote water shedding?
Answer: 1:12 minimum, typically 3:12 preferred
EIFS guidelines require projecting elements such as sills and trim bands to slope at a minimum of 1:12, with steeper slopes preferred to ensure positive drainage.
When inspecting an existing EIFS installation, what does a 'hollow' sound when tapping the surface most likely indicate?
Answer: Delamination or loss of adhesion between layers
A hollow or drum-like sound when tapping EIFS typically indicates delamination, debonding, or voids between the insulation board and the substrate or between system layers.