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
Which of the following conditions on a metal stud-framed wall assembly is MOST critical to verify before EIFS installation?
Answer: Sheathing panel joint gap width
Sheathing panel joint gaps must not exceed manufacturer-specified tolerances because excessive gaps can cause stress concentrations leading to cracking in the EIFS finish.
When preparing a stucco substrate to receive EIFS, what condition requires complete removal rather than simple patching?
Answer: Delaminated or hollow-sounding stucco
Delaminated stucco has failed its bond to the substrate and cannot support EIFS; it must be removed and the area recoated properly before EIFS installation.
What is the recommended minimum drying time for new concrete before EIFS can be applied?
Answer: 28 days
New concrete must cure for a minimum of 28 days to achieve adequate strength and allow excess moisture to dissipate before EIFS adhesive application.
An EIFS inspector finds that OSB sheathing has been installed with the grade stamp facing outward. What is the correct action?
Answer: Reject it because the grade stamp side must face the framing
OSB must typically be installed with the grade stamp side facing the framing so the smoother, factory side faces outward to provide better adhesion for EIFS.
Which fastener pattern is critical to verify during sheathing inspection for an EIFS substrate?
Answer: Fasteners flush or slightly below the sheathing surface without breaking the facing
Fasteners must be flush or slightly countersunk without breaking the sheathing face to maintain substrate integrity and avoid creating stress points.
When inspecting a substrate for EIFS application, what does a 'hollow' sound when tapping indicate?
Answer: Delamination or voids behind the surface
A hollow sound when tapping indicates delamination or voids, meaning the substrate layer has separated from the backing and cannot support EIFS application.
What is the maximum out-of-plane tolerance (flatness) typically required for an EIFS substrate?
Answer: 1/4 inch in 10 feet
EIFS substrates must be within 1/4 inch in 10 feet of plane to ensure uniform adhesive coverage and prevent stress concentrations from bridging irregular surfaces.