EIFS Substrate Preparation & Surface Compatibility 2

Question 1

Which of the following conditions on a metal stud-framed wall assembly is MOST critical to verify before EIFS installation?

Accepted Answer

Sheathing panel joint gap width

Answer

Sheathing panel joint gaps must not exceed manufacturer-specified tolerances because excessive gaps can cause stress concentrations leading to cracking in the EIFS finish.

Question 2

When preparing a stucco substrate to receive EIFS, what condition requires complete removal rather than simple patching?

Accepted Answer

Delaminated or hollow-sounding stucco

Answer

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.

Question 3

What is the recommended minimum drying time for new concrete before EIFS can be applied?

Accepted Answer

28 days

Answer

New concrete must cure for a minimum of 28 days to achieve adequate strength and allow excess moisture to dissipate before EIFS adhesive application.

Question 4

An EIFS inspector finds that OSB sheathing has been installed with the grade stamp facing outward. What is the correct action?

Accepted Answer

Reject it because the grade stamp side must face the framing

Answer

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.

Question 5

Which fastener pattern is critical to verify during sheathing inspection for an EIFS substrate?

Accepted Answer

Fasteners flush or slightly below the sheathing surface without breaking the facing

Answer

Fasteners must be flush or slightly countersunk without breaking the sheathing face to maintain substrate integrity and avoid creating stress points.

(EIFS) Certified Exterior Insulation and Finish Systems Inspector Practice Test

(EIFS) Certified Exterior Insulation and Finish Systems Inspector Practice Test

EIFS Substrate Preparation & Surface Compatibility 2