EIFS Substrate Preparation & Surface Compatibility

Question 1

What is the maximum allowable moisture content of a wood sheathing substrate before EIFS application, according to industry standards?

Accepted Answer

19%

Answer

Wood sheathing must have a moisture content of 19% or less before EIFS installation to prevent adhesion failure and moisture-related damage.

Question 2

Which of the following substrate defects MUST be corrected before applying EIFS adhesive?

Accepted Answer

Efflorescence on concrete masonry

Answer

Efflorescence indicates ongoing moisture migration and must be removed and the source corrected before EIFS application to ensure proper adhesion.

Question 3

When inspecting a concrete masonry unit (CMU) substrate for EIFS compatibility, what is the primary concern regarding form release agents?

Accepted Answer

They can prevent proper bonding of EIFS adhesive

Answer

Form release agents leave a chemical residue on concrete surfaces that inhibits adhesion of EIFS components and must be removed before application.

Question 4

What is the minimum compressive strength of concrete required as an acceptable EIFS substrate?

Accepted Answer

2,000 psi

Answer

A minimum compressive strength of 2,000 psi is generally required for concrete to provide adequate structural support for EIFS without pullout failure.

Question 5

Which type of sheathing is INCOMPATIBLE with certain EIFS adhesives due to its glass mat facing?

Accepted Answer

Exterior gypsum sheathing (DensGlass)

Answer

Some EIFS adhesives are not compatible with glass mat-faced gypsum sheathing and require a specific compatible adhesive or primer per the manufacturer's specifications.

(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