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

10%

Answer

25%

Answer

30%

Question 2

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

Accepted Answer

Efflorescence on concrete masonry

Answer

Minor surface discoloration

Answer

Hairline cracks less than 1/16 inch

Answer

Slight texture variation

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

They improve adhesion to the substrate

Answer

They reduce the wall's R-value

Answer

They are required for smooth surface preparation

Question 4

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

Accepted Answer

2,000 psi

Answer

1,000 psi

Answer

3,000 psi

Answer

5,000 psi

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

OSB (Oriented Strand Board)

Answer

Plywood

Answer

Exterior fiber cement board

Question 6

Before applying EIFS to a previously painted concrete surface, an inspector should verify that the existing paint is:

Accepted Answer

Well-bonded and not peeling

Answer

At least 10 years old

Answer

Oil-based rather than latex

Answer

Applied in multiple coats

Question 7

What test is commonly used in the field to assess the bond strength of an existing coating or substrate before EIFS installation?

Accepted Answer

Pull-off adhesion test

Answer

Schmidt hammer test

Answer

Moisture probe test

Answer

Core compressive test