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

Stud color coating

Answer

Stud manufacturer's country of origin

Answer

Metal stud gauge less than 25

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

Hairline crazing on the surface

Answer

Surface weathering and chalking

Answer

Color variation from age

Question 3

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

Accepted Answer

28 days

Answer

7 days

Answer

14 days

Answer

60 days

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

Accept it as is since OSB is acceptable facing either way

Answer

Apply additional primer to compensate

Answer

Increase fastener count to compensate for improper installation

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 installed at panel centers only

Answer

Fasteners driven through the sheathing face by 1/4 inch

Answer

Fasteners placed at 24 inches on center along edges

Question 6

When inspecting a substrate for EIFS application, what does a 'hollow' sound when tapping indicate?

Accepted Answer

Delamination or voids behind the surface

Answer

Properly cured concrete

Answer

High moisture content

Answer

Correct installation of drainage cavity

Question 7

What is the maximum out-of-plane tolerance (flatness) typically required for an EIFS substrate?

Accepted Answer

1/4 inch in 10 feet

Answer

1/8 inch in 10 feet

Answer

1/2 inch in 10 feet

Answer

1 inch in 10 feet