IDFX - Interior Design Fundamentals Exam Materials and Finishes 1

Question 1

When specifying upholstery fabric for heavy-duty contract applications such as airport or stadium seating, what minimum Wyzenbeek double-rub count is the accepted industry benchmark for durability?

Accepted Answer

100,000 double rubs

Answer

15,000 double rubs

Answer

30,000 double rubs

Answer

250,000 double rubs

Question 2

The Porcelain Enamel Institute (PEI) wear rating classifies ceramic and porcelain tile from Group 0 to Group 5. Which PEI group is the minimum recommended for residential floor areas that receive normal foot traffic, excluding high-traffic entryways?

Accepted Answer

Group 3

Answer

Group 1

Answer

Group 2

Answer

Group 4

Question 3

The Janka hardness test is the standard method for rating the hardness of wood flooring species. What does the test specifically measure?

Accepted Answer

The force in pounds required to embed a 0.444-inch steel ball to half its diameter into the wood surface

Answer

The tensile load at which a wood specimen fractures along the grain

Answer

The compressive strength of wood measured at the cellular level

Answer

The density of wood fibers expressed in pounds per cubic foot

Question 4

ASTM E84 (the Steiner Tunnel Test) rates interior finish materials on two fire-related indices. What is the maximum permissible Smoke Developed Index (SDI) for a Class A (Class I) interior finish rating?

Accepted Answer

450

Answer

25

Answer

75

Answer

200

Question 5

An interior designer is selecting a stone floor finish for a spa wet room where slip resistance is the primary concern. Which stone surface finish offers the highest slip resistance?

Accepted Answer

Flamed (thermal)

Answer

Polished

Answer

Honed

Answer

Brushed

Question 6

Under LEED v4 Interior Design + Construction (ID+C) low-emitting materials credits, which third-party certification standard is commonly referenced to verify that architectural paints and coatings meet allowable VOC content limits?

Accepted Answer

Green Seal GS-11

Answer

ASTM D3960

Answer

EPA Method 24

Answer

ISO 11890-1