CTI Movement Joints & Expansion Joints

Question 1

Which TCNA specification number specifically covers movement joint requirements in tile installations?

Accepted Answer

EJ171

Answer

EJ141

Answer

EJ201

Answer

EJ251

Question 2

What is the minimum recommended width for movement joints in tile installations per TCNA EJ171?

Accepted Answer

1/4 inch

Answer

1/8 inch

Answer

3/8 inch

Answer

1/2 inch

Question 3

For interior tile installations, what is the maximum recommended spacing between movement joints per TCNA EJ171?

Accepted Answer

20–25 feet in each direction

Answer

8–12 feet in each direction

Answer

16–18 feet in each direction

Answer

30–35 feet in each direction

Question 4

Movement joints must be installed wherever tile abuts which type of surfaces?

Accepted Answer

Restraining surfaces such as walls, curbs, columns, pipes, and changes in plane

Answer

Only exterior masonry walls

Answer

Only plumbing fixtures and drains

Answer

Perimeter walls in commercial projects only

Question 5

What type of sealant is recommended for movement joints in wet or exterior tile areas?

Accepted Answer

Silicone or polyurethane sealant

Answer

Sanded Portland cement grout

Answer

Epoxy grout

Answer

Latex-modified unsanded grout

Question 6

What is the most likely consequence when movement joints are entirely omitted from a large tile installation?

Accepted Answer

Cracking, delamination, or tile lifting due to unrelieved thermal and structural movement

Answer

Grout lines become darker over time

Answer

Faster moisture absorption through the tile surface

Answer

Accelerated efflorescence in grout joints

Question 7

Movement joints located over structural building expansion joints should be:

Accepted Answer

The same width as or wider than the underlying structural joint

Answer

Narrower than the structural joint to save space

Answer

Filled with rigid epoxy grout for stability

Answer

Omitted when the tile bond is strong enough