CTI Movement Joints & Expansion Joints

Question 1

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

Accepted Answer

EJ171

Answer

TCNA EJ171 is the industry-standard specification that defines movement joint requirements, placement, and materials for tile installations.

Question 2

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

Accepted Answer

1/4 inch

Answer

TCNA EJ171 specifies a minimum movement joint width of 1/4 inch to allow adequate sealant performance and accommodate thermal movement.

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

TCNA EJ171 recommends movement joints at maximum 20–25 feet in each direction for interior tile installations to relieve built-up stresses.

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

Per TCNA EJ171, movement joints are required wherever tile meets any restraining surface — walls, curbs, columns, pipes, or changes in plane — to prevent stress concentration.

Question 5

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

Accepted Answer

Silicone or polyurethane sealant

Answer

Silicone or polyurethane sealants are flexible, waterproof, and bond to tile edges, making them the correct choice for movement joints especially in wet or exterior conditions.

CTI - Certified Tile Inspector Practice Test

CTI - Certified Tile Inspector Practice Test

CTI Movement Joints & Expansion Joints