CTI CTI Substrate Preparation & Waterproofing

Question 1

What is the maximum allowable floor deflection for a substrate intended for tile installation per TCNA guidelines?

Accepted Answer

L/360

Answer

L/180

Answer

L/240

Answer

L/120

Question 2

Which moisture test measures vapor emission rate in pounds per 1,000 sq ft per 24 hours on a concrete slab?

Accepted Answer

Calcium chloride test

Answer

Relative humidity probe test

Answer

Phenolphthalein test

Answer

ASTM F2170 probe

Question 3

What is the maximum acceptable moisture content for a wood subfloor before tile installation?

Accepted Answer

19%

Answer

25%

Answer

15%

Answer

10%

Question 4

Which type of waterproofing membrane is applied as a liquid and cures to form a seamless, continuous layer?

Accepted Answer

Bonded (liquid-applied) waterproofing membrane

Answer

Sheet membrane

Answer

Foam backer rod

Answer

Cleavage membrane

Question 5

What is the primary purpose of a cleavage membrane in a mortar bed installation?

Accepted Answer

Allow the mortar bed to float independently of the substrate

Answer

Bond the tile directly to the subfloor

Answer

Provide electrical grounding for heated floors

Answer

Increase the thermal R-value of the assembly

Question 6

When inspecting a shower pan liner installation, how high must the liner extend above the rough shower curb?

Accepted Answer

2 inches

Answer

1 inch

Answer

To the top of the tile

Answer

3 inches above the shower floor