306A Fixture Installation

Question 1

What is the standard rough-in measurement for a residential water closet from the finished wall to the centre of the closet flange?

Accepted Answer

12 inches (305 mm)

Answer

10 inches (254 mm)

Answer

14 inches (356 mm)

Answer

16 inches (406 mm)

Question 2

What type of wax seal is recommended for a water closet installed on a flange that is below the finished floor level?

Accepted Answer

Extra-thick wax ring or stacked wax rings

Answer

Standard wax ring

Answer

Silicone gasket only

Answer

No seal is needed if the flange is tight

Question 3

What is the correct height for a wall-mounted lavatory in a residential bathroom?

Accepted Answer

800 mm (31 inches) from floor to rim

Answer

600 mm (24 inches) from floor to rim

Answer

750 mm (30 inches) from floor to rim

Answer

900 mm (36 inches) from floor to rim

Question 4

What is the minimum centre-to-centre distance between two adjacent water closets?

Accepted Answer

760 mm (30 inches)

Answer

300 mm (12 inches)

Answer

380 mm (15 inches)

Answer

600 mm (24 inches)

Question 5

When installing a bathtub, what must be done to protect the subflooring?

Accepted Answer

Install a waterproof membrane or liner under and behind the tub

Answer

Nothing — bathtubs are waterproof

Answer

Only seal the drain connection

Answer

Paint the subflooring with primer

Question 6

What is the purpose of a 'trim kit' when installing a shower valve?

Accepted Answer

To provide the visible handle, escutcheon plate, and showerhead or spout connection on the finished wall surface

Answer

To seal the valve body to the pipe

Answer

To test the valve before use

Answer

To insulate the hot water pipe