306A Fixture Installation 4

Question 1

What is the proper method for levelling a bathtub during installation?

Accepted Answer

Use wooden shims under the tub feet and set in a mortar bed

Answer

Bathtubs should be levelled using shims or set in a mortar bed to ensure proper drainage and prevent flexing. Some manufacturers recommend a slight pitch toward the drain, but the rim should be level for proper water containment.

Question 2

What is the minimum trap size for a residential shower drain?

Accepted Answer

2 inch

Answer

Residential showers require a minimum 2-inch trap because of the relatively high flow rate from showerheads and the continuous nature of shower drainage during use.

Question 3

When installing a wall-hung water closet, what must be installed within the wall?

Accepted Answer

A concealed carrier frame engineered to support the weight of the toilet and user

Answer

A wall-hung water closet requires a concealed steel carrier frame that transfers the weight load to the floor structure. These carriers are engineered to support the toilet plus the user's weight (typically rated for 200 kg or more).

Question 4

What is the purpose of insulating hot water supply pipes under a kitchen or bathroom sink?

Accepted Answer

To protect users from burns if they contact the hot pipe, particularly in accessible installations

Answer

Insulating exposed hot water pipes under sinks protects users from burn injuries if they accidentally touch the pipe. This is particularly important in accessible installations where wheelchair users may have legs positioned near the pipes.

Question 5

What is the standard rough-in height for a tub spout?

Accepted Answer

100 mm (4 inches) above the tub rim

Answer

The standard rough-in height for a tub spout is approximately 100 mm (4 inches) above the tub rim, providing clearance for the spout to discharge into the tub without excessive splashing.

Red Seal Plumber 306A Practice Test

Red Seal Plumber 306A Practice Test

306A Fixture Installation 4