IPC - International Plumbing Code Plumbing Fixtures and Fittings 2

Question 1

A plumber is roughing in a residential shower compartment. According to the IPC, what is the minimum required floor area for a shower compartment, and what is the minimum allowable dimension in any direction?

Accepted Answer

900 square inches with no dimension less than 30 inches

Answer

IPC Section 608.4.2 requires shower compartments to have a minimum floor area of 900 square inches, with no dimension measuring less than 30 inches. This ensures adequate space for safe use and access, and a 30-inch × 30-inch square is the smallest compliant footprint.

Question 2

During a bathtub installation, the inspector verifies the overflow outlet position. According to the IPC, the overflow inlet must be located at what minimum distance below the bathtub's flood-level rim?

Accepted Answer

1 inch below the flood-level rim

Answer

IPC Section 407.2 requires that the overflow inlet of a bathtub be positioned not less than 1 inch below the flood-level rim of the tub. This placement ensures the overflow activates before water can spill over the rim, protecting against flooding.

Question 3

A plumber is selecting and installing a urinal in a commercial men's restroom. What does the IPC require regarding the trap for a wall-hung urinal?

Accepted Answer

The urinal must be of the integral trap type, incorporating the trap within the fixture itself

Answer

IPC Section 1002.2 requires that urinals be of the integral trap type — meaning the trap is built into the fixture body rather than added externally. This design prevents sewer gases from entering the space while accounting for the unique geometry of urinal drainage.

Question 4

A standpipe receptor is being installed to accept discharge from a residential clothes washing machine. According to the IPC, what are the required minimum and maximum heights for the standpipe measured from the trap weir?

Accepted Answer

Minimum 18 inches, maximum 42 inches

Answer

IPC Section 802.3 specifies that standpipe receptors for clothes washers must extend a minimum of 18 inches and a maximum of 42 inches above the trap weir. This range accommodates the washing machine's discharge hose height while preventing the hose from being submerged in backflow water.

Question 5

A contractor is specifying water closets for a new office building. According to the IPC, what is the maximum allowable water consumption per flush for a flushometer-valve or tank-type water closet?

Accepted Answer

1.6 gallons per flush

Answer

IPC Section 402.2 sets the maximum flush volume for water closets at 1.6 gallons per flush (gpf). This is a federal standard incorporated into the IPC to conserve water. Some high-efficiency models use 1.28 gpf, but 1.6 gpf is the code-maximum permitted by the IPC.

IPC - International Plumbing Code Practice Test

IPC - International Plumbing Code Practice Test

IPC - International Plumbing Code Plumbing Fixtures and Fittings 2