Kentucky Administrative Regulations
Title 815 - PUBLIC PROTECTION CABINET - DEPARTMENT OF HOUSING, BUILDINGS AND CONSTRUCTION
Chapter 20 - Plumbing
Section 815 KAR 20:080 - Waste pipe size

Universal Citation: 815 KY Admin Regs Service 20:080

Current through Register Vol. 50, No. 9, March 1, 2024

RELATES TO: KRS Chapter 318

NECESSITY, FUNCTION, AND CONFORMITY: KRS 318.130 requires the department to promulgate administrative regulations establishing the Kentucky State Plumbing Code to regulate plumbing, including the sizes of waste piping. This administrative regulation establishes the minimum size of waste piping required for certain fixtures.

Section 1. The minimum size (nominal inside diameter) of traps, soil, or waste branches for a given fixture shall not be less than that established in the following table:

Minimum Size (in inches)

Fixture Unit

Trap

Branch

Automatic clothes washer

2

2

2

Basement floor drain

3

3

3

Bath: sitz

1 1/2

1 1/2

2

Bathtub

1 1/2

1 1/2

1 1/2

Combination fixture

2

2

2

Dental cuspidor

2

2

2

Dishwasher

1 1/2

1 1/2

1 1/2

Disposal unit

1 1/2

1 1/2

1 1/2

Drinking fountain

1 1/4

1 1/4

1

Floor drain in residential laundry room

2

2

2

Floor drain in toilet room

3

3

3

Floor drain in utility room

3

3

3

Industrial floor drain

4

4

4

Kitchen sink unit

1 1/2

1 1/2

1 1/2

Laundry tray

1 1/2

1 1/2

1 1/2

Lavatories

1 1/4

1 1/4

1

Santistand

3

4

6

Shower stall

1 1/2

1 1/2

1 1/2

Sink: bar or soda fountain

1 1/2

1 1/2

1 1/2

Sink: barium

2

2

2

Sink: chemical

1 1/2

1 1/2

1 1/2

Sink: clinic

3

4

6

Sink: kitchen, residence

1 1/2

1 1/2

1 1/2

Sink: plaster

2

2

2

Sink: service

3

3

3

Sink: service wall type

2

2

2

Sink: three compartment

2

2

2

Urinal: lip

1 1/2

1 1/2

1 1/2

Urinal: pedestal

3

3

3

Urinal: stall

2

2

2

Urinal: trough

1 1/2

1 1/2

1 1/2

Water closet: Greater than 1.6 gallons per flush

3

3 or 4

6

Water closet: 1.6 gallons per flush or less

3

3 or 4

4

STATUTORY AUTHORITY: KRS 198B.040(10), 318.130

Disclaimer: These regulations may not be the most recent version. Kentucky may have more current or accurate information. We make no warranties or guarantees about the accuracy, completeness, or adequacy of the information contained on this site or the information linked to on the state site. Please check official sources.
This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.