Residential Plumbing Rough-In Inspection Checklist

1. 1. Is the job address posted in a visible location?

2. 2. Is the permit and approved plans on-site and accessible to the inspector?

3. 3. Is the permit information correct (e.g., address, permit number, description of work, etc.)?

4. 4. Is it confirmed that all fixtures are included?

5. 4. Is it confirmed that all fixtures are included?

1. 1. Are only and all fixtures installed on a floor level lower than the next upstream manhole cover fed through an accessible backwater valve?

2. 2. Are cleanouts on piping with backwater valves properly labeled?

3. 3. Are backwater valves always accessible for inspection and repair?

4. 4. Are there no pipes directly embedded in concrete, and are all pipes passing through concrete walls or floors protected from breakage with voids sealed as necessary?

5. 5. Are sleeves used for piping passing through concrete or masonry that are not bored or drilled?

6. 6. In horizontal wet venting, are vent pipe inverts taken off above the center line of the drain?

7. 7. Are vents installed downstream of traps?

8. 8. Are pipe trenches parallel and deeper than footings offset a minimum of 45 degrees from the footing bearing line or as approved in accordance with ?

9. 9. Are Type L copper water lines installed underground? Type M is allowed underground outside the building. Are copper joints under a slab brazed?

10. 10. Are drains, waste, and vents (DWV) water-tested with a 10-foot head for 15 minutes or air-tested at 5 psi for 15 minutes? Is plastic pipe allowed to be tested with air?

11. 11. Is water piping tested to the working pressure or 50 psi for 15 minutes? Is plastic water piping allowed to be tested with air, except PEX piping (per the manufacturer), which shall be tested with air when subject to freezing?

12. 12. Is the piping laid on a firm bed?

1. 1. Are only fixtures on floor levels below the crown level of the sewer allowed to discharge through an ejector?

2. 2. Are backwater and gate/ball valves properly installed on the pump discharge?

3. 3. Are the ejectors sized for 2 fixture units per gallon per minute of flow? Are there 40 fixture units minimum with a water closet requiring a 4-inch minimum pipe?

4. 4. Is there a minimum 2-inch discharge pressure type pipe when a water closet discharges to the sump?

5. 5. Is the ejector lifted to a horizontal sewer and then drained by gravity? If the connection is to a horizontal sewer, is it connected at the top with a wye-type branch fitting?

6. 6. Do pump(s) have audio and visual alarms and are readily accessible?

7. 7. Is the sump tank top provided with a vent size for the fixtures sump as per UPC Table 703.2?

1. 1. Are drains, waste, and vents (DWV) water-tested with a 10-foot head for 15 minutes or air-tested at 5 psi for 15 minutes? Is plastic pipe allowed to be tested with air?

2. 2. Are drains properly sized?

3. 3. Are back-to-back fixtures fitted with double fixture fitting?

4. 4. Are changes in direction from vertical-to-horizontal or horizontal-to-horizontal done through wye branches or 45-degree wye branches or fittings of equal sweep?

5. 5. Are tub waste openings into crawl spaces properly closed off with metal collars or metal screens fastened to structures with openings no greater than ½ inch?

6. 6. Are double sanitary tees used when the barrel of the stack is two pipe sizes larger than the inlets for connecting with a vertical stack?

7. 7. Are 18-gauge nail plates installed 1-1/2 inches beyond the outside diameter of the pipe when plastic or copper plumbing is within 1 inch of the face of the framing?

8. 8. Do hangers and straps not compress, distort, cut, or abrade the piping and allow free movement of pipe? Are pipes exposed to damage by sharp surfaces protected? (Manufacturer’s Installation Instructions;)

9. 9. Is plastic piping supported at every 4 feet and at each horizontal branch connection?

10. 10. Is vertical plastic piping supported at the base and on each floor? Are mid-story guides provided?

11. 11. Is horizontal cast iron hubless supported at every other joint, unless over 4 feet, then is each joint supported? Is the support adjacent to the joint, and does not exceed 18 inches? Is each horizontal branch connection supported? Are hangers not placed on the coupling?

12. 12. Is vertical cast iron hubless supported at the base and each floor not to exceed 15 feet?

13. 13. Are waste pipes installed outside or in exterior walls protected from freezing where necessary, P-traps, for example?

1. 1. Is each trap protected by a vent, and is the vent system designed to prevent a trap seal from being exposed to a pressure differential that exceeds a 1-inch water column on the outlet side of the trap?

2. 2. Is each trap protected by a vent?

3. 3. Does the developed length of the trap arm not exceed the limits specified in UPC Table 1002.2 based on the pipe size?

4. 4. Does the development length between the trap of a water closet or similar fixture (measured from the top of the closet flange to the inner edge of the vent) and its vent not exceed 6 feet?

5. 5. Are trap arms less than 3 inches not changing direction more than 90 degrees without the use of a cleanout?

6. 6. Are trap arms of 3 inches and larger not changing direction more than 135 degrees without the use of a cleanout?

7. 7. Is the vertical distance between the fixture outlet and the trap kept as short as practicable and not over 24 inches in length (or a maximum of 30 inches for clothes washers)?

1. 1. Is each horizontal drainage pipe provided with a cleanout at its upper terminal and each run of piping more than 100 feet in total developed length provided with a cleanout for each 100 feet or fraction thereof?

2. 2. Are cleanouts omitted at horizontal runs less than 5 feet, except for sinks?

3. 3. Have cleanouts been omitted on any horizontal drainage pipe installed on a slope of 72 degrees or less from the vertical angle?

4. 4. Are cleanouts not required above the floor level of the lowest floor of the building, except for the building drain and its branches?

5. 5. Is an approved two-way cleanout fitting installed inside the building wall near the connection between the building drain and building sewer or installed outside of a building at the lower end of a building drain and extended to grade, substituted for an upper terminal cleanout?

6. 6. Are cleanouts required at each aggregate horizontal change of direction exceeding 135 degrees?

7. 7. Is each cleanout installed so that it opens to allow cleaning in the direction of flow of the soil or waste or at right angles thereto and, except in the case of wye branch and end-of-line cleanouts, installed vertically above the flow line of the pipe?

8. 8. Is each underfloor cleanout located not more than 5 feet from an access door with an unobstructed 30-inch wide by 18-inch high pathway?

9. 9. Do cleanouts extend above the floor or outdoors when access is limited?

1. 1. Does the loop vent method require fittings of the drainage type on vents below the floor?

2. 2. Does the drain serving the island serve no other fixtures upstream from the return vent?

3. 3. Is there an accessible cleanout in the vertical section of the foot vent?

1. 1. Is the vent rising vertically 6 inches above the flood level rim before continuing to the horizontal, unless prohibited by structural conditions?

2. 2. Are vent pipe fittings located less than 6 inches above the flood-level rim of the drainage pattern, and does the pipe have the required drainage slope?

3. 3. Are takeoffs for vents located above the trap weir, except for water closets and similar fixtures?

4. 4. Are vent pipe inverts taken off above the center line of the horizontal drainage pipe, except in the case of horizontal wet vents?

5. 5. Is the aggregate vent area equal to or greater than the building drain?

6. 6. Are vents terminated a minimum of 6 inches above the roof (or 10 inches in high snow load areas)?

7. 7. Do vent clearances to building openings meet the requirements of 3 feet above or 10 feet horizontal?

1. 1. Are the local jurisdiction's regulations verified when allowed?

2. 2. Are the air-admittance valves installed a minimum of 4 inches above the drain? (Per local jurisdiction and manufacturer’s installation instructions)

3. 3. Are the air-admittance valves installed a minimum of 6 inches above the insulation in the attic? (Per local jurisdiction and manufacturer’s installation instructions)

4. 4. Is the air-admittance valve accessible and open to airflow? (Per local jurisdiction and manufacturer’s installation instructions)

5. 5. Is the air-admittance valve installed in a vertical position as high as possible? (Per local jurisdiction and manufacturer’s installation instructions)

1. 1. Is the vertical wet vent not greater than 6 feet in developed length, serving all fixtures on the same story?

2. 2. Are the wet vent pipes at least one size larger than the required waste for the upper fixture and one size larger than the minimum vent size for fixture units for the lower fixture, with a minimum size of 2 inches?

3. 3. Is the use of horizontal wet vents limited to traps of one and two fixture units?

4. 4. Does the wet vent not serve as a vent for more than four fixtures?

5. 5. Is horizontal wet venting allowed for a bathroom group located on the same floor, and is it installed in compliance with UPC 908.2 or any applicable Washington State Amendment?

1. 1. Is the pipe and meter size verified in compliance with UPC Table 610.4 Appendix A or any fire sprinkler plans?

2. 2. Is the minimum service size 3/4 inches as required by ?

3. 3. Is the maximum unregulated water pressure not exceeding 80 psi as per?

4. 4. Is the main valve on the discharge side of the meter a full-way type as required by?

5. 5. Are dielectric fittings or other approved fittings used between galvanized and copper piping?

6. 6. Has the replacement of metal pipe water service with plastic pipe water service been checked to ensure it has not affected the building grounding system?

7. 7. Is backflow prevention installed for protection from fire sprinkler systems, irrigation systems, or other cross-connections or contaminations? (Washington State Cross-Control Manual)

8. 8. Is the water service buried deep enough to protect it from freezing? Is the minimum typically 18 inches or 12 inches below frost level (varies from jurisdiction to jurisdiction?

9. 9. Are the materials, including copper, polyethylene, PVC, CPVC, PEX, galvanized pipe, associated cement, sealers, solder, thread sealants, and flux, approved by the AHJ and meeting the requirements of NSF 61? Are they installed as per the manufacturer's installation requirements?

10. 10. Are water lines tested to the working pressure or 50 psi for 15 minutes? Is plastic water piping not allowed to be tested with air, except PEX piping (per the manufacturer), which shall be tested with air when subject to freezing? CPVC water supplies under a slab require a pressure test of 150 psi for two hours.

11. 11. Inside the building, are barbed insert fittings with hose clamps on plastic water pipes prohibited? Is a Ford fitting or an equal installed?

12. 12. Is the water pressure verified, and if it exceeds 80 pounds, has a pressure-reducing valve been installed? Plastic water piping cannot be air tested (except PEX, at less than 100 psi, per manufacturer).

13. 13. Are water pipes not in the same trench as building sewer or drainage piping constructed of clay or materials that are not approved for use within a building unless both of the following conditions are met? Is the bottom of the water pipe, at all points, at least 12 inches above the top of the sewer or drain line, and is the water pipe placed on a solid shelf excavated at one side of the common trench with a minimum clear horizontal distance of at least 12 inches from the sewer or drain line?

14. 14. If water pipes cross sewer or drainage piping constructed of clay or materials that are not approved for use within a building, are they laid a minimum of 12 inches above the sewer or drain pipe, as outlined in ?

15. 15. Is water piping installed within a building and in or under a concrete floor or slab resting on the ground installed ?

16. 16. Does ferrous piping have a protective coating of an approved type, machine-applied and conforming to recognized standards, with field wrapping provided for equivalent protection for short sections and fittings necessarily stripped for threading? Is it understood that galvanized coating is not deemed adequate protection for piping or fittings, and approved non-ferrous piping is not required to be wrapped.

17. 17. Has underground copper tubing been installed without joints where possible? Where joints are permitted, have they been properly brazed, and are fittings of wrought copper within the fixed limits of the building foundation?

18. 18. Have valves, including pressure-reducing valves, if installed in the ground, been equipped with access boxes.

19. 19. For the replacement of metallic water services, is the water pipe replaced with a metallic pipe or an approved grounding system installed when installing plastic water pipe? As per the electrical code, is a minimum of 10 feet of copper piping installed in the ground on the house side to maintain the existing electrical grounding system? If 10 feet of metallic piping cannot be installed is the building official consulted for a viable option? Is blue 18-gauge tracer wire, or another approved conductor, required from the meter to the foundation?

20. 20. Is unsuitable bedding and backfill such as rock larger than 3/4-inch, asphalt, and debris cannot be installed below or above the water service? If backfill material looks bad is the select fill minimum 6 inches below and 12 inches above the water service? Is the fill prior inspected for covering?

21. 21. Are building shutoff valves required to be full-way type?

1. 1. Is the requirement for adequate backflow prevention met when the building has a fire sprinkler system that is not a flow-through system, and has a reduced pressure backflow preventer (RPBP) been installed when there is a water supply to a boiler or another high hazard? If a backflow device such as an RPBP or DCVA, has it been verified that it has been tested and approved by a certified backflow tester?

2. 2. Are water hammer arrestors installed on water supply systems where quick-closing valves are used, and are they located according to the manufacturer's specifications?

3. 3. Are hot and cold-water lines installed outside the building or conditioned space insulated with a minimum R-3?

4. 4. Are water lines tested to the working pressure or 50 psi for 15 minutes? Is plastic water piping not allowed to be tested with air, except PEX piping (per the manufacturer), which shall be tested with air when subject to freezing?

1. 1. Are standpipe receptors greater than or equal to 18 inches and less than or equal to 30 inches above the trap?

2. 2. Is there no trap for the clothes washer standpipe installed below the floor?

3. 3. Is the trap weir roughed in a minimum of 6 inches and a maximum of 18 inches above the floor?

4. 4. Have water hammer arrestors been installed for the laundry system, and are they located according to the manufacturer's specifications?

1. 1. Is there an air gap required for the dishwasher drain?

2. 2. Have water hammer arrestors been installed for the kitchen's water supply system, and are they located according to the manufacturer's specifications?

1. 1. Are faucet and showerhead fittings rigidly supported as required by ?

2. 2. Does the minimum shower area meet the requirement of 900 square inches with a 30-inch clear diameter of 70 inches from the floor of the shower?

3. 3. Is the minimum shower rough pan size 30 inches by 30 inches as specified?

4. 4. Is a listed anti-scald/pressure balance valve required for showers to ensure a maximum of 120 degrees Fahrenheit, and are they properly installed?

5. 5. Is the water closet set a minimum of 15 inches to the center from the side wall with a total clear width of 30 inches and 21 inches at the front?

6. 6. Are the closet flanges secured with corrosion-resistant fasteners?

7. 7. Is the maximum distance between the closet ring and vent within 6 feet?

8. 8. Are slip joints used at the tub drain accessible with a minimum 12-inch by 12-inch access door?

9. 9. Are over-rim tub faucets set with a minimum 1-inch air gap to the tub rim?

10. 10. Are the bathtub and whirlpool tubs filler unit temperature limited to 120 degrees Fahrenheit, following ASSE 1070/ASME A112.1070 requirements?

1. 1. Have the minimum dimensions specified in the previous section been met for shower subpans?

2. 2. Is the dam height greater than or equal to 2 inches and less than or equal to 9 inches, with an exception for accessible showers, where the dam height should be a maximum of 1/2 inch? Is it understood that the dam is measured from the top of the drain to the top of the dam as per UPC 408.5 and ANSI A117.1-2009?

3. 3. Has an approved listed pan liner been used, such as the 3 layers of hot mop type 15 lb. felt or another approved membrane, as required?

4. 4. Is the pan liner a minimum of 3 inches above the finished dam?

5. 5. Are approved liners installed per the manufacturer's installation instructions as outlined in ?

6. 6. Does the slope or pitch of the lining meet the minimum requirement of ¼ inch per foot, as specified ?

7. 7. Are there no fasteners less than 1 inch above the finished dam?

8. 8. Are the weep holes at the drain clear?

9. 9. Does the doorway have a minimum finished opening of 22 inches wide, as required?

10. 10. Is the shower head positioned so that it cannot discharge directly at the entrance?

11. 11. Has a test for the shower receptor been conducted, in accordance with UPC 408.7.5?

12. 12. For permanent seats in the shower, is there a 1/4-inch per foot pitch as required by?

1. 1. Are there vacuum breakers on all hose faucets?

2. 2. Is backflow protection on all irrigation systems available?

3. 3. Are there no valves downstream of vacuum breakers?