CHAPTER 4

PLUMBING FIXTURES AND FIXTURE FITTINGS

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401.0 Materials – General Requirements.

401.1 Quality of Fixtures. Plumbing fixtures shall beconstructed of dense, durable, non-absorbent mate-rials and shall have smooth, impervious surfaces, freefrom unnecessary concealed fouling surfaces. Exceptas permitted elsewhere in this code, fixtures shallconform in quality and design to nationally recog-nized applicable standards included in Table 14-1.

401.2 Lead. Sheet lead shall be not less than thefollowing:

For safe pans not less than four (4) pounds persquare foot (19.5 kg/m2) or one-sixteenth (1/16) ofan inch (1.6 mm) thick. (See Table 14-1)

401.3 Plumbing fixture fittings covered under thescope of NSF 61 shall comply with the requirementsof NSF 61.

402.0 Water-Conserving Fixtures and Fittings.

402.1 Flush volumes for low-consumption andwater-saver water closets and urinals shall be inaccordance with applicable standards referenced inTable 14-1.

402.2 Water Closets. Water closets, either flushtank, flushometer tank, or flushometer valve oper-ated, shall have an average consumption of amaximum of 1.6 gallons (6.1 liters) of water perflush.

402.3 Urinals. Urinals shall have an average waterconsumption of a maximum of 1 gallon (3.8 liters) ofwater per flush.

402.3.1 Nonwater Urinals. Nonwater urinalsshall be listed and comply with the applicablestandards referenced in Table 14-1. Nonwaterurinals shall have a barrier liquid sealant to main-tain a trap seal. Nonwater urinals shall permit theuninhibited flow of waste through the urinal tothe sanitary drainage system. Nonwater urinalsshall be cleaned and maintained in accordancewith the manufacturer’s instructions after instal-lation. Where nonwater urinals are installed theyshall have a water distribution line rough-in tothe urinal location to allow for the installation ofan approved backflow prevention device in theevent of a retrofit.

402.4 Metered Faucets. Self-closing or self-closingmetering faucets shall be installed on lavatoriesintended to serve the transient public, such as thosein, but not limited to, service stations, train stations,airports, restaurants, and convention halls. Metered

faucets shall deliver a maximum of 0.26 gallons (1.0liter) of water per use.

402.5 Emergency Safety Showers. Emergencysafety showers shall not be limited in their watersupply flow rates.

402.6 Installation. Water-conserving fixtures shallbe installed in strict accordance with the manufac-turer’s instructions to maintain their rated perfor-mance.

403.0 Overflows.

When any fixture is provided with an overflow, thewaste shall be so arranged that the standing water inthe fixture cannot rise in the overflow when thestopper is closed or remain in the overflow when thefixture is empty. The overflow pipe from a fixtureshall be connected on the house or inlet side of thefixture trap, except that overflow on flush tanks shallbe permitted to discharge into the water closets orurinals served by them, but it shall be unlawful toconnect such overflows with any other part of thedrainage system.

404.0 Strainers and Connections.

404.1 Strainers. Plumbing fixtures, other than waterclosets and urinals, shall be equipped with approvedstrainers having an approved waterway area.Strainers serving shower drains shall have awaterway equivalent to the area of the tailpiece.

404.2 Connections. Fixtures having concealed slipjoint connections shall be provided with an accesspanel or utility space not less than twelve (12) inches(305 mm) in its least dimension and so arrangedwithout obstructions as to make such connectionsaccessible for inspection and repair.

404.3 Continuous wastes and fixture tailpieces shall beconstructed from the materials specified in Section701.0 for drainage piping, provided, however, thatsuch connections where exposed or accessible shall bepermitted to be of seamless drawn brass not less thanNo. 20 B & S Gauge (0.032 inches) (0.8 mm). Each suchtailpiece, continuous waste, or waste and overflowshall be not less than one and one-half (1-1/2) inches(40 mm) O.D. for sinks, dishwashers, laundry tubs,bathtubs, urinals, and similar fixtures, and not lessthan one and one-quarter (1-1/4) inches (32 mm) forlavatories, drinking fountains, and similar smallfixtures.

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404.4 – 408.2

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IDAHO STATE PLUMBING CODE

404.4 Approved wye or other directional-typebranch fittings shall be installed in continuouswastes connecting or receiving the discharge fromfood waste disposal units, dishwashers, clotheswashers, or other force discharge fixtures or appli-ances. No dishwasher drain shall be connected to asink tailpiece, continuous waste, or trap on thedischarge side of a food waste disposal unit.

405.0 Prohibited Fixtures.

405.1 Water closets having an invisible seal or anunventilated space or having walls which are notthoroughly washed at each discharge shall beprohibited. Any water closet that might permitsiphonage of the contents of the bowl back into thetank shall be prohibited. Drinking fountains shall notbe installed in public toilet rooms.

405.2 Prohibited Urinals. Trough urinals and urinalswith an invisible seal shall be prohibited.

Exception: Non-water urinals.

405.3 Fixed wooden, or tile wash trays or sinks fordomestic use shall not be installed in any buildingdesigned or used for human habitation. No sheetmetal-lined wooden bathtub shall be installed orreconnected. No dry or chemical closet (toilet) shallbe installed in any building used for human habita-tion, unless first approved by the Health Officer.

406.0 Special Fixtures and Specialties.

406.1 Water and Waste Connections. Baptisteries,ornamental and lily ponds, aquaria, ornamentalfountain basins, and similar fixtures and specialtiesrequiring water and/or waste connections shall besubmitted for approval to the Authority HavingJurisdiction prior to installation.

406.2 Restaurant kitchen and other special use sinksshall be permitted to be made of approved-typebonderized and galvanized sheet steel of not lessthan No. 16 U.S. gauge (0.0625 inches) (1.6 mm). Sheet-metal plumbing fixtures shall be adequately designed,constructed, and braced in an approved manner tosatisfactorily accomplish their intended purpose.

406.3 Special Use Fixtures. Special use fixturesshall be made of one of the following:

(1) Soapstone

(2) Chemical stoneware

(3) Copper-based alloy

(4) Nickel-based alloy

(5) Corrosion-resistant steel

(6) Other materials suited for the intended use ofthe fixture.

406.4 Zinc Alloy Components. Zinc alloy compo-nents shall meet the applicable nationally recognizedstandards and shall be used in accordance with theirlisting.

407.0 Installation.

407.1 Cleaning. Plumbing fixtures shall be installedin a manner to afford easy access for repairs andcleaning. Where practical, pipes from fixtures shallbe run to the nearest wall.

407.2 Joints. Where a fixture comes in contact withthe wall or floor, the joint between the fixture andthe wall or floor shall be made water-tight.

407.3 Securing Fixtures. Floor-outlet or floor-mounted fixtures shall be rigidly secured to thedrainage connection and to the floor, when sodesigned, by screws or bolts of copper, brass, orother equally corrosion-resistant material.

407.4 Wall-Hung Fixtures. Wall-hung fixtures shallbe rigidly supported by metal supporting membersso that no strain is transmitted to the connections.Flush tanks and similar appurtenances shall besecured by approved non-corrosive screws or bolts.

407.5 Setting. Fixtures shall be set level and inproper alignment with reference to adjacent walls.No water closet or bidet shall be set closer thanfifteen (15) inches (381 mm) from its center to anyside wall or obstruction nor closer than thirty (30)inches (762 mm) center to center to any similarfixture. The clear space in front of any water closetor bidet shall be not less than twenty-four (24)inches (610 mm). No urinal shall be set closer thantwelve (12) inches (305 mm) from its center to anyside wall or partition nor closer than twenty-four(24) inches (610 mm) center to center.

Exception: The installation of paper dispensersor accessibility grab bars shall not be consid-ered obstructions.

407.6 Installations for Persons with Disabilities.

Where facilities for persons with disabilities arerequired in applicable building regulations, the facil-ities shall be installed in accordance with those regu-lations.

407.7 Supply Fittings. The supply lines and fittingsfor every plumbing fixture shall be so installed as toprevent backflow as required in Chapter 6.

408.0 Water Closets.

408.1 Water closet bowls for public use shall be ofthe elongated type. In nurseries, schools, and othersimilar places where plumbing fixtures are providedfor the use of children less than six (6) years of age,water closets shall be of a size and height suitable forchildren’s use. Water closets shall be equipped withseats as required below.

408.2 Water Closet Seats.

408.2.1 Water closet seats shall be of smooth,non-absorbent material. Seats for public use

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408.2 – 410.5PLUMBING FIXTURES AND FIXTURE FITTINGS

shall conform to the applicable standard refer-enced in Table l4-1.

408.2.2 Water closet seats, for public use, shallbe of the elongated type and either of the openfront type or have an automatic seat coverdispenser.

408.2.3 Water closet seats shall be properly sizedfor the water closet bowl type.

408.3 Securing Floor-Mounted, Back-Outlet WaterCloset Bowls. Floor-mounted, back-outlet watercloset bowls shall be set level with an angle of ninety(90) degrees (1.57 rad) between the floor and wall atthe centerline of the fixture outlet. The floor and wallshall have a flat mounting surface not less than five(5) inches (127 mm) to the right and left of the fixtureoutlet centerline. The fixture shall be secured to thewall outlet flange or drainage connection and to thefloor by corrosion-resistant screws or bolts. Thecloset flange shall be secured to a firm base.

Where floor-mounted, back-outlet water closetsare used, the soil pipe shall be not less than three (3)inches (80 mm) in diameter. Offset, eccentric, orreducing floor flanges shall not be used.

408.4 Closet Rings (Closet Flanges).

408.4.1 Closet rings (closet flanges) for waterclosets or similar fixtures shall be of anapproved type and shall be bronze, copper, hardlead, cast-iron, galvanized malleable iron, ABS,PVC, or other approved materials. Each suchcloset ring (closet flange) shall be approximatelyseven (7) inches (178 mm) in diameter and,when installed, shall, together with the soil pipe,present a one and one-half (1-1/2) inch (38 mm)wide flange or face to receive the fixture gasketor closet seal.

408.4.2 Caulked-on closet rings (closet flanges)shall be not less than one-fourth (1/4) inch (6.4mm) thick and not less than two (2) inches (51mm) in overall depth.

408.4.3 Closet rings (closet flanges) shall beburned or soldered to lead bends or stubs, shallbe caulked to cast-iron soil pipe, shall be solventcemented to ABS and PVC, and shall be screwedor fastened in an approved manner to othermaterials.

408.4.4 Closet rings (closet flanges) shall beadequately designed and secured to supportfixtures connected thereto.

408.4.5 Closet screws, bolts, washers, andsimilar fasteners shall be of brass, copper, orother listed, equally corrosion-resistant mate-rials. Screws and bolts shall be of adequate sizeand number to properly support the fixtureinstalled.

409.0 Urinals.

Every water supply to a urinal shall be protected byan approved-type vacuum breaker or otherapproved backflow prevention device as describedin Section 603.4.

410.0 Flushing Devices for Water Closets andUrinals.

410.1 Flushing Devices Required. Each watercloset, urinal, clinic sink, or other plumbing fixturethat depends on trap siphonage to discharge itswaste contents shall be provided with a flushometervalve, flushometer tank, or flush tank designed andinstalled so as to supply water in sufficient quantityand rate of flow to flush the contents of the fixture towhich it is connected, to cleanse the fixture, and torefill the fixture trap, without excessive water use.Flushing devices shall meet anti-siphon require-ments required in Chapter 6.

410.2 Automatic Flushing Tanks. Tanks flushingmore than one (1) urinal shall be automatic in opera-tion and of sufficient capacity to provide the neces-sary volume to flush and properly cleanse urinalssimultaneously. Automatically controlledflushometer valves shall be permitted to be substi-tuted for flush tanks.

410.3 Flushometer Valves. No manually controlledflushometer valve shall be used to flush more thanone (1) urinal, and each such urinal flushometervalve shall be an approved, self-closing typedischarging a predetermined quantity of water.Flushometers shall be installed so that they will beaccessible for repair. Flushometer valves shall not beused where the water pressure is insufficient toproperly operate them. When the valve is operated,it shall complete the cycle of operation automatically,opening fully and closing positively under the linewater pressure. Each flushometer shall be providedwith a means for regulating the flow through it.

410.4 Water Supply for Flush Tanks. An adequatequantity of water shall be provided to flush andclean the fixture served. The water supply forflushing tanks and flushometer tanks equipped formanual flushing shall be controlled by a float valveor other automatic device designed to refill the tankafter each discharge and to completely shut off thewater flow to the tank when the tank is filled to oper-ational capacity. Provision shall be made to automat-ically supply water to the fixture so as to refill thetrap seal after each flushing. The water supply toflush tanks equipped for automatic flushing shall becontrolled by a suitable timing device.

410.5 Overflows in Flush Tanks. Flush tanks shallbe provided with overflows discharging into the

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water closet or urinal connected thereto. Overflowssupplied as original parts with the fixture shall be ofsufficient size to prevent tank flooding at themaximum rate at which the tank is supplied withwater under normal operating conditions and wheninstalled per manufacturer’s instructions.

411.0 Floor Drains and Shower Stalls.

411.1 Floor drains shall be considered plumbingfixtures, and each such drain shall be provided withan approved-type strainer having a waterway equiv-alent to the area of the tailpiece. Floor drains, floorreceptors, and shower drains shall be of an approvedtype, suitably flanged to provide a water-tight jointin the floor.

411.2 Location of Floor Drains. Floor drains shallbe installed in the following areas:

411.2.1 Toilet rooms containing two (2) or more water closets or a combination of one (1)water closet and one (1) urinal, except in adwelling unit.

411.2.2 Commercial kitchens and in accordancewith Section 704.3.

411.2.3 Laundry rooms in commercial buildingsand common laundry facilities in multi-familydwelling buildings.

411.3 Food Storage Areas. If drains are providedin storerooms, walk-in freezers, walk-in coolers,refrigerated equipment, or other locations wherefood is stored, such drains shall have indirect wastepiping. Separate waste pipes shall be run from eachfood storage area, each with an indirect connectionto the building sanitary drainage system. Traps shallbe provided if required under Section 801.2.2 of thiscode and shall be vented.

Indirect drains shall be permitted to be locatedin freezers or other spaces where freezing tempera-tures are maintained, provided that traps, whensupplied, are located where the seal will not freeze.Otherwise, the floor of the freezer shall be sloped toa floor drain located outside of the storage compart-ment.

411.4 Floor Slope. Floors shall be sloped to floordrains.

411.5 Shower receptors are plumbing fixtures andshall conform to the general requirements containedin Section 401.0. Each such shower receptor shall beconstructed of vitrified china or earthenware,ceramic tile, porcelain-enameled metal, or of suchother material acceptable to the Authority HavingJurisdiction. No shower receptor shall be installedunless it conforms to acceptable standards as refer-enced in Table 14-1 or until a specification or a proto-

type or both of such receptor has first beensubmitted to and approval obtained from theAuthority Having Jurisdiction.

411.6 Each shower receptor shall be an approvedtype and be so constructed as to have a finished dam,curb, or threshold that is not less than one (1) inch(25.4 mm) lower than the sides and back of suchreceptor. In no case shall any dam or threshold beless than two (2) inches (51 mm) or exceeding nine (9)inches (229 mm) in depth when measured from thetop of the dam or threshold to the top of the drain.Each such receptor shall be provided with an integralnailing flange to be located where the receptor meetsthe vertical surface of the finished interior of theshower compartment. The flange shall be water-tightand extend vertically not less than one (1) inch (25.4mm) above the top of the sides of the receptor. Thefinished floor of the receptor shall slope uniformlyfrom the sides toward the drain not less than one-quarter (1/4) inch per foot (20.8 mm/m), nor morethan one-half (1/2) inch per foot (41.8 mm/m).Thresholds shall be of sufficient width to accommo-date a minimum twenty-two (22) inch (559 mm) door.Shower doors shall open so as to maintain not lessthan a twenty-two (22) inch (559 mm) unobstructedopening for egress.

Exception: Showers that are designed to comply with the accessibility standards listed inTable 14-1.

411.7 Shower compartments, regardless of shape,shall have a minimum finished interior of one thou-sand and twenty-four (1,024) square inches (0.66 m2)and shall also be capable of encompassing a thirty (30)inch (762 mm) circle. The minimum required area anddimensions shall be measured at a height equal to thetop of the threshold and at a point tangent to itscenterline. The area and dimensions shall be main-tained to a point of not less than seventy (70) inches(1,778 mm) above the shower drain outlet with noprotrusions other than the fixture valve or valves,shower head, soap dishes, shelves, and safety grabbars or rails. Fold-down seats in accessible showerstalls shall be permitted to protrude into the thirty (30)inch (762 mm) circle.

Exception No. 1: Showers that are designed tocomply with ICC A117.1.

Exception No. 2: The minimum required area anddimension shall not apply for a shower receptorhaving overall dimensions of not less than thirty(30) inches (762 mm) in width and sixty (60)inches (1,524 mm) in length.

411.8 When the construction of on-site built-upshower receptors are permitted by the AuthorityHaving Jurisdiction, receptors built directly on theground shall be water-tight and shall be constructed

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from approved-type dense, nonabsorbent and noncor-rosive materials. Each such receptor shall beadequately reinforced, shall be provided with anapproved flanged floor drain designed to make awater-tight joint in the floor, and shall have smooth,impervious, and durable surfaces.

Shower receptors shall have the subfloor andrough side of walls to a height of not less than three(3) inches (76 mm) above the top of the finished damor threshold shall be first lined with sheet plastic,*lead,* or copper,* or shall be lined with other durableand water-tight materials. Showers that are providedwith a built in place, permanent seat or seating areathat is located within the shower enclosure, shall befirst lined with sheet plastic,* lead,* copper,* or shallbe lined with other durable and water-tight materialsthat extend not less than three (3) inches (76 mm)above horizontal surfaces of the seat or the seatingarea.

Lining materials shall be pitched one-quarter(1/4) inch per foot (20.8 mm/m) to weep holes in thesubdrain of a smooth and solidly formed subbase.Such lining materials shall extend upward on therough jambs of the shower opening to a point notless than three (3) inches (76 mm) above the hori-zontal surfaces of the seat or the seating area, the topof the finished dam or threshold and shall extendoutward over the top of the permanent seat, perma-nent seating area, or rough threshold and be turnedover and fastened on the outside face of both thepermanent seat, permanent seating area, or roughthreshold and the jambs.

Nonmetallic shower subpans or linings shall bepermitted to be built up on the job site of not lessthan three (3) layers of standard, grade fifteen (15)pound (6.8 kg) asphalt-impregnated roofing felt. Thebottom layer shall be fitted to the formed subbaseand each succeeding layer thoroughly hot-moppedto that below. Corners shall be carefully fitted andshall be made strong and water-tight by folding orlapping, and each corner shall be reinforced withsuitable webbing hot-mopped in place.

Folds, laps, and reinforcing webbing shallextend not less than four (4) inches (102 mm) in alldirections from the corner, and webbing shall be ofapproved type and mesh, producing a tensilestrength of not less than fifty (50) psi (344.7 kPa) ineither direction. Nonmetallic shower subpans orlinings shall be permitted to consist of multilayers ofother approved equivalent materials suitably rein-forced and carefully fitted in place on the job site aselsewhere required in this section.

Linings shall be properly recessed and fastenedto approved backing so as not to occupy the spacerequired for the wall covering and shall not be nailed

or perforated at any point that is less than one (1)inch (25.4 mm) above the finished dam or threshold.An approved-type subdrain shall be installed withevery shower subpan or lining. Each such subdrainshall be of the type that sets flush with the subbaseand shall be equipped with a clamping ring or otherdevice to make a tight connection between the liningand the drain. The subdrain shall have weep holesinto the waste line. The weep holes located in thesubdrain clamping ring shall be protected from clog-ging.

Shower lining materials shall conform toapproved standards acceptable to the AuthorityHaving Jurisdiction.

*Note: Lead and copper subpans or linings shall beinsulated from conducting substances other thantheir connecting drain by fifteen (15) pound (6.8 kg)asphalt felt or its equivalent, and no lead pan or linershall be constructed of material weighing less thanfour (4) pounds per square foot (19.5 kg/m2). Copperpans or liners shall be not less than No. 24 B & SGauge (0.02 inches) (0.5 mm). Joints in lead pans orliners shall be burned. Joints in copper pans or linersshall be soldered or brazed. Plastic pans shall not becoated with asphalt-based materials.

411.8.1 Tests for Shower Receptors. Showerreceptors shall be tested for water-tightness byfilling with water to the level of the roughthreshold. The test plug shall be so placed thatboth upper and under sides of the subpan shallbe subjected to the test at the point where it isclamped to the drain.

411.9 Floors of public shower rooms shall have anonskid surface and shall be drained in such amanner that wastewater from one bather shall notpass over areas occupied by other bathers. Guttersin public or gang shower rooms shall have roundedcorners for easy cleaning and shall be sloped notless than two (2) percent toward drains. Drains ingutters shall be spaced at a maximum of eight (8)feet (2,438 mm) from sidewalls nor more thansixteen (16) feet (4,877 mm) apart.

411.10 Location of Valves and Heads. Controlvalves and showerheads shall be located on the side-wall of shower compartments or otherwise arrangedso that the showerhead does not discharge directly atthe entrance to the compartment and the bather canadjust the valves prior to stepping into the showerspray.

411.11 Water Supply Riser. Every water supplyriser from the shower valve to the showerheadoutlet, whether exposed or not, shall be securelyattached to the structure.

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412.0 – 415.0

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IDAHO STATE PLUMBING CODE

412.0 Minimum Number of Required Fixtures.

412.1 Fixture Count. Plumbing fixtures shall beprovided for the type of building occupancy and inthe minimum number shown in Table 4-1.

412.2 Access to Fixtures.

412.2.1 In multi-story buildings, accessibility tothe required fixtures shall not exceed one (1)vertical story.

412.2.2 Fixtures accessible only to private officesshall not be counted to determine compliancewith this section.

412.3 Separate Facilities.

Separate toilet facilities shall be provided for each sex.

Exceptions:

(1) Residential installations.

(2) In occupancies serving ten (10) or fewerpeople, one (1) toilet facility, designed foruse by no more than one (1) person at atime, shall be permitted for use by bothsexes.

(3) In business and mercantile occupancies witha total floor area of fifteen-hundred (1,500)square feet (139.4 m2) or less, one (1) toiletfacility, designed for use by no more thanone (1) person at a time, shall satisfy therequirements for serving customers andemployees of both sexes.

412.4 Fixture Requirements for Special Occupancies.

412.4.1 Additional fixtures may be requiredwhen unusual environmental conditions orreferenced activities are encountered.

412.4.2 In food preparation areas, fixturerequirements may be dictated by health codes.

412.4.3 Types of occupancy not shown in Table 4-1 shall be considered individually by theAuthority Having Jurisdiction.

412.5 Facilities in Mercantile and Business Occu-

pancies Serving Customers.

412.5.1 Requirements for customers andemployees shall be permitted to be met with asingle set of restrooms accessible to both groups.

The required number of fixtures shall be thegreater of the required number for employees orthe required number for customers.

412.5.2 Fixtures for customer use shall bepermitted to be met by providing a centrallylocated facility accessible to several stores. Themaximum distance from entry to any store tothis facility shall not exceed five-hundred (500)feet (152.4 m).

412.5.3 In stores with a floor area of one-hundred and fifty (150) square feet (13.9 m2) orless, the requirement to provide facilities foremployees shall be permitted to be met byproviding a centrally located facility accessibleto several stores. The maximum distance fromentry to any store to this facility shall not exceedthree-hundred (300) feet (91.4 m).

412.6 Toilet Facilities for Workers.

Suitable toilet facilities shall be provided and main-tained in a sanitary condition for the use of workersduring construction.

413.0 Fixtures and Fixture Fittings for Persons

with Disabilities.

Plumbing fixtures and fixture fittings for persons withdisabilities shall conform to the appropriate standardsreferenced in Table 14-1 of this code.

413.1 Limitation of Hot Water Temperature for

Public Lavatories. Hot water delivered from public-use lavatories shall be limited to a maximum tempera-ture of 120˚F (49˚C) by a device that conforms to ASSE1070 or CSA B125.3. The water heater thermostat shallnot be considered a control for meeting this provision.

414.0 Bathtubs and Whirlpool Bathtubs.

Unless otherwise listed, bathtubs and whirlpool bath-tubs shall comply with the following requirements:

414.1 A removable panel shall be provided to accessand remove the pump. Whirlpool pump accesslocated in the crawl space shall be located no morethan twenty (20) feet (6,096 mm) from an access door,trap door, or crawl hole.

414.2 The circulation pump shall be located above thecrown weir of the trap.

414.3 The pump and the circulation piping shall beself-draining to minimize water retention in accor-dance with standards referenced in Table 14-1.

414.4 Suction fittings on whirlpool bathtubs shallcomply with the listed standards.

414.5 Limitation of Hot Water in Bathtubs and

Whirlpool Bathtubs. The maximum hot watertemperature discharging from the bathtub andwhirlpool bathtub filler shall be limited to 120ºF(49ºC) by a device that conforms to ASSE 1070 or CSAB125.3. The water heater thermostat shall not beconsidered a control for meeting this provision.

415.0 Installation of Fixture Fittings.

Where two (2) separate handles control the hot andcold water, the left-hand control of the faucet when

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415.0 - 418.0PLUMBING FIXTURES AND FIXTURE FITTINGS

facing the fixture fitting outlet shall provide the meansto alter the hot water temperature from the fixturefitting.

Single-handle mixing valves shall have the flowof hot water correspond to the markings on the fitting.

416.0 Bidets.

416.1 Materials. Bidets shall conform to the stan-dards listed in Table 14-1.

416.2 Backflow Protection. The water supply to thebidet shall be protected according to Chapter 6,which allows for an airgap or vacuum breaker.

416.3 Limitation of Water Temperature in Bidets.The maximum hot water temperature dischargingfrom a bidet shall be limited to 110ºF (43ºC) by adevice that conforms to ASSE 1070 or CSA B125.3.The water heater thermostat shall not be considereda control for meeting this provision.

417.0 Future Fixtures.

When provisions are made for the future installationof fixtures, those provided for shall be considered indetermining the required sizes of drain pipes.Construction for future installations shall be termi-nated with a plugged fitting or fittings. Where theplugged fitting is at the point where the trap of afixture is installed, the plumbing system for suchfixture shall be complete and conform with theplumbing requirements of this code.

418.0 Shower and Tub-Shower CombinationControl Valves.

Showers and tub-shower combinations in buildingsshall be provided with individual control valves ofthe pressure balance, thermostatic, or combinationpressure balance/thermostatic mixing valve typethat provide scald and thermal shock protection.These valves shall conform to ASSE 1016 or ASMEA112.18.1/CSA B125.1. Gang showers, whensupplied with a single temperature-controlled watersupply pipe, shall be controlled by a mixing valvethat conforms to ASSE 1069. Handle position stopsshall be provided on such valves and shall beadjusted per the manufacturer’s instructions todeliver a maximum mixed water setting of 120°F(49°C). The water heater thermostat shall not beconsidered a suitable control for meeting this provi-sion.

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Table 4-1

TABLE 4-1Minimum Plumbing Facilities1

Each building shall be provided with sanitary facilities, including provisions for persons with disabilities as prescribed by theDepartment Having Jurisdiction. Table 4-1 applies to new buildings, additions to a building, and changes of occupancy or type inan existing building resulting in increased occupant load. Exception: New cafeterias used only by employees.

The total occupant load shall be determined in accordance with the Building Code. The type of building or occupancy shall bedetermined based on the actual use of the various spaces within the building. Building categories not shown in Table 4-1 shall beconsidered separately by the Authority Having Jurisdiction. The minimum number of fixtures shall be calculated at 50 percent maleand 50 percent female based on the total occupant load.

Once the occupant load and uses are determined, the requirements of Section 412.0 and Table 4-1 shall be applied to determinethe minimum number of plumbing fixtures required.

Type of Building2

or Occupancy

Water Closets14

(Fixtures per Person)

Urinals5, 10

(Fixtures per Person)

Lavatories (Fixtures per Person)

Bathtubs orShowers(Fixtures perPerson)

Drinking3, 13, 17

Fountains(Fixtures perPerson)

Assembly places –theatres, audito-riums, conventionhalls, etc.– forpermanentemployee use

Male Female1: 1-15 1: 1-152: 16-35 3: 16-353: 36-55 4: 36-55Over 55, add 1 fixture for eachadditional 40 persons.

Male0: 1-91: 10-50Add one fixture foreach additional 50males.

Male Female1 per 40 1 per 40

Assembly places –theatres, audito-riums, conventionhalls, etc.– forpublic use

Male Female1: 1-100 3: 1-502: 101-200 4: 51-1003: 201-400 8: 101-200

11: 201-400Over 400, add one fixture foreach additional 500 malesand 1 for each additional 125females.

Male1: 1-1002: 101-2003: 201-4004: 401-600Over 600, add 1 fixturefor each additional 300males.

Male Female1: 1-200 1: 1-2002: 201-400 2: 201-4003: 401-750 3: 401-750Over 750, add onefixture for each addi-tional 500 persons.

1: 1-1502: 151-4003: 401-750Over 750, addone fixture foreach additional500 persons.

Dormitories9–

School or labor16

Male Female1 per 10 1 per 8Add 1 fixture for each addi-tional 25 males (over 10) and1 for each additional 20females (over 8).

Male1 per 25Over 150, add 1 fixturefor each additional 50males.

Male Female1 per 12 1 per 12Over 12, add one fixturefor each additional 20males and 1 for each 15additional females.

1 per 8For females, add1 bathtub per 30.Over 150, add 1bathtub per 20.

1 per 15012

Dormitories – for

staff use16

Male Female1: 1-15 1: 1-152: 16-35 3: 16-353: 36-55 4: 36-55Over 55, add 1 fixture foreach additional 40 persons.

Male1 per 50

Male Female1 per 40 1 per 40 1 per 8

Dwellings4

Single dwelling

Multiple dwelling

or apartment

house16

1 per dwelling

1 per dwelling or apartment

unit

1 per dwelling1 per dwelling or apart-ment unit

1 per dwelling1 per dwelling orapartment unit

Hospital waitingrooms

1 per room 1 per room 1 per 15012

Hospitals – foremployee use

Male Female1: 1-15 1: 1-152: 16-35 3: 16-353: 36-55 4: 36-55Over 55, add 1 fixture foreach additional 40 persons.

Male0: 1-91: 10-50Add one fixture foreach additional 50males.

Male Female1 per 40 1 per 40

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Table 4-1 continuedPLUMBING FIXTURES AND FIXTURE FITTINGS

37

Type of Building2

or Occupancy

Water Closets14

(Fixtures per Person)

Urinals5, 10

(Fixtures per Person)

Lavatories (Fixtures per Person)

Bathtubs orShowers(Fixtures perPerson)

Drinking3, 13, 17

Fountains

(Fixtures perPerson)

HospitalsIndividual roomWard room

1 per room1 per 8 patients

1 per room1 per 10 patients

1 per room1 per 20 patients

1 per 15012

Industrial6 ware-

houses, work-shops, foundries,and similar estab-lishments – foremployee use

Male Female1: 1-10 1: 1-102: 11-25 2: 11-253: 26-50 3: 26-504: 51-75 4: 51-755: 76-100 5: 76-100Over 100, add 1 fixture foreach additional 30 persons.

Up to 100, 1 per 10personsOver 100, 1 per 15

persons7, 8

1 shower foreach 15 personsexposed toexcessive heat orto skin contami-nation withpoisonous,infectious or irri-tating material

1 per 15012

Institutional –other than hospi-tals or penal insti-tutions (on eachoccupied floor)

Male Female1 per 25 1 per 20

Male0: 1-91: 10-50Add one fixture foreach additional 50males.

Male Female1 per 10 1 per 10

1 per 8 1 per 15012

Institutional –other than hospi-tals or penal insti-tutions (on eachoccupied floor) –for employee use

Male Female1: 1-15 1: 1-152: 16-35 3: 16-353: 36-55 4: 36-55Over 55, add 1 fixture foreach additional 40 persons.

Male0: 1-91: 10-50Add one fixture foreach additional 50males.

Male Female1 per 40 1 per 40

1 per 8 1 per 15012

Office or publicbuildings

Male Female1: 1-100 3: 1-502: 101-200 4: 51-1003: 201-400 8: 101-200

11: 201-400Over 400, add one fixturefor each additional 500males and 1 for each addi-tional 150 females.

Male1: 1-1002: 101-2003: 201-4004: 401-600Over 600, add 1fixture for each addi-tional 300 males.

Male Female1: 1-200 1: 1-2002: 201-400 2: 201-4003: 401-750 3: 401-750Over 750, add onefixture for each addi-tional 500 persons.

1 per 15012

Office or publicbuildings – foremployee use

Male Female1: 1-15 1: 1-152: 16-35 3: 16-353: 36-55 4: 36-55Over 55, add 1 fixture foreach additional 40 persons.

Male0: 1-91: 10-50Add one fixture foreach additional 50males.

Female Male1 per 40 1 per 40

Penal institutions– for employeeuse

Male Female1: 1-15 1: 1-152: 16-35 3: 16-353: 36-55 4: 36-55Over 55, add 1 fixture foreach additional 40 persons.

Male0: 1-91: 10-50Add one fixture foreach additional 50males.

Male Female1 per 40 1 per 40

1 per 15012

Penal institutions– for prison useCellExercise room

1 per cell1 per exercise room

Male1 per exercise room

1 per cell1 per exercise room

1 per cell blockfloor1 per exerciseroom

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IDAHO STATE PLUMBING CODE

38

Table 4-1 continued

Type of Building2

or Occupancy

Water Closets14

(Fixtures per Person)

Urinals5, 10

(Fixtures per Person)

Lavatories (Fixtures per Person)

Bathtubs orShowers(Fixtures perPerson)

Drinking3, 13, 17

Fountains

(Fixtures perPerson)

Public or profes-

sional offices15

Same as Office or PublicBuildings for employee

use15

Same as Office orPublic Buildings for

employee use15

Same as Office orPublic Buildings for

employee use15

Same as Officeor Public Build-ings for

employee use15

Restaurants,pubs, and

lounges11,15

Male Female1: 1-50 1: 1-502: 51-150 2: 51-1503: 151-300 4: 151-300Over 300, add 1 fixturefor each additional 200persons.

Male1: 1-150Over 150, add 1fixture for each addi-tional 150 males.

Male Female1: 1-150 1: 1-1502: 151-200 2: 151-2003: 201-400 3: 201-400Over 400, add 1fixture for each addi-tional 400 persons.

Retail or Whole-sale Stores

Male Female1:1-100 1:1-252:101-200 2:26-1003:201-400 4:101-200

6:201-3008: 301-400

Over 400, add one fixturefor each additional 500males and one for each150 females

Male0:0-251:26-1002:101-2003:201-4004:401-600Over 600, add onefixture for each addi-tional 300 males

1 per 2 water closets 0: 1-3017

1:31-150One additionaldrinking foun-tain for each150 personsthereafter

Schools – for staffuseAll schools

Male Female1: 1-15 1: 1-152: 16-35 2: 16-353: 36-55 3: 36-55Over 55, add 1 fixture foreach additional 40persons.

Male1 per 50

Male Female1 per 40 1 per 40

Schools – forstudent useNursery

Male Female1: 1-20 1: 1-202: 21-50 2: 21-50Over 50, add 1 fixture foreach additional 50persons.

Male Female1: 1-25 1: 1-252: 26-50 2: 26-50Over 50, add 1fixture for each addi-tional 50 persons.

1 per 15012

Elementary Male Female1 per 30 1 per 25

Male1 per 75

Male Female1 per 35 1 per 35

1 per 15012

Secondary Male Female1 per 40 1 per 30

Male1 per 35

Male Female1 per 40 1 per 40

1 per 15012

Others (colleges,universities,adult centers,etc.)

Male Female1 per 40 1 per 30

Male1 per 35

Male Female1 per 40 1 per 40

1 per 15012

Worship placeseducational andactivities Unit

Male Female1 per 150 1 per 75

Male1 per 150 1 per 2 water closets

1 per 15012

Worship placesprincipal assemblyplace

Male Female1 per 150 1 per 75

Male1 per 150 1 per 2 water closets

1 per 15012

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1 The figures shown are based upon one (1) fixture being the minimum required for the number of persons indicated or any

fraction thereof.

2 Building categories not shown on this table shall be considered separately by the Authority Having Jurisdiction.

3 Drinking fountains shall not be installed in toilet rooms.

4 Laundry trays. One (1) laundry tray or one (1) automatic washer standpipe for each dwelling unit or one (1) laundry tray or

one (1) automatic washer standpipe, or combination thereof, for each twelve (12) apartments. Kitchen sinks, one (1) for eachdwelling or apartment unit.

5 For each urinal added in excess of the minimum required, one water closet shall be permitted to be deducted. The number of

water closets shall not be reduced to less than two-thirds (2/3) of the minimum requirement.

6 As required by PSAI Z4.1, Sanitation in Places of Employment.

7 Where there is exposure to skin contamination with poisonous, infectious, or irritating materials, provide one (1) lavatory for

each five (5) persons.

8 Twenty-four (24) lineal inches (610 mm) of wash sink or eighteen (18) inches (457 mm) of a circular basin, when provided with

water outlets for such space, shall be considered equivalent to one (1) lavatory.

9 Laundry trays, one (1) for each fifty (50) persons. Service sinks, one (1) for each hundred (100) persons.

10 General. In applying this schedule of facilities, consideration shall be given to the accessibility of the fixtures. Conformity

purely on a numerical basis may not result in an installation suited to the needs of the individual establishment. For example,schools should be provided with toilet facilities on each floor having classrooms.

a. Surrounding materials, wall, and floor space to a point two (2) feet (610 mm) in front of urinal lip and four (4) feet (1,219 mm) above the floor, and not less than two (2) feet (610 mm) to each side of the urinal shall be lined with non-absorbent materials.

b. Trough urinals shall be prohibited.

11 A restaurant is defined as a business that sells food to be consumed on the premises.

a. The number of occupants for a drive-in restaurant shall be considered as equal to the number of parking stalls.b. Hand-washing facilities shall be available in the kitchen for employees.

12 Where food is consumed indoors, water stations shall be permitted to be substituted for drinking fountains. Offices, or public

buildings for use by more than six (6) persons shall have one (1) drinking fountain for the first one-hundred fifty (150) personsand one (1) additional fountain for each three-hundred (300) persons thereafter.

13 There shall be at least one (1) drinking fountain per occupied floor in schools, theatres, auditoriums, dormitories, offices, or

public buildings.

14 The total number of water closets for females shall be equal to the total number of water closets and urinals required for males.

This requirement shall not apply to Retail or Wholesale Stores.

15 For smaller-type Public and Professional Offices such as banks, dental offices, law offices, real estate offices, architectural

offices, engineering offices, and similar uses. A public area in these offices shall use the requirements for Retail or WholesaleStores.

16 Recreation or community room in multiple dwellings or apartment buildings, regardless or their occupant load, shall be

permitted to have separate single-accommodation facilities in common-use areas within tracts or multi-family residentialoccupancies where the use of these areas is limited exclusively to owners, residents, and their guests. Examples are commu-nity recreation or multi-purpose areas in apartments, condos, townhouses, or tracts.

17 A drinking fountain shall not be required in occupancies of 30 or less. When a drinking fountain is not required, then foot-

notes 3, 12, and 13 are not applicable.

PLUMBING FIXTURES AND FIXTURE FITTINGS Table 4-1 continued

39

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IDAHO STATE PLUMBING CODE

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