FL Fixture Unit Load Calculator | Pipe Sizing FPC §604 §702

💧Water Supply Fixture Units (WSFU)

Enter the quantity of each fixture. WSFU values per FPC 2023 Table 604.3. The calculator totals WSFUs and recommends minimum supply pipe sizes per FPC §604.

Building type

Fixture WSFU Qty

Total WSFU 0

📊WSFU Reference — FPC Table 604.3

Fixture	Private (WSFU)	Public (WSFU)
Toilet (flush tank)	2.5	5.0
Toilet (flushometer)	6.0	10.0
Lavatory / bathroom sink	1.0	2.0
Bathtub (with shower)	2.0	4.0
Shower stall	2.0	4.0
Kitchen sink	1.5	3.0
Dishwasher (domestic)	1.5	—
Laundry tray	1.5	3.0
Washing machine	3.0	—
Hose bib (sillcock)	2.5	5.0
Urinal (flush tank)	—	3.0
Service sink	3.0	3.0
Bar sink	1.0	2.0
Ice maker	0.5	1.0
Water softener	1.0	—

📏Supply Pipe Sizing — FPC Table 604.4

Total WSFU	Min Pipe Size	Typical Use
Up to 3	1/2 inch	Single fixture branch
4–6	3/4 inch	Small bath group
7–15	3/4 inch	Small residence
16–30	1 inch	Medium home
31–60	1-1/4 inch	Large home / small commercial
61–100	1-1/2 inch	Multi-bath commercial
101–180	2 inch	Medium commercial
181–300	2-1/2 inch	Large commercial
301+	3 inch +	Large commercial / multi-family

FL note: Water pressure in FL averages 65–75 PSI at the meter. Homes with PRV (Pressure Reducing Valve) at 70–80 PSI: use standard table values. Homes with street pressure under 50 PSI (common in older South FL neighborhoods): pipe one size up from table minimum to compensate for pressure loss at peak demand.

🚿Drain-Waste-Vent Fixture Units (DFU)

Enter fixture quantities. DFU values per FPC 2023 Table 702.1. The calculator totals DFUs and recommends drain, stack, and vent pipe sizes per FPC §702 and §906.

Fixture DFU Qty

Total DFU 0

Installation type Slope (horizontal drains only)

📊DFU Reference — FPC Table 702.1

Fixture	DFU Value	Trap Size
Toilet	4	3"
Lavatory / sink	1	1-1/4"
Bathtub	2	1-1/2"
Shower stall	2	2"
Kitchen sink	2	1-1/2"
Dishwasher	2	(connects to KS)
Washing machine	3	2"
Laundry tray	2	1-1/2"
Floor drain	2	2"
Urinal (wall hung)	4	2"
Service sink	3	3"
Bar / prep sink	1	1-1/2"
Roof drain	Per GPM	—

📏Drain Pipe Sizing — FPC Table 702.3

Horizontal Branch Drains (1/4" per foot slope)

Pipe Size	Max DFU (Horiz)	Max DFU (Stack)	Max DFU (Building)
1-1/4"	1	2	—
1-1/2"	3	4	—
2"	6	10	—
2-1/2"	12	20	—
3"	20	48	36
4"	160	240	216
5"	360	540	480
6"	620	960	840

Vent Pipe Sizing — FPC Table 906.1

Drain Pipe Size	Min Vent Size	Max Vent Length
1-1/4"	1-1/4"	45 ft
1-1/2"	1-1/4"	60 ft
2"	1-1/2"	120 ft
3"	2"	180 ft
4"	3"	212 ft
6"	4"	300 ft

FL slab homes note: Most FL homes are slab-on-grade — DWV under-slab runs are cast before the pour and cannot be easily changed after construction. When sizing drain lines for a FL renovation, verify the existing under-slab drain sizes before adding fixtures. Adding a bathroom to a FL slab home is a significant job because the slab must be saw-cut and broken to run new drains.

📜FPC 2023 — Key Sizing Code Sections

Section	Topic	Key Rule
§604.1	Supply sizing general	Size all supply pipe per WSFU Table 604.3 for velocity max 8 ft/sec
§604.3	Fixture unit table	WSFU values by fixture type and private vs public use
§604.4	Supply pipe sizing table	Pipe diameter by total WSFU demand
§604.6	Velocity limits	Max 8 ft/sec in supply; max 4 ft/sec at final branch
§604.8	Pipe support	Copper horizontal: 6 ft max; vertical: 10 ft max
§701.1	DWV general	All drainage by gravity unless approved ejector
§702.1	DFU fixture table	Fixture unit values by fixture type
§702.3	Drain pipe sizing	Pipe diameter by DFU for horizontal, vertical, and building drains
§706.3	Drain slope	Min 1/4" per foot for 3" and smaller; 1/8" acceptable for 4"+ with approval
§708.1	Cleanout access	Required at base of each stack and each 100 ft of horizontal drain
§906.1	Vent pipe sizing	Min vent by drain served; max vent length table per §906
§912.1	Wet venting	Permitted in residential — limits on fixture type and count

⚠️Most Common FL Pipe Sizing Violations

❌ 3/4" supply main to full house: Many 1970s–1990s FL homes have undersized 3/4" copper mains. Acceptable then, but adding fixtures now triggers sizing upgrades per FPC.

❌ S-traps: Widely used before 1990 in FL, S-traps are prohibited. Self-siphon risk. Inspector will flag during any WH or repipe permit.

❌ 2" drain for 3 toilets: Each toilet is 4 DFUs; a 2" horizontal drain maxes at 6 DFUs. Three toilets (12 DFUs) require a 4" drain — very common miscalculation in FL additions.

❌ No cleanout at stack base: FPC §708 requires a cleanout at the base of each stack within 2 feet of where it changes from vertical to horizontal. Often missing in FL homes where the stack base is under the slab.

❌ ABS pipe: ABS is prohibited in Florida — PVC Schedule 40 or DWV is required. ABS is legal in other states but FL inspectors will reject it.

❌ Vent too small or missing: Each fixture branch must be properly vented. In FL slab homes, venting is often inadequate because adding vents requires going through the slab. Wet venting per §912 offers a workaround.

🏛️Commercial — County-Specific Notes

County	Commercial Notes
Miami-Dade	Requires structural engineer-stamped plans for commercial plumbing over $25K; separate MEP review from building structural; water department approval for mains >2"
Broward	Fire suppression and plumbing must be submitted together for new construction; grease interceptor sizing requires Health Dept sign-off for food service
Hillsborough	Tampa Water Dept approval required for backflow on commercial mains; permits issued through HCBCC building portal; plan review 10–14 days standard
Orange	Orange County requires separate plumbing plan submittal for commercial; OC Utilities must approve tap for new water service above 1"
Palm Beach	Commercial WH and supply pipe require licensed Mechanical and Plumbing Engineer of Record stamp for new buildings

🏠Typical FL Residential Fixture Unit Loads

Home Type	Typical WSFUs	Typical DFUs	Min Supply Main
2BR/1BA condo	12–16	14–18	3/4"
3BR/2BA single family	20–28	22–32	1"
4BR/3BA single family	28–40	30–45	1–1-1/4"
5BR/4BA large home	40–60	45–65	1-1/4–1-1/2"
Duplex (each unit)	20–30	22–35	1" per unit
Small commercial (1 restroom)	20–35	25–40	1–1-1/4"

📞Get a Free Pipe Sizing Consultation

Adding fixtures? Building an addition? Our licensed CFC plumbers will size your supply and DWV system per FPC 2023, pull the permit, and handle all inspections.

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✅What Our Sizing Review Covers

✅ Total WSFU and DFU calculation per your fixture list
✅ Supply main and branch sizing per FPC §604
✅ DWV drain, stack, and vent sizing per FPC §702 + §906
✅ Existing system review — is current pipe undersized?
✅ Slab penetration plan (FL slab-on-grade homes)
✅ PRV sizing and pressure loss analysis
✅ Permit drawings and plan submittal
✅ County-specific commercial MEP coordination

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