FL plumbers use ABS or Schedule 40 PVC drain lines. Minimum 3" for toilets, 1.5"–2" for sinks and tubs. Code requires a minimum slope of ¼" per linear foot toward the main stack. PVC is preferred in FL for its excellent corrosion resistance in humid, mineral-rich water conditions. All joints must be solvent-welded and air-tested before inspection. Cleanout access required per FL Building Code.

PEX-A tubing is strongly recommended in FL. More flexible than copper, handles occasional freeze events in North FL, and resists corrosion from FL's hard, mineral-heavy water. Standard sizing: ½" to fixtures, ¾" main trunk lines. Color-coded per code: red = hot, blue = cold. Manifold systems allow per-fixture isolation without cutting walls — ideal for hurricane prep and leak management.

FL Building Code requires all fixtures to be properly vented to prevent trap siphoning and sewer gas infiltration. Air Admittance Valves (AAVs) are permitted in FL for certain applications where roof penetration is impractical. Primary vents must extend through the roof with proper flashing — critical in FL's high-rainfall climate. Typical 2"–3" PVC vent stack connection at the main soil stack.

Florida Building Code requires individual quarter-turn ball valves at every fixture (toilet, sink, shower supply lines). Ball valves are preferred over gate valves — they seal completely and don't corrode internally over time. Essential for hurricane prep: you can isolate individual fixtures without shutting off the whole house. Standard installations include angle stops at toilet and vanity, inline shutoffs for shower supplies.

Florida Building Code (2017+) mandates pressure-balancing or thermostatic mixing valves in all showers and tub/shower combinations. Must maintain set temperature within ±3°F when demand fluctuates. Prevents dangerous scalding when a toilet flushes mid-shower. Adds $150–$400 to shower valve line item. Thermostatic valves cost more but allow precise preset temperature controls — highly recommended for master baths.