Which pipe is right for Florida? Compare corrosion resistance, lifespan, cost, and slab leak risk for FL's harsh water and soil conditions.
FL Corrosion Data • Slab Leak Risk • Cost Calculator*In FL specifically: formicary corrosion (from organic compounds + humidity), dezincification from chloramine-treated water, and aggressive coastal soil chemistry dramatically reduce copper lifespan vs. national averages. Type L copper (thicker wall) outperforms Type M in FL corrosive environments. Most FL slab leaks occur in Type M or Type K copper embedded in slabs built 1970-1995. FL incoming water temp 70-80F (vs. 40-55F nationally) accelerates corrosion chemistry 3-5x. Still a premium choice for above-slab accessible applications. Not recommended for new under-slab installation in FL.
PEX is now the preferred choice for FL whole-home repiping and new construction supply lines. Immune to formicary corrosion, dezincification, and FL acidic soil chemistry. Flexible enough to snake through walls without joints. Expands slightly under freezing (FL freeze events), resisting burst. FL considerations: PEX degrades with prolonged UV exposure — use only in enclosed or protected applications (no outdoor exposed runs). PEX-A (Uponor/Wirsbo) outperforms PEX-B/C in FL due to shape-memory property. Brass expansion fittings preferred in FL hard water — wider bore resists calcium scale better. FL plumbing code (FBC 2020) allows PEX for all residential supply applications.
CPVC was the primary alternative to copper in FL homes 1985-2010. Solvent-welded joints provide root-resistant connections. Good chlorine/chloramine resistance. FL-specific issues: CPVC becomes brittle as it ages — especially after 25+ years of FL UV exposure in attic runs. Thermal expansion in FL attic temperatures (130-160F in summer) causes CPVC to sag between hangers, requiring more frequent support than copper. Incompatible with certain pesticide formulations (Chlordane, some termiticides) — causes chemical stress cracking. Check if your FL home has had termite treatment before disturbing CPVC in slab penetrations. CPVC joints cannot be undone once set — misalignment requires cutting and coupling.
| Factor | Copper | PEX-A | CPVC |
|---|---|---|---|
| FL slab install | Not recommended | Preferred | OK |
| Repipe cost/LF | $8-$15 | $3-$7 | $4-$9 |
| Formicary corrosion | Susceptible | Immune | Immune |
| FL hard water scale | Moderate | Low | Low |
| FL attic heat | Excellent | Good (insulate) | Good |
| Freeze resistance | Bursts | Expands safely | Cracks |
| FBC 2020 approved | Yes | Yes | Yes |
FL water sources: (1) Surficial Aquifer — shallow wells, typically acidic (pH 5.5-7.0), low hardness, higher dissolved CO2. Aggressive to copper. (2) Floridan Aquifer System — deeper wells and most municipal supplies, typically hard (GPG 10-30+), slightly alkaline (pH 7.2-8.0), high calcium/magnesium. Scale-building but less corrosive to copper. (3) Surface water sources treated with chloramine in most large FL utilities (Miami-Dade, Tampa, Orlando). Chloramine is more corrosive to copper than free chlorine at FL water temperatures. Key finding: PEX interacts minimally with any FL water chemistry. Copper under slab in FL municipal chloramine service areas has highest failure rate.
FL-licensed plumbers specializing in PEX and CPVC repiping for FL slab homes. Free repipe assessments available in most counties.