# Performance Specification Gap in Division 22 Plumbing submittals

> Source: https://deviationcheck.com/divisions/22-plumbing/performance-specification-gap/

A measurable performance property in the submittal (rating, capacity, tolerance, efficiency) does not meet what the spec requires.

## What to look for in Division 22 Plumbing

Key performance parameters in plumbing submittals:
- **Pipe pressure rating** (SDR rating, schedule number, psi working pressure)
- **Pipe material specification** (Type L vs Type M copper, Schedule 40 vs 80 steel/PVC, CPVC, PEX class)
- **Flow rate (GPM)** at design conditions for water heaters and fixtures
- **Temperature rise** (degrees F at rated flow for water heaters)
- **Thermal efficiency** (%) for water heaters (condensing vs non-condensing)
- **First-hour rating** and recovery rate (GPH) for storage water heaters
- **Input capacity** (BTU/hr for gas, kW for electric water heaters)
- **Storage capacity** (gallons)
- **Fixture water consumption** (GPF for water closets and urinals per EPA WaterSense, GPM for lavatory faucets and showerheads)
- **Backflow preventer rating** (ASSE 1012, 1013, 1015, 1024 per hazard classification)
- **Grease interceptor capacity** (GPM flow rate, grease retention in lbs)
- **Roof drain flow capacity** (GPM at design head)
- **Expansion tank volume** (gallons, acceptance volume at operating pressure)
- **Insulation thickness** for hot water piping (per ASHRAE 90.1 Table 6.8.3)
- **Pipe velocity limits** (fps for copper, steel, plastic per manufacturer/code)

## Severity

Default grade: Blocker. Always a Blocker when the gap touches life-safety or structural performance.