The residential inspection checklist for underfloor (water service) includes:

• An accessible customer shutoff valve (boxed with lid) within 18 inches and downstream of the water meter.
• Proper water service pipe sizing for required flow rate/flow pressure, section P2903.1, and Table P2903.1, I.R.C.
• Materials, joints and connections, section P2905, I.R.C.
• Trenching, pipe installation and backfill, sections P2905.4.2 and P2604, I.R.C.
• Piping support, sections P2907 and P2605.1, I.R.C. ***Please Note: Copper piping may not be laid directly and compacted into the 4-inch-thick (ABC) base course.
• If installed in the same trench as the sewer piping, water service piping must be on a solid ledge, at least 12 inches above and to one side of the highest point in the sewer line (City standard).
• Water service pipe cross-over, min. 10 foot water service pipe sleeve (min. 5 foot horizontal sleeve length from cross-over centerline of sewer pipe, measured from both sides), section P2905.4.2, I.R.C.
• No bends in polyethylene plastic piping are permitted within 10 pipe diameters of any fitting or valves, section P2905.3, I.R.C.
• Tested operating water pressure at minimum 40 psi air pressure for minimum 15 minutes, section P2903.3, I.R.C. ***Please note: When the main pressure exceeds 80 psi, an approved pressure-reducing valve conforming to ASSE 1003 or CSA B356 shall be installed on the domestic water branch main or riser at the connection to the water-service pipe, section P2903.3.1, I.R.C.
• Pressure regulators required if over 80 psi (City standard).