Definition
Plumbing rough-in installs supply lines, drain lines, and vent pipes within walls before drywall. Code requires specific slopes for drain lines and adequate support. Rough-in inspection verifies proper sizing, slopes, venting, and materials.
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Plumbing rough-in includes installing water supply piping (copper, PEX, PVC), drain and vent lines (ABS or PVC), and gas lines where applicable. Rough-in layout is determined by fixture locations. Code requires specific slope for drain lines, support for all pipes, and adequate clearance. Rough-in inspection verifies proper sizing, slopes, venting, and material usage. Plumbing rough-in must be completed before drywall to allow inspection.
Pro Tip
PEX plumbing is faster and more flexible than copper. Verify proper support and protection from puncture during rough-in.
Example
Plumbing rough-in installs PEX supply lines to each fixture location, 3-inch drain lines for toilets, 2-inch drain lines for sinks/tubs, and proper vent stacks.