INDOOR PLUMBING
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Great plumbing is entirely invisible. No drips. No slow drains. No gurgling vents. No cold spots on bathroom floors where a drain line runs too close to an exterior wall. RainFire Builders’ licensed plumbers design and install complete indoor plumbing systems — from below-slab drain rough-in through finish fixture setting — with the precision and code knowledge that prevent every problem you should never have to think about.
WATER WHERE YOU NEED IT
What Indoor Plumbing Actually Involves?
Indoor plumbing encompasses three distinct systems that work together invisibly inside your walls, floors, and ceilings — supply, drain-waste-vent, and gas. Each system has its own pipe materials, sizing requirements, slope criteria, inspection protocols, and failure modes. Understanding the difference between a supply leak and a drain issue is the first step toward getting the right fix and getting the right installation the first time.
Rough-in plumbing is the foundation — the hidden work run through framing before walls are closed that must be inspected and approved before drywall can begin. Getting drain locations right at rough-in determines whether every fixture in the finished home sits correctly, drains correctly, and vents correctly. Moving a toilet drain two inches after tile is set costs thousands. Getting it right at rough-in costs nothing extra.
Finish plumbing — trim-out — is what makes the invisible infrastructure visible: the faucet handles, the showerhead, the toilet, the sink drain. Finish plumbing quality determines what the homeowner sees and touches every day, and how long it lasts without leaks or failure.
RainFire Builders’ plumbers are licensed in Utah, familiar with the Uniform Plumbing Code as adopted statewide, and experienced with the specific hard water and freeze-risk conditions that Utah plumbing must address.
Phase 1 – Rough-in
All pipe runs, drain locations, supply stubs, and vent connections are installed inside framing before drywall. Must pass city rough-in inspection (including a pressure test of supply lines) before walls are closed. This is where all critical decisions are locked in.
Phase 2 – Finish / Trim-out
After all surfaces (tile, drywall, flooring) are complete: toilets are set, faucets are installed, showers are connected, dishwashers are hooked up, and all supply and drain connections are made and tested. This is what the homeowner sees every day.
The Rule: Never Close Before Inspection
RainFire Builders never installs drywall over unfinished or uninspected plumbing rough-in. Every rough-in is inspected and approved before the wall closes — a standard that prevents the most expensive plumbing problem in residential construction: the leak discovered behind finished walls.
OUR INDOOR PLUMBING SERVICES
RainFire Builders’ licensed plumbers handle the complete indoor plumbing scope — from the first below-slab drain line to the final faucet connection — as a coordinated part of the interior construction sequence.
The RAINFIRE PLUMBING PROCESS
Plumbing is one of the most sequence-sensitive trades in a building. Get the sequence wrong and you’re cutting into finished tile to fix a drain that could have been set correctly in thirty minutes before the slab was poured.
For slab-on-grade construction, all below-slab drain lines are the first plumbing work on site — before the slab is poured, before framing begins. Drain locations are set from the approved architectural plans and verified against fixture manufacturer rough-in dimensions. Every toilet flange, shower drain, and floor drain is set at the correct elevation for the finished floor assembly. This is the only point in the entire project where drain location errors cost nothing to fix. RainFire Builders takes the time to verify every location before concrete is poured.
After framing, all above-slab drain lines, vent stacks, and branch vents are installed. Branch drain lines are sloped at a minimum of 1/4 inch per foot for 3-inch and smaller pipe, and 1/8 inch per foot for 4-inch and larger, per UPC requirements. Each fixture connection is individually vented or connected to a wet vent within the code-required trap-to-vent distance. All penetrations through the top and bottom plates are fireblocked. The DWV system is tested — either by capping all openings and filling the system with water, or with an air test per jurisdiction requirements — before the rough-in inspection is called.
PEX-A supply lines are run from the main distribution manifold (or series-fed from the meter) to each fixture location — hot on the left, cold on the right, as viewed facing the fixture. Supply lines in exterior walls are run on the interior (warm) side of the insulation to minimize freeze risk. All stub-outs are set at the correct rough-in height and protected with escutcheons or stub-out plates. Individual shutoff valves are confirmed in the rough-in plan for all fixture locations. Supply lines are pressure-tested at 150 psi for a minimum of 15 minutes before calling for inspection — RainFire Builders pressure-tests longer, and in Utah’s winter, tests with the building heated to ensure no temperature-related pressure drop confuse the reading.
With both DWV and supply rough-in complete and tested, RainFire Builders calls for the city rough-in plumbing inspection. The inspector verifies pipe sizing, venting, slope, and pressure test. After inspection approval, the walls can be insulated and closed with drywall. This sequence is non-negotiable — plumbing rough-in inspection approval precedes drywall on every RainFire Builders project. There are no exceptions made for schedule pressure, and no walls closed based on “we’ll get the inspection after.” The inspection is what authorizes closing the wall.
After all surfaces — tile, drywall, and paint — are complete and flooring is installed, RainFire Builders’ plumbers return for trim-out. Toilets are set with new wax rings to the correct finish floor height. Faucets are installed with escutcheons covering wall penetrations cleanly. Shower valves receive trim kits and showerheads. Supply stops are connected, tested, and confirmed drip-free. Dishwasher and disposal connections are made. The water heater is connected and commissioned, with the temperature set to 120°F standard (140°F where required for legionella control). Every water-using fixture is run and confirmed operational before trim-out is considered complete.
