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Building A Home? Guide To The Plumbing Rough-In Process

Fixing a sink
Even though there are many homes for sale on the market, building a home from the ground up allows you to create the home you want and need in a location you choose. Unfortunately, the process of building your home can be stressful and overwhelming. In addition, the new-home construction process is very time-consuming, taking around seven months to complete.

In the early stages of construction, your home will need to go through the rough-in phases. From electrical and HVAC to plumbing, roughing in ensures the home is ready for its underlying systems before the drywall and finishing touches are completed. This guide will help you understand the process of roughing-in your new home's plumbing.

The 411 on the Rough-In

Once the home is framed, plumbers will begin the rough-in process. Because there are no walls or floors in the home during this period of time, running water lines and drain pipes is a lot easier.

The rough-in should be completed before the initial inspections. In most cases, the plumbing rough-in occurs around the same time as the electrical and HVAC rough-in process. Once the inspectors approve the rough-in for plumbing, electrical, and HVAC, the construction on the home can continue.

If the inspectors do not approve the plumbing, no permit will be issued. The work must be corrected before inspected a second time. Trusting the right plumbing contractors will ensure your rough-in is completed and approved efficiently.

The Plumbing Rough-In Process

There are multiple steps involved in the rough-in process for your plumbing.

To get started, your contractor will draw up a diagram to help determine the location of each plumbing fixture, the main water hookup, and the pipes needed to connect the water and drain lines.

It is also helpful to walk the framed home with the plumber and builder to confirm the location of your sinks, toilets, tubs, shower, water heater, and washer/dryer hookups. The early part of the rough-in also allows you to determine the location of your spigots and faucets on the exterior of your home.

Holes are cut into the framed parts of the home to accommodate the openings for the fixtures, underlying water lines, and drain pipes.

Wastewater drain lines are usually installed first. Gravity is essential for draining, so these pipes must be installed in a position that angles downward.

If not angled properly, water and waste will not drain out efficiently. If the wastewater drain lines are sloped too much, water will drain too quickly, leaving behind waste and increasing your risk of clogs. Most plumbing codes require a slope of at least ΒΌ inch per each horizontal foot of pip

The wastewater system must also be vented to ensure waste is removed from the home efficiently and safely. The wastewater drain lines are installed in an upward position through the roof to promote proper venting. 

After installing and connecting the wastewater drain lines, the supply lines will be installed. Plumbers will connect PVC or copper water lines from the exterior water lines to various locations in the home. These water lines will supply the water needed for your faucets, showers, toilets, dishwasher, washing machine, and water heater.

Toward the end of the rough-in process, the pipes are capped and tested to determine if there are any leaks to address and correct before the inspection.

Again, once the inspection passes, the remaining parts of the plumbing system can be installed later in the construction process.

Building your home is not meant to be easy, but utilizing experienced and knowledgeable plumbers can help. To learn more about plumbing for your new construction home, contact AERO Plumbing today.

Serving Richland, Lexington, Kershaw and Fairfield Counties


East Columbia

St. Andrews

Cola NE & Blythewood

Cola & Lexington


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