What is Plumbing Top Out?

The plumbing top out phase occurs during the frame stage of new construction projects and involves installing aboveground plumbing networks into walls, floors and through roof voids for use later. Prior to covering them with wall board.

After the underground rough-in has taken place and before foundation is laid down, plumbing top out ensures all supply and drainpipe connections are made properly in the house’s frame.

Vent Pipes

Vent pipes are essential in ensuring the proper operation of any plumbing system. Without them, drains could experience issues like making an audible gurgling sound when flushing or using sink or toilet and having difficulty discharging waste water and air from their pipes. This results in air becoming trapped inside them which in turn leads to wastewater building up in them, creating blockages which prevent it from leaving safely through vent pipes.

Vent pipes are an integral component of any plumbing system as they allow air to replace wastewater when using fixtures, which would otherwise accumulate and lead to blockages in your plumbing pipes. Furthermore, they prevent vermin or sewer gas entering your home or business and prevent vermin entering through open vents in walls or crawlspaces.

Your plumber will install the pipes during the plumbing top out phase, in which he or she lays out an above-ground piping network in walls and ceilings before covering them with drywall. This includes running vent stacks to the roof as well as connecting them to drain lines and water supply lines.

Each fixture will usually have one vent pipe connected to its respective p-trap, from which waste and fresh air travel down drain lines into either your septic or city sewer line. A plumbing vent pipe allows air to escape via these drain lines to prevent pressure buildup within your drainage system and prevent pressure buildup; additionally, fresh air also prevents odors or any other issues in the future.

Water Lines

Your plumbing system’s water lines are responsible for transporting fresh, clean water from the main to your toilets, showers, sinks and appliances. If these lines are missized it could cause multiple issues: for instance undersized lines may limit flow into fixtures which reduces pressure; undersized water lines could also result in banging noises in pipes caused by water hammer; while oversized waterlines waste both energy and water.

Understanding your home’s plumbing is vitally important if you want to recognize when there is an issue or potential trouble, including being aware of the difference between a sewer line and waterline as well as their interactions with appliances in your home. It is also crucial that you understand their interplay.

The plumbing rough in phase is an integral component of new construction plumbing. A plumber installs pipes within walls and floors, runs vent stacks up onto roofs, connects drain and water supply lines with sewer systems or septic tanks, connect drain lines to sewer systems or septic tanks and connect drain lines and supply lines from there to drain lines or water supply lines which lead to sinks, faucets or fixtures (though an inspection still must occur to ensure code adherence), connect drain lines to sewer systems or septic tanks and connect drain lines from there to sewer or septic tanks – this stage does not involve sinks, faucets or any fixtures being installed – while afterwards comes top out plumbing where all ground plumbing comes up through vents into your system while simultaneously installing fixtures from below the ground as part of top out plumbing (through vents), as well as connecting drain lines from above ground through vents before connecting drain lines or supply lines that go underground bringing ground plumbing up through vents for installation). Once this phase of plumbing is completed then comes top out where ground plumbing comes up through vents into your house before finally installing fixtures from below ground through vents to complete.

Waste Lines

Plumbing top out refers to the installation of the above ground portion of a new home or commercial building’s drainage system – also known as “drain-waste-vent”, or DWV. Here, plumbers connect supply and waste pipes before pouring foundation.

Basically, this involves connecting the main drain line from your house to either the city connection or septic tank and having all fixture drains connect into this main line. Furthermore, having one with a cleanout – an access point on which you can gain entry in case of a serious blockage – is important.

Your house’s waste lines connect to each fixture through a drain trap, which holds standing water to prevent sewer gases from rising up through your drain pipe and into your home. Therefore, it is imperative that your plumber utilize PVC or black ABS pipe with no 90 degree bends for optimal performance.

Wastewater from traps flows down horizontal pipes known as branch drain lines, where it continues its journey into your toilets and other drains. If these branches don’t have sufficient diameter to accommodate all the materials that go down them, they could clog easily; 1 1/4 to 2 inches would be an appropriate diameter range.


Plumbing fixtures are devices used to deliver water and drain away waste through plumbing systems, such as toilets, bathtubs, showerheads and sinks. Fixtures play an essential role in providing clean water and waste disposal in homes and buildings alike – providing clean drinking water and managing waste effectively is critical for good health and hygiene practices in any space. They come in various styles and designs that complement any aesthetic space perfectly.

A typical plumbing fixture typically consists of one or more water outlets, a drain, and vent pipe. Some drains feature an adjustable shut-off valve to stop the flow of water and avoid floods; most also come equipped with an indicator which indicates when overflow may occur. Furthermore, fixtures typically supply their water source using cold water supplies.

Although multiple fixtures can share one vent stack, more than three or four shouldn’t connect in order to avoid overflowing the drain or overloading it with wastewater.

When it comes to plumbing top outs, it is essential that experienced plumbers are used. This ensures the pipes are installed according to Sacramento plumbing code, while getting regular checks done to make sure all plumbing fixtures work as intended.