How The Blueprints Of Your House Dictate The Placement And Installation Of Your Plumbing

Posted on: 1 December 2019

Looking at the blueprints of the home you want to build, all you might see are the rooms and the floor plans of the house. What contractors see is something entirely different. The blueprints of your house tell them all kinds of things, including where your plumbing is going and how the layout of the plumbing will go. Here is how the blueprints dictate the placement and installation of your plumbing:

Sinks, Toilets, Showers, Tubs, and Laundry Hookups

On your blueprints, there are symbols showing where your toilets, sinks, showers/tubs, and laundry hookups are located (if you have first floor laundry). Under each of these symbols your plumbing contractor knows that he/she is installing a sewer stack for the toilets and pipes and drains for the sinks, tubs, and showers. The pipes for laundry involve two pipes for hot and cold water taps, and a dirty or "gray" water return pipe that connects to the main sewer stack. After installing all of the pipes and sewer stacks just below these fixtures in bathrooms and the kitchen (and laundry room, if separate and applicable), the rest of the plumbing runs to and from underneath the floors. 

All Plumbing Leads to the Main Sewer Line or Water Main

Well, all the plumbing that involves water and wastewater runs to the main sewer line anyway. There is additional plumbing required for gas lines and electrical conduits, but the majority of the actual water plumbing is the focus here. Additional pipes are connected to all of the fixtures in the home, and then these pipes eventually converge before entering the main sewer line.

Only the pipes that bring clean water to your taps do not converge with the rest of the lines. Dozens of pipes loop back and forth under your home's floors to connect to the water main for clean water, and the main sewer line that empties into the city sewer or your septic system. Looking at the blueprints, the plumber gets a really good idea of how the pipes are going to loop to the main sewer or the water main in your home. 

Outgoing Pipes Are Installed Before Incoming Pipes Are Installed

The plumber will install all of the sewer draining pipes before installing all of the water main pipes. That is because the sewer pipes and fixture drains need to drain during testing of the plumbing, and they cannot drain if there is nowhere for the water to go. Your fixtures will all be connected to "outgoing" sewer pipes before the "incoming" water pipes are connected.