Plumbing Riser Diagram
I've been a master plumber since 1981 and I love to draw these 3D drawings. I can get yours done in a day or less should you be in a rush to get your permit.
What is a Residential Plumbing Riser Diagram?
A residential plumbing riser diagram shows plumbing drain, waste, and vent lines, how they interconnect, and it includes the actual pipe sizes. Building inspectors and plumbing inspectors require the drawing to save you time and money. They want to make sure you understand what size drain pipe to extend to each fixture and they want to make sure you know how to vent all the fixtures. All of this is shown using plumbing riser diagram symbols.
What is a Riser in Plumbing?
A riser is just another name for a vertical stack or pipe in a plumbing system. Just as smoke travels up a smoke stack, water comes down a plumbing stack. A riser can be any vertical pipe in a building that goes from one floor to another. Vent pipes can also be riser pipes. You can see why the plumbing riser definition makes sense when you think about it in relationship to other stacks in buildings and factories.
What is a Typical Plumbing Riser Diagram?
Each drawing or diagram is different unless the houses are carbon copies of one another. The riser diagram takes into account the exact position of the fixtures relative to one another. Here's an example:
Do You Show a Plumbing Riser Clamp in the Drawing?
No, you don't show these clamps in a normal riser diagram. Here's what a riser clamp looks like:
Do All Fittings Show in a Riser Diagram?
Most residential riser diagrams do not show each and every fitting you need to install the piping. The primary purpose of the drawing is to communicate that you know what size drain pipe needs to extend to each fixture as well as what size vent pipe must service the fixture. How you get the pipes from point A to point B according to the plumbing code is up to you. It's best that you do it with as few bends as possible to prevent clogs.