How To Draw Riser Diagram
" ...you need to have a deep understanding of plumbing waste and vent systems to be able to draw one correctly."
How To Draw Riser Diagram - Not Too Easy, Sorry!
You want to know how to draw a riser diagram. I get it. You need to pull your permit and you're stuck.
You've seen the diagrams and feel you can draw the lines and magic happens.
The trouble is you need to have a deep understanding of plumbing waste and vent systems to be able to draw a riser diagram correctly to be able to GET A PERMIT.
If you take a piece-of-crap drawing into the building and plumbing department, they'll probably show you the door.
Even if you don't have to use the drawing to get a permit, you still might draw a few of the pipe connections wrong. If you put the wrong pipe fittings in, your system could experience chronic clogging.
In other words, drawing a riser diagram is not something I can teach you in a 300-word column. However, you may be able to watch the following video and start to gain some confidence.
Basics Needed To Draw A Riser Diagram
Here's what you need to draw a correct riser diagram:
- 30/60/90 triangle
- fixture unit table
- pipe size table
- knowledge of dry and wet vents
- knowledge of illegal fittings under slabs
- knowledge of best plumbing practices opens in a new window(CLICK HERE to download)
The plastic triangle allows you to draw the proper lines in a 3D format so it's easy for someone to visualize the true relationship of the pipes once they're installed. Here's a typical photo of pipes going in and you need to be able to represent this on paper with just lines:
Solid and Dashed Lines in Riser Diagrams
You'll notice both solid and dashed lines in the riser diagrams on this page. The solid lines carry liquid and solid waste and the dashed lines are designed to only contain air.
However, the dashed vent lines do carry liquid in the form of condensate so they need to be installed so they drain by gravity.
The trouble for a rookie like you is that some solid lines in riser diagrams can also be approved vent lines too.
See how you need to be a master plumber to understand what's going on? The diagram below has a short section of this hybrid waste/vent line. See if you can identify it.
I'm A Master Plumber Who Draws For People
I've drawn many many riser diagrams. I'll never forget the day I sat for my master plumber's exam.
We had to draw a riser diagram for a multi-story building that had all sorts of crazy fixtures in it. I loved making these diagrams.
Two weeks after the exam the head of the plumbing department called me to tell me I was the only person to ever get the entire drawing correct. I found that very hard to believe because I knew many many intelligent plumbers in my city that sat for the same exam.
It's important to realize I now draw them for homeowners like you all over the USA. opens in a new windowClick here to hire me.
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