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| Rough in Plumbing Diagram (Bathroom Plumbing diagram).... |
Lets take a look at this isometric drawing of basic bathroom plumbing installation!
What is an Isometric Drawing ?
An isometric plumbing diagram is a 3D view of the entire plumbing Drain, Waste and Vent system (DWV). The piping, connections, fixture trap and sizes would be the only thing visible. In this section we will be focusing primarily on "A Basic Rough in Plumbing Diagram" (Plumbing Isometric Drawing).
A plumbing diagram is a really useful tool that can save you lots of money and headaches. The drawing communicates to the plumbing inspector that your system will meet the
minimum standards of the Uniform Plumbing Code. By having an isometric drawing of your new plumbing installation, an inspector can study your rough-in plumbing diagram making sure the correct pipe sizes and correct fittings are used to complete the plumbing job.
Let's say that you have drawn a basic bathroom isometric and the fiitings that will be used exceeds the degree's alotted in a plumbing system. Note: this plumbing installation will be slab on grade. The inspector would note to you that the plumbing drawing will have to be revised and show a clean out after exceeding the 135 degrees. You would re-draw the rough in plumbing diagram adding the clean out. This just saved you time, money, and complete aggravation before you install the piping and have to rip it out to add the necessary fitting (clean out).
The Plumbing diagram should be of only the "NEW" plumbing that is to be installed. If you are installing a new bathroom, re-modeling a bathroom or adding a fixture to the
bathroom then only the bathroom isometric diagram will be needed.
The diagram will have to include a bathroom plumbing vent diagram. Vent pipes on plumbing diagrams are drawn as dashed lines. This portion of the plumbing diagram will show how and where your vent pipe connects to an existing vent pipe or exits the roof as a separate vent. Make sure that the vent's cross-sectional area is the same as the cross
sectional area of the waste outlet. The aggregate croos-sectional area can't be less than the largest required bulding sewer.
Here is the formula to get the aggregate cross sectional area of your venting system:
The square of the diameter of a circle multiplied by .7854 equals the area of the circle.
The mathmatical equation is:
Diameter x Diameter x .7854 = aggregate cross-sectional area
Example:
1 1/2" vent pipe = (1.5 x 1.5 x .7854) = 1.76715 inches
2" vent pipe = (2 x 2 x .7854) = 3.1416 inches
Total = 4.91315 inches
Add the 2 totals together to get the total cross sectional area of your plumbing vent system. You would have to use the same formula to obtain the cross sectional area of the
plumbing waste system to see if you have enough venting area allowed.
Try the formula and find out how many and what sized vents are needed to properly vent out a 4" building sewer...Don't cheat and say..."I only need a one 4" vent...Duh"...If you are a plumber that will be taking his/her journeyman test or higher, I would strongly suggest that you get this formula engraved in your brain.
By looking at the plumbing diagram it shows that the solid lines are meant for the plumbing waste. This is what tells the plumbing inspector what fixtures are being roughed in and what all the necessary sizes are. There is not much to this plumbing area, however there is a need to have the right fittings such as drainage fittings instead of venting fittings installed.
Always check with your local plumbing inspector, plumbing official or the plumbing administrative authority before attempting a rough in plumbing diagram to make sure that you have the right tools to get the job done the first time!
 Let me know if this helped!
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| Did the Bathroom Rough-In drawing Help? |
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Bathroom Rough In | Island Vent System | Vertical Wet Vent |
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