The Holy Grail of Plumbing Isometric Drawings
I have always believed that one of the most difficult talents to master in the plumbing and mechanical trade is being able to provide accurate plumbing isometric drawings. Let’s define what an Isometric Drawing is first before going into more detail: an Isometric Drawing is drawing detail representing pipe, fittings and fixtures at a 45° angle in order to represent three dimensional detail on two dimensional drawings. Having a well-done set of isometric drawings is like having a well-done set of instructions to build a swing set. When a good draftsmen, estimator or project manager is skilled enough to be able to provide the foreman or project superintendent with isometric plumbing drawings the men in the field can do what they get paid to do and that’s put in pipe and fittings. It literally takes the thinking out of plumbing layout. As the industry transitions to digital media, computer programs can do and isometric pipe drawing for you however there is always a catch. If there is garbage that went into the plan view (most times it is garbage) then the isometric drawings will be worse. Quite often it’s not PE or a plumber that does the MEP drawings so they are usually incomplete or woefully inadequate to install a complete plumbing system.
Piping Isometric Drawing Reference Guide
So while I was going through my plumbing stuff I happened across one of the best references I have ever had and used. They are the isometric plumbing drawings for common residential building floor layouts, i.e. back-to-back bathrooms, kitchens, powder rooms in just about every configuration you can think of. But wait there’s more. Along with each drawing there is a complete and accurate pipe and fitting takeoff for waste, vent and water piping. Please contact me for a PVF takeoff for the waste and vent isometric drawings. There would be too many questions with pipe sizing and materials.
So here is how I will present this, Each Isometric drawing will be linked to a printable and sharable PDF. I will list the pipe and fitting take off after each drawing as well as an explanation of each fixture configuration. I can’t tell you how many times I’ve gone to these drawings for estimates, layout help and fitting configurations so I hope it helps you too.
Because these drawings are so well done they can also be used to help you do your own isometric drawings in any configuration you see fit. I’ve always found these drawings put me in the right place spatially to envision how and where piping should go.
1.) Back to Back Bathtubs, Water Closets and Lavatories – This is an plumbing isometric of the water piping for a condominium or apartment building where there are two bathrooms in the same unit or in separate units piped back to back. The water supply risers are coming in on one end of the bathrooms.
2.) Single Bathtub, Water Closet and Lavatory – This plumbing isometric represents a battery of plumbing fixtures with just one bathtub, water closet and lavatory. This would be used most commonly in a small apartment building where there is only one bathroom per apartment. It is possible there are two sets of water risers serving bathrooms but it can get expensive so the architect/engineer usually like to reconfigure a building to make use of as few risers as possible.
3.) Single Bathtub, Water Closet & Lavatory with Utility Sink – This isometric represents a battery of plumbing fixtures with a little twist. In order to save pipe chase space an architect may put the kitchen or utility room behind the bathroom so you can use the water piping to pipe in a kitchen or utility sink.
4.) Back to Back Bathtubs, Water Closets & Lavatories – This is a little different configuration. As you can see from the isometric drawing the water-piping riser is coming up in the middle of the bathroom. Although the piping is similar this will give you a visual idea of how the piping will look. Sometimes due to building design the pipe chase can be right in the middle of a stack of bathrooms. This is not an unusual design.
5.) Single Bathtub, Water Closet & Lavatory – Pretty self explanatory, very similar configuration to the previous with the water-piping riser in the middle.
6.) Single Bathtub, Water Closet & Lavatory with Utility Sink – Please see #3. The only difference is the water riser location.
7.) Back to Back Bathtubs, Lavatories & Water Closets – This is very similar to the #1 however the lavatories and water closets are flipped.
8.) Single Bathtub, Lavatory and Water Closet – This is very similar to #2 however the lavatory and water closet are flipped.
9.) Single Bathtub, Lavatory with Utility Sink & Water Closet – This is very similar to #3 however the lavatory and water closet are flipped.
10.) Single Bathtub, Lavatory and Water Closet – This is very similar to #8 but the water piping risers are in the middle.
11.) Back to Back Bathtubs, Lavatories & Water Closets – Very similar to #7 with the water piping risers in the middle.
12.) Single Bathtub, Lavatory with Utility Sink and Water Closet – Very similar to #9 but the water piping risers are in the middle.
13.) Waste & Vent Piping for Back to Back Lavatories, Water Closets and Bathtubs – You can use this waste and vent isometric for PVC, no-hub cast iron or copper however with most buildings trying to cut the budget PVC or No-Hub is usually the way to go.
14.) Waste & Vent Piping for Single Lavatory, Water Closet and Bathtub
15.) Waste & Vent Piping for Back to Back Water Closets, Lavatories and Bathtubs.
16.) Waste & Vent Piping for Single Water Closet, Lavatory and Bathtub
17.) Waste & Vent Piping for Single Water Closer, Lavatory w/Utility Sink & Bathtub
As always thanks for ready and I sincerely hopes this helps. I know it helped me like crazy over the years. If you have any further questions you can contact me firstname.lastname@example.org.
Here is the Slideshare for the entire set of drawings.