House plumbing design guide [Updated]



Last updated : Aug 27, 2022
Written by : Lakeisha Saal
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House plumbing design guide

What size pipe should I use to plumb my house?

Generally speaking, the main pipeline from the street to your home is either ¾ or 1 inch in diameter. Supply pipes are ¾ inch in diameter and individual components are ½ inch in diameter.

How do I calculate water pipe size?

1 inch= 25.4mm, 1 ft. = 304.8mm, 1 gallon/m=3.785L/m. Water velocity should not be greater than 2.438m/s at valve seat to prevent noise and erosion. So, Pipe area should be at least equal to water flow rate divided by eight.

How long does PEX plumbing last?

PEX: Due to its flexibility and durability, PEX piping should last at least 50 years. PVC / CPVC: Under typical conditions, these pipes should last up to 100 years. Keep in mind that PVC pipes are often used for drainage because extreme heat can damage them.

What is included in a set of plumbing drawings?

Mainly plumbing drawing consist of water supply system drawings, drainage system drawings, irrigation system drawings, storm water system drawings. In water supply system drawing there will be hot water piping and cold water piping and hot water return piping also.

How many fixtures can 3/4 water line supply?

For our example, our 1-inch pipe can have up to 30 fixture units, our 3/4-inch can have up to 14, and our 1/2-inch can have up to 4.

Where is PEX not allowed?

PEX can't be installed in high heat areas. You can't install PEX in high heat areas like near recessed lighting. This also means you can't connect PEX directly to a hot water heater, but you can use a connecting material to do this.

Does pipe size affect water pressure?

In water flowing pipeline, pipe size and water pressure are dependent on each other. Because if the diameter of a pipe decreased, then the pressure in the pipeline will increase. As per Bernoulli's theorem, pressure can be reduced when the area of conveyance is reduced.

What is the standard water pipe size?

The most common pipe diameter for water mains is 6 to 16 inches, with 8, 10, and 12 inches also being used. Branch lines providing service to individual homes, offices, buildings, and businesses vary in size from as small as half an inch in diameter up to 6 inches.

Do plumbers prefer PEX or copper?

No longer is copper piping the primary, or preferred, choice of most homeowners and plumbers. Cross-linked polyethylene flexible tubing—commonly called PEX—has grown in popularity for residential plumbing over the past few decades as an alternative to traditional copper and chlorinated polyvinyl chloride (CPVC) piping.

Do mice chew through PEX?

Rodents Chewing Through PEX Pipe is a common problem in our area. It doesn't matter how old your home is, if you have an attic, you need to watch for rodent damage to PEX Pipe or PVC. If you're hearing rustling noises coming from the attic, it's time to do an inspection.

Should I repipe with PEX or copper?

While PEX pipes are easier to install, cheaper, and more flexible, copper pipes are sturdier and tend to have a longer lifespan. PEX pipes are best used indoors since they degrade quickly under intense sunlight, but it's an excellent choice if you're looking to minimize leaks and energy consumption.

How do I create a plumbing plan?

To make a plumbing plan: Draw all fixtures to scale size and make sure they are not too close together. Mark the drain lines and vents for the fixtures, then add the supply lines. Make riser drawings to show vertical pipe runs as well.

Do architects create plumbing plans?

They are based on plans provided by the interior designer or architect. These plans show the engineer the location of plumbing fixtures such as toilets, sinks, and water heaters in the design.

Do House plans show plumbing?

Do the plans/blueprints include plumbing and electrical? A: The rough plumbing is included on the plans showing the kitchen and bath fixture symbols and their locations. However, the location of where the pipes come into the house is site specific and not included on the plans.

Whats better 1 2 or 3 4 water line?

Running 3/4" piping from the 1/2" feed will slightly decrease the pressure loss, meaning you'll get more pressure at your fixtures, but the difference will probably be very small. Most of the pressure loss will have already occurred in the 1/2" line before it reaches your house.

How far can you run 1 2 PEX?

A 3/8-inch line is sufficient for lengths up to 250 feet; 1/2-inch line will deliver adequate water pressure up to 350 feet; and 3/4-inch tubing is necessary to run a 500-foot line. Look for a maximum recommended lengths specification on the PEX packaging.

Is PEX-A or B better?

Kink-Resistance - PEX-A has the greatest resistance, PEX-B the lowest. You should never install kinked pipe. Bursting Pressure – Always check the tubing for maximum temperature and pressure ratings. Remember, the pressure ratings decrease as the temperature of the water increases.

Which is better PEX clamp or crimp?

Pinch Clamp Tools Work Better in Tight Spaces Especially when your PEX is pressed up against a wall—or there is just otherwise very little wiggle room to work—crimp tools can become a much bigger hassle. The larger jaw of the tool means you need ample room behind your PEX to be able to make a proper connection.

Can bacteria grow in PEX?

PEX pipe showed a higher growth of coliform bacteria than copper pipe [42]. The levels of released metal from plastic pipes were monitored in five pipe systems, PB, PVC, PP, PE, and cPVC. The metal levels in new plastic facilities were not serious except for PVC and cPVC, respectively.

Is PEX good for main water line?

PEX fittings are faster to install than copper. If you use a manifold and 'home-run' system, it's like running a garden hose to each fixture — super fast and easy. But even if you install PEX fittings in a conventional main line and branch system, the connections are quicker to make than soldering copper.


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House plumbing design guide


Comment by Asha Hildago

what's going on guys balkan arctic here and in today's video i'm going to be creating an announcement for this week's advanced balkan architect course and the topic of this course or this week's course is a topic that you have been asking me for a very long time and that's to do a beginner's tutorial or a beginner's course where i show you all of the tools and features that Revit has on offer for creating plumbing in Revit and to explain all of that on a simple building project so that's what I'm going to be showing you in this week's course so the point of this video is I'm going to go through all of the everything that I show you in this course and then in the end I'm just going to explain how to get access to this course and to the project files that I use okay so now let's head into Revit to explain everything that I'm showing you so here as you can see we have some plumbing fixtures but they're all inside of this house now you can see the house is kind of grayed out and if I select it you're going to see that here it says Revit links so that basically means that this project has been linked into Revit so because when you're doing plumbing in Revit you basically want to have one architecture project and then you link it in another project that's used for plumbing so you have those two separated so both the architect and the plumbing engineer can work kind of separately and in the same time anyways so I show you how to link up the project and I show you two basic approaches when working in plumbing with plumbing in Revit and that's basically I have these two bathrooms so in this bathroom I'll show you what to do when the architect leaves leaves basically the bathroom empty so it's up to the plumbing engineer to place all of the elements within the bathroom and then in the other case is where the architect left all of the elements so if I select it as you can see all of these elements highlight with the Revit link so all of the all of the the plumbing fixtures have been left in by the architect and then it's up to the plumbers only to install the connectors and then use those connectors to connect all of the pipes and solve all of the routing of all of the pipes so that's what I show you in this case so I show you basically the two approaches and of course I show you the kitchen approach now of course it's really important to heat up all the water so that's why I show you how to add the hot water heater both the one with the tank and also this tankless one here for the kitchen and for this small bathroom as it's a small bathroom so it doesn't need a lot of hot water so this might be a more efficient solution here in the garage I'll show you how to add this floor drain and then how to connect it to everything else it's usually a smart idea to have a floor drain inside of your garage just because when maybe it's snowing there's a lot of snow or water on your car and then it should have a place to drain so I'll show you all of that I'll show you how to get cold water to your house so basically how to connect to your water supply and then how to get that water to your home and then how to connect all of the cold water connectors and then of course how to get your cold water to the water here and then how to heat it up and get that hot water to all of the fixtures for the shower for the same cover here for the kitchen sink and all of that once we have shown how to get water to our plumbing fixtures then it's time to show you how to get water away from plumbing fixtures and that's these green lines over here that's the sanitary piping if I go into 3d maybe it's a bit easier to understand and also for sanitary piping it's really important to have that slope so it all kind of goes away naturally it doesn't have to be pressurized and as you can see here in these views it's it is sloped so Revit does all of the calculations for us we basically tell it in which direction we want water to go in and in which direction we want our pipes to go in and then rabbit does all of the hard work that's that's really cool so I show you how to connect all of the elements so here for the this water closet here for this sink here for the other sink as you can see it's completely connected for the water closet that's connected underneath over here for the shower and here for this complex sink that has basically two connectors so because it's a double sink so I'll show you what to do in that case as well so I'll show you basically in all of the strange and in different cases that you might can't come into contact in real life when working I show you all of that within this simple project so I basically show you all of the tools and features for plumbing now if you want to get access to this course I suggest you check out the first link in the description of this video so first link in the description it takes you to my patreon that's where you get to support your favorite creators in this case my channel if you would like to support this channel and by supporting me you will get access to all of my Revit courses I've got this is like 2022 courses so far they are all over one hour long this course is like 1 hour and 20 minutes so it's very long I go into all of the details and all of the tricks and tips how to download all of the fixtures pretty much everything you need to know to do a simple project like this even if you maybe have no experience in working with plumbing in rabbit so that's what's the point of this course so if you're interested in that first link in the description to my patreon you're also there you will get access to all of my rabbit files of course this file all of my files for my courses and tutorials I've got over 300 travel files so far so they're really useful if you want to just go through it and just kinda to check it out how how I modeled everything and so you can work alongside this project ok so that concludes this little announcement for this week's course so first link in description to my patreon and I'll be back with another regular balkan architect tutorial and a couple of days thanks for watching and have a nice day


Thanks for your comment Asha Hildago, have a nice day.
- Lakeisha Saal, Staff Member


Comment by Lutherwegf

um so let's start up with the basics the basic means we are here to learn the plumbing designing right so now plumbing again is a part of a building service isn't it everyone it might be any kind of building it might be a kind of i can say uh industrial commercial residential isn't it building is a building it might be of any kind of application it might be commercial or residential or industrial but this is some basic things over here which we called as a building services or we known as as mep services so what do you mean by this now you have heard this term mep service or mep thing now mep stands for mechanical electrical plumbing so now under mechanical uh comes as a quack stands for mechanical electrical plumbing so under mechanical uh comes as two things or the two services one is hvac and firefighting and second is e that is electrical service and third is plumbing service so now these are the major service i'm talking about it's not something that these three services will combine a building or this three service if it's been installed in a building that is a habitable for humans i mean a good place to live for no because there are n number of services which makes a house or a residential or commercial or application like industrial easy or convenience for the human beings as per the application of the project for example if i'm dealing with a residential i need is plumbing i need is in case of fire i need some at least at least i need what portable fire extinguishes if i'm not dealing with the i mean that uh diagram of the tree and all this so at least and it's portable so again firefighting comes into picture and without lighting we could not imagine and without air conditioning again because of the temperatures growing again day by day or year by year it's been because of global warming i can say it's increasing like anything so we are having this is basic services as well but apart from this we are having n number of services like i can say if it's a high rise building we do have lifts into that elevators or escalators in short yes or no we do have steps these are all what one more services like furniture layout or furniture these are all services so these are all combined makes a building complete and it makes a good place to live in for humans or it makes convenience or ease of the human beings to work or to live in that particular area yes or no so now what we are so we are learning among map right now we are learning is partly m and complete b so that partly ms we are dealing with a fire fighting and plumbing again so that is we are dealing with partly m and complete p that is again plumbing and fire fighting so now uh who will be gone or taking care of this will be saying this but let's have some more information about this now these three are technical fields which covers the system to make a building habitable for humans what do you mean by habitable online good enough to live in short okay or convenience to of humans okay so this the mep installations are normally designed now don't fix to installation because unless and until there is no design there is no installation yes or no so first of all this thing's mep complete would be a design of a combination that means for example there will be three design engineers one would be taken care for hvac one would be taken care for electrical one would be taking care for plumbing and firefighting so they do design on the same project because architecture layout is the same on that architecture layout the designing is being done for the plumbing on this firefighting electrical and hvac isn't it so now this all things would be designed in a particular at the same time the reason behind that is what it requires a coordination if you don't coordinate like example i have allotted some space for example like uh let's think we are in plumbing and i need some space on the ground level to keep my water tank just an example online but someone said no no they want to keep something like water cool chillers over there for hvac people so we need our coordination for example if i'm keeping overhead tank on the top okay that is roof tank okay but i got some information from the electrical node that space what you have selected i have already occupied for the solar panels just an example online so what it's a it's a major and hectic task so we need not only the design at the same time we need to sit and we need to have a kind of conversation or coordination work or coordination so that to avoid all the circumstances or this kinds of clashes into this okay so the same thing has been mentioned over here due to the high degree of interact interaction between them this combined approach also prevents equipment location now equipment refers to the machines it might be for plumbing like pumps it might be for like i can say a tanks or it might be an hvac like uh uh what shall i say so uh i like to this uh water cool or air cool chillers or number of things like duct table split or xyz outdoor units and all this if you talk about again electrical like if is going with the transformer complete for this his location i mean the project then again this needs to be also be set up okay so location conflicts has been done because we have sit and decided okay then clashes are a common problem when mechanical electrical plumbing systems are designed in isolation that means if without coordination if i'm designing it is highly impossible to do up i mean what the installation in actual practice why because there is no coordination and as per my mind i have done the designing as per his mind he have done the designing but there would be certain things over there that at the same time what we have selected for the space for our units or our equipment or the routing whatever it might be might be some other service people also have selected that if there's no coordination then it will be highly impossible to do it even though even though if we do with the coordination also again we'll be having issues as per the site conditions yes or no online so now let's go on with this so this is just some basic idea because we need to know that where exactly we are falling by like so we are in mep services that is also known as mep services or building services so but just for your information not only this service like if i'm having in a building regardless of the application whatever the application it might be regardless of application if i'm having these three services i can't say that a building is a building or it is like a habitable area for humans no because there's there's not only three service which combines or which i can say it's a complete building because there's not only the three services i am having n number of services in the building isn't it so they are listed by but what is the reason behind that it has been given priority the the reason behind this and mep has given so much a priority because this is the biggest service among all services in the building services i mean i'm talking about the building services not about the building building is complete including of all services yes or no i'm talki


Thanks Lutherwegf your participation is very much appreciated
- Lakeisha Saal


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