What size pipe should be used when converting from single to double Bathroom Sink?


As country handyman says, if the're already supplying enough you don't need to change them.

However, if you're seeing a temp increase when you flush, then you ARE losing pressure, and the hot is making up for it, unbalancing your temperature.

I'll wager a guess that the pipe is currently 1/4 inch and that the toilet is fed before the sink. If that's the case, then when the toilet is running there is less water flow available to the sink and/or shower (assuming it's on the same line too).

So if you're opening up the bathroom walls anyway, you can do two things here to deal with this:

Reroute the cold so that it goes to the sink first and then the toilet. (Or better, shower, then sink, then toilet)

Increase your pipe diameter to the bathroom and split off 1/4 inch lines for each fixture.

In my own case when I remodeled, I replaced the 1/4" galvanized line to the bathroom with 1/2" PEX, and used 1/2 : 1/4 T junctions to split off feeds for...

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I am refinishing our master bathroom (as part of the process of getting everything back together from the flood) and I am going to convert from a single sink vanity to a double. I don't necessarily want to take the "easy" way out just to get it plumbed, I want it to be as close to the right way to do it as I can.

The existing plumbing is kinda weird where the drain comes out of the wall off center and then goes towards the center where the single sink was. I have a feeling I am going to have to redo this anyway when I switch to a new vanity since most vanities have drawers and whatnot. I want to make sure both sinks are vented properly and have the right type of trap/drain as well so I don't run in to problems.

Attached are a couple pictures, one of what it looks like in the bathroom and the others are what it looks like from in the basement. Luckily, I have pretty easy access to everything, but unfortunately it is 2x3's which is going to make it a tight fit for...

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Converting your bathroom from having a single bathroom sink to a double bathroom sink can seem like a daunting task. There are many benefits, from doubling the existing space to your bathroom looking more sophisticated, however there are a lot of things you will need to make sure of before you begin the project.

Measuring Your Bathroom

The first and most important thing you will need to know before you begin the project, you will need to consider the amount of space you have in your bathroom. Consider things like whether you can fit an extra sink in without extending it, or getting a new vanity, and if you do have to extend it, how that will affect the rest of your bathroom. Tighter bathrooms can be set up like puzzles, with each appliance fit in perfectly, and it may not be possible to extend the counter.

Toilets and bathtubs can be tricky things to relocate, even if you do have enough space. If you decide that you need to rearrange some of your existing...

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When tackling do-it-yourself plumbing jobs, knowing what pipe fittings to use is essential. This is because pipe fittings play the critical role of joining pipes together and allowing a series of pipes to change directions as needed. In most cases, a specific type of fitting is required to ensure that a series of pipes will perform correctly, so buyers will need to spend some time determining the exact types of fittings they will need before beginning a plumbing project.

There are a number of important factors buyers should consider when choosing pipe fittings. The materials used to construct a pipe fitting directly relate to how the fitting can be joined to pipes and what types of pressure the pipe assemble can handle. Pipe connections can be achieved through a number of means, but are not interchangeable. Pipe fittings are designed in a variety of shapes that permit a series of pipes to navigate around common obstacles, like walls or beams that are found in every building....

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You will need to make a couple slight alterations however it is impossible to know for sure what you will have to do until the wall is opened up and we can see the present layout of the water & drain lines. The good news is that even if you have to make alterations, they are very simple and certainly well within the skill level of an experienced DIY'er.


(See attached illustration)

Assuming that the two sinks were put in to code it is not nearly as weird as Hendricus would have us believe.

Under both the UPC & IRC if the horizontal center to center distance between the two drain openings does not exceed 30" they may be combined in the same manner as connecting a kitchen double sink, then connected to a single trap & waste arm.

Under the IRC if the CTC distance exceeds 30" you may attach a double wye on the waste arm and run a separate line to each trap, with a cleanout on the end of the WYE, Providing...

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When water empties from the kitchen sink, it goes through a sometimes complex network of pipes before it gets to the main waste pipe, which is typically in the wall. This pipe network is usually made of PVC and can be 1 1/4 or 1 1/2 inches in diameter.

Sink Drain Systems

In the most basic system, the sink drain opens to a vertical length of pipe, called the tailpiece, which connects to the P-trap assembly that consists of a curved pipe and a horizontal extension that extends to the waste line. Things get more complicated when more than one sink, a dishwasher or a garbage disposal is connected to the drain system, and there may be extra drain extensions, tees and Y-fittings.

Pipe Size

Some older sinks may have drains that connect to a 1 1/4-inch tailpiece, but most modern drains have a 1 1/2-inch outlet. All the pipes that connect to the tailpiece, including the P-trap assembly and all the horizontal extensions, are either 1 1/4 or 1 1/2 inches in...

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The conversion from float to double is a widening conversion, as specified by the JLS. A widening conversion is defined as an injective mapping of a smaller set into its superset. Therefore the number being represented does not change after a conversion from float to double.

More information regarding your updated question

In your update you added an example which is supposed to demonstrate that the number has changed. However, it only shows that the string representation of the number has changed, which indeed it has due to the additional precision acquired through the conversion to double. Note that your first output is just a rounding of the second output. As specified by Double.toString,

There must be at least one digit to represent the fractional part, and beyond that as many, but only as many, more digits as are needed to uniquely distinguish the argument value from adjacent values of type double.

Since the adjacent values in the type double are...

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I need more information. What kind of show, double handle, single handle, the pout, the handle, the shower...it leaking. Have a single handle shower. I was pour out water.

When working with the plumbing be sure to turn the main water off.

Set a side a block of time where no one needs to use the bathroom or water. Single handle, take the outer ring off. The outer ring is what keeps the handle tight on the housing. Now, you should see two screws remove them. The handle should come out. You should see two inlets, in each inlet you should see sm. black rubber in them. replace them with new ones. reverse installation from above. and you should be good to go. turn the main water on.

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I'm renovating an entire flat. Last year had a Vaillant ecotec pro 24 boiler installed. Bathroom and toilet room have been renovated entirely, and the main bathroom now has a toilet installed.

The plumber was told to run mains cold water to the bathroom (previously only hot water from the boiler, which is connected to mains, ran to the bathroom and toilet room) and he replaced the old copper pipe, which was about 15mm, to a new plastic pipe with a larger diameter (22mm). But, he ran the new pipe from a weird location, there is still about 1metre of old piping in the kitchen.

Now, we have an issue with the bath filler, when turning hot water to max, it would flow very poorly do we told him to replace the hot eater pipe too, because we thought it would improve flow rate. The plumber did it without second guessing, and also ran the new pipe from the same weird location as the new cold water pipe starts. So it kind of looks like this: Boiler > old 15mm pipes > kitchen...

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These days, bathroom renovations are a common home improvement project. With a myriad of bathroom styles to choose from and a wealth of options for fixtures and faucets, the decisions seem endless. Just when you have it all figured out, you learn you can turn that cramped single sink into a spacious double vanity in no time!

If you are tackling this yourself:

In addition to the new vanity, sink and faucets, plus usual home improvement tools, you will also need additional plumbing supplies. These include a Tee and Y-fitting, and PVC pipes. HGTV suggests using double outlet valve as outlined on their site. You'll need to follow any cabinet removal and installation instructions from the beginning.

Steps for Converting the Sink

Converting a single sink into a dual sink involves tying each sink to the main drain line. The two sinks will need to be connected first before attaching them to the drain. This allows the use of a single trap instead of having to...

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A double vanity can offer a "his" and "hers" sink. Or it can make available one sink for grownups and one for children, or it can simply provide more grooming space in a busy bathroom. This gives you two sinks for the price of one -- the "price" being the plumbing stub-outs you need for a single sink. In most cases, you can easily adapt the supply and drain pipes to accommodate two sinks, using tee fittings, special valves, extension pipes and hoses. You may have to vent each sink separately, though, depending on your local plumbing codes.

Install the sinks with a maximum of 30 inches between them, if you want them to share a common drain. The spacing of the holes in most precut countertops follows this requirement. If you're installing sinks at different levels, there shouldn't be more than a 6-inch height difference between them.

Affix the drain assembly to each sink before you install it in the cabinet. It's also easier to install each faucet if you bolt it to the...

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What exactly do you think is not up to code?

There is no code mandate for height of drain or supply lines. There are rules of thumb and those certainly can be modified, especially to work with a given vanity.

UPC 704.2 says, "Two fixtures set back-to back, or side-by-side within distance allowed between a trap and its vent may be served by a single vertical drainage pipe provided that each fixture wastes separately into an approved double-fixture fitting having inlet opening at the same level." So, that doesn't look to be an issue.

Also, doesn't exceed load for the drain or vent.

What else do you consider problematic?

Last edited by LowlyDIYer; 01-12-2012 at 11:33...
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Hello mac517. Welcome to the Community!

Normally the venting for sinks is a vertical pipe inside the wall which leads from the drain up to the roof. It is not necessary for each basin to have its own vent, as you will tie both basins to that same wall drain. Only if you are starting with a stud wall and using separate wall drains will you need both to be vented. Even then you would simply tie the vents together at some level higher than the sink tops.

How you do that depends on what is the easiest way given vanity layout, drawers and spacing between the basins. You can either tie the basins together before a single P trap like is often done with double kitchen sinks, or have each basin get its own trap and run their horizontals into a Tee or Wye fitting at the common wall drain. In addition, some installations would use a double Wye where the extra hub has a cleanout plug.

Is this what you are looking...

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