How To Plumb a Bathroom (with free plumbing diagrams)

hello dylan here from hammerpedia.com and in today's video you're about to learn how to plumb a bathroom i'm talking drains and vince also stick around to the end of this video because i'll send you the plumbing diagrams for these two bathrooms the first diagram is for the bathroom i'm about to plumb in this video and the second diagram you'll get is for this full bathroom right here more on these diagrams in just a minute alright so before you plumb a bathroom you need to know some basic rough-in measurements let's start with the toilet i'm using a four-inch closet flange here the center of the flange is roughed in 12 inches measured from the finished wall if you're measuring from an unfinished wall add in your wall thickness most likely that's half inch drywall which puts the center of the flange 12 and a half inches measured from a stud bowl you also need at least 15 inches of clearance from the center of the flange to any adjacent wall or adjacent plumbing fixture so that means 15 inches of clearance to the left and 15 inches to the right that's code minimum and you can have more also notice the closet flange sits directly on top of the finished floor moving over to the bath lab this is a 30 inch vanity i've got our inch and a half bath lab drain centered right in the middle of the vanity also the center of the drain is approximately 18 inches above the finished floor the lav is roughed in with an inch and a half sanitary tee in the vertical position also the water lines are roughed in approximately 21 inches above the finished floor they're spaced around eight inches apart and here's what you'll need to connect the plumbing under your bathroom sink you'll need an inch and a half trap adapter you'll also need an inch and a half plastic p-trap trim trap kits like this come with two different sizes of washer you'll use the inch and a half by inch and a quarter slip joint washer to connect the lav's inch and a quarter waist outlet to the inch and a half trap and here you can see that reducing washer i'll also mention that both major codes in the u.s will permit a single basin lab to be roughed in with an inch and a quarter of it and an inch and a quarter trap however in this example i'm going all inch and a half let's move around to the back of this bathroom so you can see how these drains connect together this is a nice simple pattern because both the toilet and lav dump their waste right into our main three inch drain right from the vertical the key to this pattern is getting your main three inch horizontal drain directly under and parallel to your plumbing wall moving upstream to the toilet here we've got a four inch closet flange the flange connects to a short piece of four inch pvc that drops right into this 4x3 closet bend the closet bend fitting is four inches on the inlet and three inches on the outlet now normally the plumbing code never allows a drain to be reduced in size in the direction of flow like this however there's one exception and it's with toilets plumbing code does not consider a four by three closet connection as a reduction in size and this fitting is a great choice under a four inch flange then our trap arm connects right into this three inch santee now we've got a vertical to horizontal transition here several choices in fittings but in this example we're going with a three inch combo you could also use a three inch wide with 45 as well also notice the cleanout to add a clean out you'll need two additional fittings a three inch cleanout adapter and a three inch cleanout plug the cleanout adapter cements right into the inlet of the combo and provides a convenient point of access to rod the drain in case of a backup let's move downstream to the left we've got another vertical to horizontal transition here which again requires a long sweep fitting in this case we're going with a three by three by inch and a half wide with 45. now this three inch drain continues downstream and eventually wise right into this home's building drain all right let's talk about venting starting with the toilets vent the size of this event depends on your plumbing code the two most common codes in the us is the ipc in the upc in the ipc a toilet's individual vent is inch and a half in the upc it's two inches now to get this vent to connect into our three inch sanitary tee i'm using a flush bushing if you're in the ipc use a three by inch and a half flush bushing or if you're in the upc go with a three by two bushing let's quickly talk about the lavs of it i've got it roughed in inch and a half although both codes will permit a single basin lav to be installed with an inch and a quarter of it inch and a half is pretty typical though also notice how the labs vent offsets horizontal well above the labs flood level rim and that's important you'll also notice the horizontal vent has a slight grade to it water vapor can condense inside vent pipes and rain water also enters part of your venting system so put just a little bit of slope on your horizontal vents to drain any of that moisture back to your drainage system now i will mention something to my friends in the upc unlike the ipc the upc will let you sneak by with a horizontal level vent without any grade on it this assumes it's above the flood level rim of course but keep in mind horizontal vents can't have any sags or any drops again that's upc only the ipc wants horizontal plumbing vents sloped also note we're using a sanitary tee to tie the lav's individual vent into the toilet's vent notice the santee is upside down in the ipc this can be an inch and a half sanitary tee upside down or the upc go with a two by two by inch and a half sand tee upside down now this vent extends up through the roof or in many cases can t into the home's existing venting system alright so that wraps up this bathroom and we put together this free plumbing diagram of the very bathroom i just plumbed in this video it's a detailed 3d cad drawing we've also included another free diagram of this full bathroom right here you'll see how all these drains and vents connect together and we labeled each dwv fitting for you based on both major codes in the us and here's how you can get your free digital copy of these bathrooms you'll find a link in the description of this video just click the link you'll be taken to this page on hamrapedia's website put in your email address then a minute or two later you'll receive an email from us with the diagrams inside you can print them out and save them to your computer thanks for watching

Channel: Hammerpedia

Views: 4,426,057

Keywords: how to plumb a bathroom, plumbing diagram, dwv plumbing, plumbing under bathroom sink, dwv fittings, how to plumb a bathroom sink, bathroom plumbing vents, bathroom plumbing, rough in dimensions, plumbing tips

Id: bbqZ12QhoY4

Length: 6min 17sec (377 seconds)

Published: Thu Mar 07 2019