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