How to list 2 Half Baths
How To Plumb a Bathroom (with free plumbing diagrams)
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hello Dylan here from hammer PDA calm
and in today's video you're about to
learn how to plumb a bathroom I'm
talking drains and vents 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 in 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 4 inch closet flange here
the center of the flange is roughed in
twelve 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 wall 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 lab 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 lavs inch and a quarter
waste 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 US will permit a single
basin laughs to be roughed in with an
inch and a quarter vent 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 patter
because both the toilet and lab dumped
their waste right into our main 3-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 a four inch
PVC that drops right into this four by
three closet vent the closet Ben 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 in our trap arm
connects right into this 3-inch santi
now we've got a vertical to horizontal
transition here several choices and
fittings but in this example we're going
with a 3-inch combo you could also use a
3-inch wide width 45 as well
also notice the clean-out to add a
clean-out you'll need two additional
fittings a 3-inch clean-out adaptor in a
three inch clean-out plug the clean-out
adaptor cements right into the inlet of
the combo and provides a convenient
point of access to rob 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 Y with 45 now this
three inch drain continues downstream
and eventually wise right into this
homes building drink alright let's talk
about venting starting with the toilets
fit the size of this event depends on
your plumbing code the two most common
codes in the u.s. is the IPC in the UPC
in the IPC a toilets individual vent is
inch and a half in the UPC it's two
inches now to get this event 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 labs of it I've got it
roughed in inch and a half although both
codes will permit a single basin lab to
be installed with an inch and a quarter
of an inch and a half is per
typical though also notice how the labs
event offsets horizontal well above the
laughs flood level rim and that's
important
you also notice the horizontal event has
a slight grade to it water vapor can
condense inside vent pipes and rainwater
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 U PC unlike the IPC
the U PC will let you sneak by with a
horizontal level vent without any grade
on it this assumes it's above the flood
level room of course but keep in mind
horizontal vents can't have any sags or
any drops again that's you PC only the
IPC wants horizontal plumbing vent
sloped also note we're using a sanitary
tee to tie the lavs
individual vent into the toilets vent
notice the Santee's upside down and 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
Santi upside down now this vent extends
up through the roof or in many cases can
tee 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 Hamra p deus
website put in your email address than 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
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