Installing Bathroom In Basement Need Advice - Plumbing - DIY Home Improvement | DIYChatroom


Go Back   DIY Chatroom Home Improvement Forum > Home Improvement > Plumbing

CLICK HERE AND JOIN OUR COMMUNITY TODAY...IT'S FREE!

Reply
 
Thread Tools Display Modes
Old 05-10-2009, 01:58 PM   #1
Newbie
 
Join Date: Mar 2009
Posts: 22
Rewards Points: 10
Default

Installing Bathroom in Basement Need Advice


Hello,

I am building a full bathroom in my basement. I have completed the framing. Rough plumbing was completed when the house was built. I installed a peatrap for the shower. I am using a shower basin.

I have 3 other pvc pipes coming up from the basement floor. One waste for the toliet and two vents. I assume one vent is for the sink and the other for the shower.

I am confused on how to vent the sink. If I use 1 1/2" pvc for the sink waste, do I tie the sink waste into the vent pvc with a Sanitary tee? Can I tie both vent pipes together and run them up to the above bathroom vent pipe?

I am going to run the cooper as well. I see there is 3/4" pipe running out the main branch. Do I continue to run 3/4" pipe all the way to the sink, shower, and toliet -- then come down with 1/2" pipe to the shower, toliet, and sink? Also, does it matter where I add the shock absorbers at each fixture?

Is there anything else I should know? I appreciate your advice?

By the way, I live in the Chicagoland area just in case you needed to know.

Advertisement

Jeffrey262 is offline   Reply With Quote
Old 05-11-2009, 07:30 AM   #2
Member
 
Join Date: Apr 2009
Posts: 203
Rewards Points: 150
Default

Installing Bathroom in Basement Need Advice


Quote:
Originally Posted by Jeffrey262 View Post
Hello,

I am building a full bathroom in my basement. I have completed the framing. Rough plumbing was completed when the house was built. I installed a peatrap for the shower. I am using a shower basin.

I have 3 other pvc pipes coming up from the basement floor. One waste for the toliet and two vents. I assume one vent is for the sink and the other for the shower.

I am confused on how to vent the sink. If I use 1 1/2" pvc for the sink waste, do I tie the sink waste into the vent pvc with a Sanitary tee? Can I tie both vent pipes together and run them up to the above bathroom vent pipe?

I am going to run the cooper as well. I see there is 3/4" pipe running out the main branch. Do I continue to run 3/4" pipe all the way to the sink, shower, and toliet -- then come down with 1/2" pipe to the shower, toliet, and sink? Also, does it matter where I add the shock absorbers at each fixture?

Is there anything else I should know? I appreciate your advice?

By the way, I live in the Chicagoland area just in case you needed to know.
Usually on a 3 piece bath rough in the basement you should have 3 pipes coming out. A 4 inch pipe for the toilet a 2 inch pipe for the lavi drain and vent and a 2 inch for the shower drain which should already have a p-trap in it(if you are putting a tub in you would reduce this one to 11/2inch just above the p-trap. Usually the lavi drain acts as a vent for the whole bathroom depending on how far apart the fixtures are. You want to keep it 2 inch all the way to the main stack or thru the roof whichever is easiest. When you tie your vent in make sure that you are 6 to 8 iches above the flood rim of the highest fixture. If you hada rough in the basement check to see if they dropped a future vent into the basement and capped it off. I always did that but most plumbers don't unless required by code. To tie into the stack you can use a sanitary tee turned upside down to allow the flow of air to rise upwards easier.
As far as the water line goes I usually don't catch more than 3 fixtures on a 1/2 inch line(some codes allow for 6 or 7 on a 1/2 inch line). For example I would run 3/4 inch to the toilet on the cold then reduce to 1/2 inch to catch the shower and vanity and on the hot I would tie into a 3/4 inch line and run 1/2 to both lavi and shower. If you want more volume You can run 3/4 all the way to each fixture but I find that unnecessary unless you have very low water pressure and even then it doesn't help much.
The shock absorbers should be behind the wall as close to each fixture as possible.

Advertisement

al's sewer is offline   Reply With Quote
Old 05-11-2009, 08:29 AM   #3
JDC
Plumbing Contractor
 
JDC's Avatar
 
Join Date: Mar 2008
Location: Cincinnati, OH
Posts: 392
Rewards Points: 250
Default

Installing Bathroom in Basement Need Advice


The water hammer arrestors (shock absorbers) are usually installed on fixtures with quick closing valves (ie selanoid valves) such as washing machine box, dishwasher, etc. Using them in the bathroom wont hurt though. I'd just put in one set on the shower with an access panel and ball valves for changing them out when the time comes.

As far as the pipes coming out of the floor...
One for the toilet, 3 or 4 inch
One for the shower vent most likely
One for the lavatory drain. You cut this off at the proper elevation, install a sanitary tee for your fixture arm going to your vanity, then the vent comes out of the top of the tee. As Al stated, be sure you are at least 6 inches above the highest fixture served before tying your vents together. Run the vent up to an existing vent and tie it in or run it out the roof on its own. Check to see what size your vent must be at the roof penetration if you are running it out on its own. In Ohio it has to be at least 3" due to frost considerations so...if the vent in the house is smaller it must increase in size 6" before it exits the structure.

Last edited by JDC; 05-11-2009 at 08:35 AM.
JDC is offline   Reply With Quote
Old 05-11-2009, 03:09 PM   #4
Newbie
 
Join Date: Mar 2009
Posts: 22
Rewards Points: 10
Default

Installing Bathroom in Basement Need Advice


Quote:
Originally Posted by al's sewer View Post
Usually on a 3 piece bath rough in the basement you should have 3 pipes coming out. A 4 inch pipe for the toilet a 2 inch pipe for the lavi drain and vent and a 2 inch for the shower drain which should already have a p-trap in it(if you are putting a tub in you would reduce this one to 11/2inch just above the p-trap. Usually the lavi drain acts as a vent for the whole bathroom depending on how far apart the fixtures are. You want to keep it 2 inch all the way to the main stack or thru the roof whichever is easiest. When you tie your vent in make sure that you are 6 to 8 iches above the flood rim of the highest fixture. If you hada rough in the basement check to see if they dropped a future vent into the basement and capped it off. I always did that but most plumbers don't unless required by code. To tie into the stack you can use a sanitary tee turned upside down to allow the flow of air to rise upwards easier.
As far as the water line goes I usually don't catch more than 3 fixtures on a 1/2 inch line(some codes allow for 6 or 7 on a 1/2 inch line). For example I would run 3/4 inch to the toilet on the cold then reduce to 1/2 inch to catch the shower and vanity and on the hot I would tie into a 3/4 inch line and run 1/2 to both lavi and shower. If you want more volume You can run 3/4 all the way to each fixture but I find that unnecessary unless you have very low water pressure and even then it doesn't help much.
The shock absorbers should be behind the wall as close to each fixture as possible.
Al,
Thank you for the information. As far as the rough in, here is what I have:
1) One 4" pipe for the Toliet
2) Two 2" pipe -- I thought both of these were vents
3) One 3", 3 1/2", or 4" pipe for the shower drain.

I attached a few pictures of the rough in.

I also attached a picture of a vent pipe above or very close to the location of the new bathroom. I assume I can tie al the vents into this pipe.

Do you think both of those 2" pipes are vents? If they are, what do you recommend I do for a drain?

There is an ejector pump already in place. If you want I can go take a picture of the bathroom frame to show you where the elector pump is located.

Thank you
Attached Images
     
Jeffrey262 is offline   Reply With Quote
Old 05-11-2009, 03:47 PM   #5
Member
 
Join Date: Apr 2009
Posts: 203
Rewards Points: 150
Default

Installing Bathroom in Basement Need Advice


Quote:
Originally Posted by Jeffrey262 View Post
Al,
Thank you for the information. As far as the rough in, here is what I have:
1) One 4" pipe for the Toliet
2) Two 2" pipe -- I thought both of these were vents
3) One 3", 3 1/2", or 4" pipe for the shower drain.

I attached a few pictures of the rough in.

I also attached a picture of a vent pipe above or very close to the location of the new bathroom. I assume I can tie al the vents into this pipe.

Do you think both of those 2" pipes are vents? If they are, what do you recommend I do for a drain?

There is an ejector pump already in place. If you want I can go take a picture of the bathroom frame to show you where the elector pump is located.

Thank you
Ok it looks like they drop a future vent for you all you have to do is tie all you vents into that pipe. the 2 2 inch lines are probably your lavi waste and a releif vent on the toilet just tie them together after you put you tee in for your lavi waste and hook up to that pipe with a cap on the end of it. Your sewer ejector should have a separate vent of its own going through the roof. your shower drain only has to be 2 inch also. if your ejector pit is not vented thru the roof on its own go ahead and tie it into the vent system for the basement bath not exactly up to code but oh well
al's sewer is offline   Reply With Quote
Old 05-11-2009, 04:48 PM   #6
Newbie
 
Join Date: Mar 2009
Posts: 22
Rewards Points: 10
Default

Installing Bathroom in Basement Need Advice


Quote:
Originally Posted by al's sewer View Post
Ok it looks like they drop a future vent for you all you have to do is tie all you vents into that pipe. the 2 2 inch lines are probably your lavi waste and a releif vent on the toilet just tie them together after you put you tee in for your lavi waste and hook up to that pipe with a cap on the end of it. Your sewer ejector should have a separate vent of its own going through the roof. your shower drain only has to be 2 inch also. if your ejector pit is not vented thru the roof on its own go ahead and tie it into the vent system for the basement bath not exactly up to code but oh well

Al, Thanks.

How do I know which 2" pipe is the vent and which is for the sink waste?

--jeff
Jeffrey262 is offline   Reply With Quote
Old 05-12-2009, 07:33 AM   #7
Member
 
Join Date: Apr 2009
Posts: 203
Rewards Points: 150
Default

Installing Bathroom in Basement Need Advice


Quote:
Originally Posted by Jeffrey262 View Post
Al, Thanks.

How do I know which 2" pipe is the vent and which is for the sink waste?

--jeff
The one on the right is the furthest from toilet rough in so I would say it would be that one, but if that is on the wrong side just use the other one the toilet will still vent so basically either one can be used If I was doing it I would use the one on the right if at all possible.

Advertisement

al's sewer is offline   Reply With Quote
Reply

Tags
basement bathroom , sink installation


Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Drop ceiling in basement bathroom handyflyer Remodeling 23 05-26-2009 10:12 PM
Effluent pump for basement bathroom Christopher C Plumbing 7 04-23-2009 10:35 AM
Basement Bathroom Costs ktulu05 Remodeling 15 04-20-2009 02:24 PM
Circuit advice for finishing basement Straightgrain Electrical 16 03-25-2009 10:07 AM
basement bathroom heat ktrehs HVAC 3 03-12-2007 04:23 PM




Top of Page | View New Posts