DIY Home Improvement, Remodeling & Repair Forum > DIY Home Improvement > Plumbing Forum > Changing single lav to double


Reply
 
Thread Tools Search this Thread
Old 04-20-2017, 02:15 AM  
nealtw
Contractor retired
 
nealtw's Avatar
Join Date: Nov 2010
Location: Upper Fraser Valley, British Columbia
Posts: 22,015
Liked 2567 Times on 2257 Posts
Likes Given: 4283

Default Changing single lav to double

Will something like this work.


Click image for larger version

Name:	double_lav_rough_1.jpg
Views:	20
Size:	103.7 KB
ID:	13905  
nealtw is offline  
 
Reply With Quote
Old 04-20-2017, 06:06 AM  
johnjh2o
Junior Member
Join Date: Sep 2016
Posts: 26
Liked 12 Times on 10 Posts
Likes Given: 10

Default

By using a long turn DBL TY you have created two full S traps.


johnjh2o is offline  
 
Reply With Quote
Old 04-20-2017, 06:10 AM  
Sparky617
Member
Join Date: Nov 2014
Location: Cary (Raleigh), NC
Posts: 486
Liked 143 Times on 117 Posts
Likes Given: 96

Default

Quote:
Originally Posted by johnjh2o View Post
By using a long turn DBL TY you have created two full S traps.
There is nothing there that would trap water. You'd still need traps to keep sewer gasses from coming up through the drains.
Sparky617 is offline  
 
Reply With Quote
Old 04-20-2017, 06:16 AM  
johnjh2o
Junior Member
Join Date: Sep 2016
Posts: 26
Liked 12 Times on 10 Posts
Likes Given: 10

Default

The traps are installed when the sinks are installed. But they will be S traps because where the waste enters the vent it will be below the trap seal creating a S trap.
johnjh2o is offline  
 
Reply With Quote
Old 04-20-2017, 10:55 AM  
frodo
Senior Member
 
frodo's Avatar
Join Date: Aug 2008
Posts: 2,775
Liked 1024 Times on 806 Posts
Likes Given: 365

Default

you have to use a 2x1.5x1.5x1.5 fixture fitting

Click image for larger version

Name:	ff fixture.png
Views:	14
Size:	26.1 KB
ID:	13909


you can not use a double wye and 1/8 bend also called a double combination

Click image for larger version

Name:	double combo.jpg
Views:	15
Size:	8.8 KB
ID:	13907


the reason is, the long sweep on a combo cuts off the vent

Click image for larger version

Name:	ayQd9.jpg
Views:	16
Size:	34.4 KB
ID:	13908
__________________
Cogito, ergo armatus sum.

My advice is free, If I have helped you and you wish to help the site out with a gift
use this link
http://www.houserepairtalk.com/forum/...faq=supporting

Last edited by frodo; 04-20-2017 at 10:59 AM.
frodo is offline  
2
People Like This 
Reply With Quote
Old 04-20-2017, 07:09 PM  
nealtw
Contractor retired
 
nealtw's Avatar
Join Date: Nov 2010
Location: Upper Fraser Valley, British Columbia
Posts: 22,015
Liked 2567 Times on 2257 Posts
Likes Given: 4283

Default

Thanks guys, I figured it was going to work, just wanted to make sure.


nealtw is offline  
 
Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search

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


Similar Threads
Thread Thread Starter DIY Home Repair Forum Replies Last Post
Replacing double sink with single van_geezy Plumbing Forum 13 03-09-2016 10:26 AM
Double vanity to single vanity? Jasonc126 General Home Improvement Discussion 7 03-05-2016 02:45 PM
Retrofit - replace glass only single pane to double pane in wooden frame. plp Windows and Doors 3 01-05-2015 02:39 PM
single-pole double-throw switch kentannenbaum Electrical and Wiring 6 01-28-2011 05:59 AM
single vs double pole for 240v kentannenbaum Electrical and Wiring 2 12-21-2010 05:52 AM



Newest Threads