DIY Chatroom Home Improvement Forum

DIY Chatroom Home Improvement Forum (
-   Plumbing (
-   -   Plumbing Diagram Assistance (

bdaub 04-28-2010 05:11 PM

Plumbing Diagram Assistance
1 Attachment(s)
I am a handy DIY and new to this forum. I am building a cottage this summer and will do the plumbing myself. It has a basement, mainfloor and a loft - the diagram is laid out as such. I have prepared my first rough draft of an isometric plumbing diagram. I have 2 soil stacks as I want to keep the greywater and blackwater seperate so that when legislation is passed in Alberta, Canada, I will have options. I am going to initially have both stacks empty into a holding tank(s). Would appreciate some advise on what is missing (cleanouts for example) and what is wrong on this diagram.


The Engineer 05-05-2010 12:49 PM

Your design looks pretty good, everything looks vented properly. As far as cleanouts are concerned, you should provide a cleanout on any horizontal lines that change direction every 90 degrees. So, the shower on the right side looks like it offsets with two 45 degree elbows, you should have a cleanout on the 2nd 45 elbow. You should also have a clean out on any lines that go from vertical to horizontal. Also, a cleanout on any vertical lines right before they penetrate the slab to the underground (if thats where their going).

Another issue I see you might have a problem with is the several fixtures on the lower level on the stack on the right side (especially the floor drain). You have the washing machine dump into the stack at the 2nd floor which will create a suds pressure zone at the point you transition horizontal below the 1st floor. If you connect the line from the floor drain and other fixtures into this stack at the wrong location, you will get suds percolating up out of the floor drain from the washing machine upstairs. You need to avoid any connection into the stack 40 pipe diameters up the stack, and 10 pipe diameters down the stack after it transitions to a horizontal run under the 1st floor. Connecting into the suds pressure zone of the stack will create suds problems for you in the future.

bdaub 05-05-2010 05:37 PM

thanks Engineer - I appreciate the help

SuperPlumberGuy 05-05-2010 06:38 PM

Nothing technically "wrong" with your diagram but, I see a lot of redundancy. Depending on the distances all three of the individual vents on the second floor could probably be eliminated. On the first floor the shower and floor drain could probably be wet vented eliminating two more individual vents. Same goes for the basement. I count nine vents in your diagram that could probably be eliminated.:eek:

bdaub 05-06-2010 07:42 AM

Thanks for the comments, "SuperPG" - don't want to do any more work than I have to. Are you saying the venting could be eliminated or would the horizontal lines be circuit vented? If circuit vented, my understanding is that the circuit vented line needs to be 3" and I was going to keep the greywater side at 2".

SuperPlumberGuy 05-06-2010 09:27 AM

GO to this website and look at "10.22 figures" look at figures 4,5, and 6.
Venting is hard to describe I hope these diagrams help

bdaub 05-12-2010 01:04 PM

Thanks SuperPG, great dsite for reference (for a novice anyways). Im starting to think that I need to post my floor plans as the diagrams I've posted do not indicate distances, pipe size etc

Felipe71 05-25-2010 03:28 PM

Plumbing assistance
I am new to this and looking to learn on how to do things. Sorry I ask but what are cleanouts and what purpose do they serve, and how to get them done?


O'Leaky 05-25-2010 05:06 PM

I don't see the Isometric drawing, just a flat drawing.

The Engineer 05-26-2010 08:32 AM


Originally Posted by Felipe71 (Post 446871)
I am new to this and looking to learn on how to do things. Sorry I ask but what are cleanouts and what purpose do they serve, and how to get them done?


Cleanouts are for access to the interior of the piping to run a snake down through in case of a clog or other issue with drainage in the line. There are specific requirements where cleanouts must be installed, like at the base of a stack where the line transitions horizontal from the vertical, at any change in direction of 90 degrees, in the vertical section of a piping before it goes underground, etc... They are typically a DWV tee fitting with a cap on the end so you can unscrew the cap to access the inside of the piping.

All times are GMT -5. The time now is 10:01 AM.

vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
User Alert System provided by Advanced User Tagging (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.

Search Engine Friendly URLs by vBSEO 3.6.1