Plumbing Forum - Professional & DIY Plumbing Forum > General Plumbing Discussion > General Plumbing Help > Need help to run water in my detached garage

Help Support Plumbing Forums by donating using the link above or becoming a Supporting Member.
Thread Tools Display Modes
Old 10-03-2010, 04:59 AM   #1
Junior Member
Join Date: Oct 2010
Location: Québec, Québec
Posts: 1
Default Need help to run water in my detached garage

My detached garage construction will start in a weeks and I think to add running water for a sink in the garage. The garage will be at about 30' of the house (about 40-50' from where I can plug the drain and water line in the house). The digger man will make a 1 foot deep trench for electricity but I can ask to dig deeper like 4' to put water line and sewer.

1- I am in Quebec in Canada, and the frost line is probably more than 4' deep. I plan to put pipes only at 4' underground because the price for the trench jump after this deph and because the lowest foundation walls in the basement is about at 4' (if I want to go go deeper I should drill or dig into the floor and it's more complicated...) It seems easier for me to just drill a hole in the foundation wall, just a few inches above the floor of the basement and plug the sewer pipe into my main sewer pipe as you can see on the first picture join. If I add some inches of foam over pipes, do I can save a few feet of deph to avoid freezing?

2- The second idea is to make a 5" deep trench and drill and dig on the floor to connect the sewer pipe more deep into the ground (see picture) but this is more complicated and more a messy job in the housse...

3- A 4" sewer white pipe it is ok for this ? (I can go for less than 4" but from what I understand from the plumber the necessary slope for a 4" pipe (1/8 by foot) is less than for a 3" one (1/4 by feet)

3- Do copper pipe is the best ? I can make the run without join if I buy I big 60' roll. it is better to use PEX ? Somebody tell me to put copper in a PVC or ABS pipe to avoid oxidation... ?

Your advice is welcome ! (and sorry for my poor english)

PLAN1.jpg   PLAN2.jpg   drain.jpg  
AlainTernet is offline  
Reply With Quote
Old 10-03-2010, 01:53 PM   #2
Join Date: Jan 2010
Location: Orlando, FL
Posts: 5,683
Liked 965 Times on 775 Posts
Likes Given: 1739


I don't know anything about protection from freezing in colder areas with frost lines, so I can't comment on that.

As far as the copper, that should work well for what you wish to do. Unless the soil is really corrosive, you shouldn't need to run the copper inside of a sleeve.

If you use 4" pipe, the T fitting that you have circled in your last picture will have to be changed out to a 4" T. And if you use white (PVC) pipe, you will not be able to glue the black ABS and the white PVC pipe together, so you will need to plan for a mechanical joint there, perhaps a rubber coupling.
phishfood is offline  
Reply With Quote
Old 10-04-2010, 09:12 PM   #3
Easily Amused
Mr_David's Avatar
Join Date: Jan 2010
Location: Santee,Ca
Posts: 3,734
Liked 895 Times on 726 Posts
Likes Given: 592


Ditto on frost protection knowledge. Looks like you've done some previous research. Nice drawings

If all you are installing is a sink a 2" line should be okay.
. . . . . . . . . . -(@@)- . . . . . . . . .
. . . . . ----o00--()--00o----. . . . .

a.k.a. Krazedav
Mr_David is offline  
Reply With Quote

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

Similar Threads
Thread Thread Starter Forum Replies Last Post
Garage drain pit overflowing Rhea44 Drain and Sewer Cleaning 11 07-24-2012 11:42 AM
Garage Retreat Chris General Discussion 9 05-25-2012 04:17 PM
Need to add faucet in garage beast696 General Plumbing Help 6 08-13-2010 11:05 PM
Total Garage Remodel BRad704 Project Display 26 04-16-2010 05:18 PM
Drain pit in the garage dry? memorex88 Drain and Sewer Cleaning 2 02-19-2010 03:38 PM

Newest Threads