Drain Slopes - Kitchen & Bath Remodeling - DIY Chatroom Home Improvement Forum

Go Back   DIY Chatroom Home Improvement Forum > Home Improvement > Remodeling > Kitchen & Bath Remodeling


Thread Tools Display Modes
Old 05-30-2011, 10:52 PM   #1
Join Date: May 2011
Posts: 12
Rewards Points: 10

Drain Slopes

Hi all,

Thanks for the thoughts I've gotten so far here, it's really helping me wrap my mind about the project.

Today's question is regarding drain slopes. I know that I'm supposed to have the drain pipes slope 1/4" for every foot. My question is "how do I ensure this?"

When I've worked with pvc piping before, the pipes set all the way into the fittings, and so they come straight out. I can bend the straight lengths somewhat, but on larger pipes it would be harder to do this.

In wandering around my cralwspace, most of the drain pipes didn't seem to be hung from straps or hooks or anything I'd normally picture would be involved. However, the straight lengths were somewhat short. Maybe that's enough that they could just be set at the right angle.

The only thing I can picture as a possibility is to control the slope using the veritcal pipes from the drains. If I cut them successively longer, that could force the slope. However, that feels pretty complicated if you don't know the entire geometry...

So, what is the standard/best installation technique for maintaining that critical slope?




gpsmith is offline   Reply With Quote
Old 06-08-2011, 12:24 AM   #2
Join Date: Mar 2007
Location: Long Island, NY
Posts: 11,009
Rewards Points: 4,980

Drain Slopes

The drain at some point turns, say at 90 degrees. Measure the space below the subfloor to the bottom of the 90.
Run the next pipe length and set the end at the proper drop. Support the middle at the proper height. If the run is 10 feet, the midpoint will be set 1 1/4" (5, 1/4's)below the drain 90. The end at 10, 1/4's(2 1/2" down from the drain 90.
Fill in any intermediate supports as necessary.


"They that can give up essential liberty to obtain a little temporary safety deserve neither liberty nor safety."
B. Franklin 1759
Ron6519 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
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
Bathtub Drain Leak Help! jgcable Plumbing 54 12-19-2010 11:40 PM
Furnace leak while running AC unit lbartowski HVAC 3 09-18-2009 02:46 PM
Wierd Floor Drain "Backup" rawkintrevo Plumbing 9 06-04-2008 08:10 PM
The Bioswale, french drain, deck, drainage dilemma (long) seabright_sc Building & Construction 2 01-05-2008 04:37 PM

Top of Page | View New Posts