International Association of Certified Home Inspectors
|
|||||||
| Plumbing Inspections Contains discussions about plumbing. |
![]() |
|
|
LinkBack | Thread Tools |
|
#1
|
||||
|
||||
|
Somewhere along the way, I got it into my head that aside from a minimum slope for a horizontal waste drain line, there is also a maximum. The idea being that if there is too much slope, the liquids will drain away faster than the solids and consequently the solids may hang up in the line. Then when a vertical drop is necessary, it is done abruptly, more or less straight down vertically.
For the life of me, however, I can't seem to find an IRC reference to a "maximum" slope for a horizontal run. Did I imagine this, or am I just not seeing well today?? If anyone can point me in the right direction, I would appreciate it! Aside from the general interest, I do have a specific issue that got me thinking about this. A customer called me who had just recently moved into a "newly constructed" townhome. 3-4 days after he moved in, a first floor toilet overflowed. Turned out that the waste line going from the home in the yard had been damaged, dirt accumulated in the line and caused the line to back up. The plumber fixed the waste line, but the owner said that after the line was fixed, the angle at the clean out, elbow in the basement noticeably changed. Before the fix, the owner says the the vertical drop came more or less straight down and then swept out at a gradual horizontal run out through the foundation wall. Now the vertical drop "slants" somewhat, goes into the clean out tee which seems to have a fall of 3"/ft. Although not much of the vertical run is visible, I can see the portion in the wall and then based on the angle of the exterior clean out in the yard, it would "appear" that the 3"/ft horizontal angle continues for at least 2' - 3'. Does anyone think that there is a problem with this or does it seem acceptable? Mark MD HI Lic # 30090 BPI Certified Building Analyst PA DEP Radon Cert # 2457 Certified Home Energy Tune-uP Inspector
|
|
#2
|
|||
|
|||
|
You are correct in saying a drain line can have "too much" slope, as far as what the specifics are, call one of your local plumbers and ask.
|
|
#3
|
||||
|
||||
|
Quote:
Mark MD HI Lic # 30090 BPI Certified Building Analyst PA DEP Radon Cert # 2457 Certified Home Energy Tune-uP Inspector
|
|
#4
|
||||
|
||||
|
Christopher Currins Certified, Licensed Proudly serving the Illinois Metro-East Illinois Home Inspector Top 5 Tasks for January |
|
#5
|
||||
|
||||
|
Normally 1/2" per ft is accepted (without a fitting - 45 deg or other). Most code inspecters pay little if any attention to this in plastic. It used to be a larger issue in Cast Iron when you actually had to use long turn sweeps at the bottom of a vertical stack. Crap sticks to cast iron.
In the world view we are all important and our mere existence effects all life. Jack Gilleland Home Inspection Services Clayton Commercial, Multifamily, and Residential jgilleland1@att.net Ohio_Commercial and_Home_Inspections activerain |
|
#6
|
||||
|
||||
|
Thanks for the help guys!
Mark MD HI Lic # 30090 BPI Certified Building Analyst PA DEP Radon Cert # 2457 Certified Home Energy Tune-uP Inspector
|
![]() |
| Thread Tools | |
|
|
Similar Threads
|
||||
| Thread | Thread Starter | Forum | Replies | Last Post |
| 980 Questions/Answers to the NHIE....Free! | jbushart | Legislation, Licensing & Legal Issues for Inspectors | 50 | 4/20/08 2:26 AM |
| Waste line clean outs | tcrosby | Plumbing Inspections | 2 | 2/29/08 11:55 PM |
| 2 water heaters, combined TPR and pan drain line | lfoster | Plumbing Inspections | 11 | 12/18/07 12:23 PM |
| Waste line on OUTSIDE of house | gkeene | Plumbing Inspections | 6 | 9/18/07 10:15 PM |
| Maximum slope of drain line? | bsmith | Plumbing Inspections | 6 | 4/16/07 2:28 PM |