# Schedule 40 PVC DWV & supply **URL:** \ **Category:** Plumbing Inspections\ **Created:** [June 5, 2006, 3:20am UTC](https://forum.nachi.org/t/schedule-40-pvc-dwv-supply/4722 "2006-06-05T03:20:11Z")\ **Posts on this page:** 19\ **Page:** 1
**Author:** ![kshepard](https://sea2.discourse-cdn.com/internachi/user_avatar/forum.nachi.org/kshepard/32/59504_2.png) [@kshepard](https://forum.nachi.org/u/kshepard)\ **Post date:** [June 5, 2006, 3:20am UTC](https://forum.nachi.org/t/schedule-40-pvc-dwv-supply/4722/1 "2006-06-05T03:20:11Z")
Whole house schedule 40 PVC. I know it’s not acceptable for supply piping and pretty sure it’s not acceptable for DWV. ABS OK, PVC bad. Right? ---
**Author:** ![JLilly](https://sea2.discourse-cdn.com/internachi/user_avatar/forum.nachi.org/jlilly/32/950_2.png) [@JLilly](https://forum.nachi.org/u/JLilly)\ **Post date:** [June 5, 2006, 3:30am UTC](https://forum.nachi.org/t/schedule-40-pvc-dwv-supply/4722/2 "2006-06-05T03:30:56Z")
I see no problem with schedule 40 PVC. That is most of what I see and have installed myself. ---
**Author:** ![dduffy](https://sea2.discourse-cdn.com/internachi/user_avatar/forum.nachi.org/dduffy/32/554_2.png) [@dduffy](https://forum.nachi.org/u/dduffy)\ **Post date:** [June 5, 2006, 3:36am UTC](https://forum.nachi.org/t/schedule-40-pvc-dwv-supply/4722/3 "2006-06-05T03:36:00Z")
Kenton, This is from the 2006 IPC \*\*608.8 Identification of potable and nonpotable water. \*\*In all buildings where two or more water distribution systems, one potable water and the other nonpotable water, are installed, each system shall be identified either by color marking or metal tags in accordance with Sections 608.8.1 through 608.8.3. \*\*608.8.1 Information. \*\*Pipe identification shall include the contents of the piping system and an arrow indicating the direction of flow. Hazardous piping systems shall also contain information addressing the nature of the hazard. Pipe identification shall be repeated at maximum intervals of 25 feet (7620 mm) and at each point where the piping passes through a wall, floor or roof. Lettering shall be readily observable within the room or space where the piping is located. \*\*608.8.2 Color. \*\*The color of the pipe identification shall be discernable and consistent throughout the building. \*\*608.8.3 Size. \*\*The size of the background color field and lettering shall comply with Table 608.8.3. ---
**Author:** ![lcapaul](https://sea2.discourse-cdn.com/internachi/user_avatar/forum.nachi.org/lcapaul/32/627_2.png) [@lcapaul](https://forum.nachi.org/u/lcapaul)\ **Post date:** [June 5, 2006, 4:37am UTC](https://forum.nachi.org/t/schedule-40-pvc-dwv-supply/4722/4 "2006-06-05T04:37:32Z")
> [@kshepard](#): > > Whole house schedule 40 PVC. I know it’s not acceptable for supply piping and pretty sure it’s not acceptable for DWV. ABS OK, PVC bad. Right? PVC Sched 40 is fine for DWV systems, just don’t mix them with ABS, PVC Sched 40 is not allowed for water distribution except for cold water distribution outside the building, if allowed by local codes… ---
**Author:** ![kshepard](https://sea2.discourse-cdn.com/internachi/user_avatar/forum.nachi.org/kshepard/32/59504_2.png) [@kshepard](https://forum.nachi.org/u/kshepard)\ **Post date:** [June 5, 2006, 5:14am UTC](https://forum.nachi.org/t/schedule-40-pvc-dwv-supply/4722/5 "2006-06-05T05:14:14Z")
Dale, there was only one water distribution system, if the definition of the term “distribution” is the same as the term “supply”. I don’t think “distribution” could be applied to DWV piping. ---
**Author:** ![bkelly2](https://sea2.discourse-cdn.com/internachi/user_avatar/forum.nachi.org/bkelly2/32/58257_2.png) [@bkelly2](https://forum.nachi.org/u/bkelly2)\ **Post date:** [June 5, 2006, 5:18am UTC](https://forum.nachi.org/t/schedule-40-pvc-dwv-supply/4722/6 "2006-06-05T05:18:59Z")
> [@kshepard](#): > > Dale, there was only one water distribution system, if the definition of the term “distribution” is the same as the term “supply”. I don’t think “distribution” could be applied to DWV piping. Kenton you are correct, I think Dale just missed it. ---
**Author:** ![tnoisaw](https://avatars.discourse-cdn.com/v4/letter/t/f04885/32.png) [@tnoisaw](https://forum.nachi.org/u/tnoisaw)\ **Post date:** [June 5, 2006, 3:55pm UTC](https://forum.nachi.org/t/schedule-40-pvc-dwv-supply/4722/7 "2006-06-05T15:55:04Z")
PVC DWV Good! ABS DWV Bad! My personal opinion based on repairing ABS over the last decade. PVC & ABS bad for water distribution. We could not use it where I lived. Under some circumstances PVC schedule 80 was acceptable. ---
**Author:** ![kshepard](https://sea2.discourse-cdn.com/internachi/user_avatar/forum.nachi.org/kshepard/32/59504_2.png) [@kshepard](https://forum.nachi.org/u/kshepard)\ **Post date:** [June 5, 2006, 4:05pm UTC](https://forum.nachi.org/t/schedule-40-pvc-dwv-supply/4722/8 "2006-06-05T16:05:15Z")
I just got off the phone with the local bldg. dept. who said that PVC is not allowed for supply, but is allowed for DVW if the pipe is markeed “DVW”. This could vary from area to area. Probably best to check with local AHJ. ---
**Author:** ![dduffy](https://sea2.discourse-cdn.com/internachi/user_avatar/forum.nachi.org/dduffy/32/554_2.png) [@dduffy](https://forum.nachi.org/u/dduffy)\ **Post date:** [June 5, 2006, 4:57pm UTC](https://forum.nachi.org/t/schedule-40-pvc-dwv-supply/4722/9 "2006-06-05T16:57:14Z")
Hi Kenton, I had an inspection in a different county where I normally do business and PVC was used for both the potable and waste. The pipes were clearly labeled clarifying the difference with a magic marker. I didn’t regard the hot water piping as being allowed, but it was accepted by the AHJ after I call them also. Schedule 40 is good up to 140 degrees I believe, I wouldn’t want it in my house but some authority’s allow it here. Some of the county inspections out in tim-buck-too you never know who allowed what when without calling to beg their indifference. ---
**Author:** ![kshepard](https://sea2.discourse-cdn.com/internachi/user_avatar/forum.nachi.org/kshepard/32/59504_2.png) [@kshepard](https://forum.nachi.org/u/kshepard)\ **Post date:** [June 5, 2006, 6:09pm UTC](https://forum.nachi.org/t/schedule-40-pvc-dwv-supply/4722/10 "2006-06-05T18:09:58Z")
Dale, from what I’ve been able to gather, the problem with PVC is that it becomes increasingly brittle with age and so will break more easily as time goes on. Impact, water hammer and point stress from fasteners are apparently all a concern. -Kent ---
**Author:** ![bkelly2](https://sea2.discourse-cdn.com/internachi/user_avatar/forum.nachi.org/bkelly2/32/58257_2.png) [@bkelly2](https://forum.nachi.org/u/bkelly2)\ **Post date:** [June 5, 2006, 6:43pm UTC](https://forum.nachi.org/t/schedule-40-pvc-dwv-supply/4722/11 "2006-06-05T18:43:29Z")
Dale I understand Non-Potable Water Systems to be different than Waste/Sewage systems. Is this not correct? ---
**Author:** ![tnoisaw](https://avatars.discourse-cdn.com/v4/letter/t/f04885/32.png) [@tnoisaw](https://forum.nachi.org/u/tnoisaw)\ **Post date:** [June 5, 2006, 6:57pm UTC](https://forum.nachi.org/t/schedule-40-pvc-dwv-supply/4722/12 "2006-06-05T18:57:01Z")
I believe it’s a preasure thing. Schedule 40 is not made for that high of preasure. DWV has no preasure. ---
**Author:** ![kshepard](https://sea2.discourse-cdn.com/internachi/user_avatar/forum.nachi.org/kshepard/32/59504_2.png) [@kshepard](https://forum.nachi.org/u/kshepard)\ **Post date:** [June 5, 2006, 8:24pm UTC](https://forum.nachi.org/t/schedule-40-pvc-dwv-supply/4722/13 "2006-06-05T20:24:05Z")
The 1/2" was labeled 600 PSI, the 1 1/2" used for DVW was labeled 330 PSI. ---
**Author:** ![jsieg](https://sea2.discourse-cdn.com/internachi/user_avatar/forum.nachi.org/jsieg/32/2298_2.png) [@jsieg](https://forum.nachi.org/u/jsieg)\ **Post date:** [June 6, 2006, 1:11am UTC](https://forum.nachi.org/t/schedule-40-pvc-dwv-supply/4722/14 "2006-06-06T01:11:33Z")
Question??? If you are not using PVC SCH40 what are you using for drain & vent lines? I still see some PVC SCH30 in some older homes. Don’t forget about CPVC!!! That is used for supply. [http://www.ppfahome.org/cpvc/index.html](http://www.ppfahome.org/cpvc/index.html) A note about PVC pipe below: [http://www.uni-bell.org/faq.html#q12](http://www.uni-bell.org/faq.html#q12) These are from manufactures not from a plumbing code book, but they do quote codes. ---
**Author:** ![kshepard](https://sea2.discourse-cdn.com/internachi/user_avatar/forum.nachi.org/kshepard/32/59504_2.png) [@kshepard](https://forum.nachi.org/u/kshepard)\ **Post date:** [June 6, 2006, 1:40am UTC](https://forum.nachi.org/t/schedule-40-pvc-dwv-supply/4722/15 "2006-06-06T01:40:41Z")
Jason, around here it’s mostly ABS with occasional cast iron for anything 4" or bigger. Older homes will have copper. -Kent ---
**Author:** ![jsieg](https://sea2.discourse-cdn.com/internachi/user_avatar/forum.nachi.org/jsieg/32/2298_2.png) [@jsieg](https://forum.nachi.org/u/jsieg)\ **Post date:** [June 6, 2006, 12:37pm UTC](https://forum.nachi.org/t/schedule-40-pvc-dwv-supply/4722/16 "2006-06-06T12:37:10Z")
> [@kshepard](#): > > Jason, around here it’s mostly ABS with occasional cast iron for anything 4" or bigger. Older homes will have copper. -Kent ABS I see in mobile homes & manufactured homes. When I said older I wasn’t talking 1970’s… older than that I see 3-4" cast and copper is rare. I have seen lead under an old track home I used to own for the waste line… Note: A lot of track homes have lead supply coming from the street to the water meter. ---
**Author:** ![dduffy](https://sea2.discourse-cdn.com/internachi/user_avatar/forum.nachi.org/dduffy/32/554_2.png) [@dduffy](https://forum.nachi.org/u/dduffy)\ **Post date:** [June 6, 2006, 9:52pm UTC](https://forum.nachi.org/t/schedule-40-pvc-dwv-supply/4722/17 "2006-06-06T21:52:48Z")
> [@bkelly2](#): > > Dale I understand Non-Potable Water Systems to be different than Waste/Sewage systems. Is this not correct? Yes…non-culinary use…😃 …for either type! ---
**Author:** ![bkelly2](https://sea2.discourse-cdn.com/internachi/user_avatar/forum.nachi.org/bkelly2/32/58257_2.png) [@bkelly2](https://forum.nachi.org/u/bkelly2)\ **Post date:** [June 6, 2006, 10:58pm UTC](https://forum.nachi.org/t/schedule-40-pvc-dwv-supply/4722/18 "2006-06-06T22:58:00Z")
Nice try Dale. An example of non potable water would be landscaping piping or pool piping downstream of the vacuum breaker. Waste piping has solids in it. ---
**Author:** ![dduffy](https://sea2.discourse-cdn.com/internachi/user_avatar/forum.nachi.org/dduffy/32/554_2.png) [@dduffy](https://forum.nachi.org/u/dduffy)\ **Post date:** [June 6, 2006, 10:59pm UTC](https://forum.nachi.org/t/schedule-40-pvc-dwv-supply/4722/19 "2006-06-06T22:59:23Z")
> [@bkelly2](#): > > Nice try Dale. > > An example of non potable water would be landscaping piping or pool piping downstream of the vacuum breaker. > > Waste piping has solids in it. When you ask silly questions I try to respond with a silly answer…😛