Tapping Sound From PVC Drain Line - Plumbing - DIY Home Improvement | DIYChatroom

Go Back   DIY Chatroom Home Improvement Forum > Home Improvement > Plumbing


Thread Tools Display Modes
Old 02-25-2011, 06:36 PM   #1
Join Date: Feb 2011
Posts: 15
Rewards Points: 10

Tapping Sound from PVC Drain Line

I am hearing a rather loud "tap" sound when I run the top level fixtures. It sounds like it might be coming from a wall. From where I can hear it, the drain runs straight down into an expansion joint, where several other drains tie in, and then down into the sewer.

I have looked for signs of water in the basement but haven't seen or been able to feel any, from where I can reach my fingers up into the hole that the 3" drain comes through. Is it possible that the pipe is tight against the wood framing in the wall and the sounds I hear are the groans of thermal expansion/contraction?

The sounds stop when I stop using the drain, but I've noticed they seem to give one last "tap" when I step on the floor near the wall in question.


mforeman1 is offline   Reply With Quote
Old 02-25-2011, 06:44 PM   #2
Hvac Pro
yuri's Avatar
Join Date: Nov 2008
Location: Winnipeg, Canada
Posts: 12,166
Rewards Points: 2,474

Tapping Sound from PVC Drain Line

In my house in a COLD climate the vent pipe/stack from the sink/tub goes into the attic and when I run hot water heat rises up it and it expands/contracts it and makes noise. Sounds like an expanding/contracting noise to me. Houses/wood expands/contracts with the seasons/changes in moisture so it may come and go.


"Cut it twice and it is still too short".

Last edited by yuri; 02-25-2011 at 06:46 PM.
yuri 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
tapping water line for new line KarlJay Plumbing 5 07-28-2010 09:30 AM
Bathroom Sinks do not line up with drain pipe - what do I do? mark2741 Plumbing 7 04-15-2010 07:11 PM
Furnace leak while running AC unit lbartowski HVAC 3 09-18-2009 01:46 PM
Sound dampening advice needed steel1 General DIY Discussions 10 10-22-2008 01:51 AM
trickling water sound in the drain yfulmer Plumbing 2 11-25-2007 10:49 PM

Top of Page | View New Posts