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Old 04-27-2016, 12:41 PM   #1
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Pipe knocking


Hope someone can help me troubleshoot this:

I have a 1 floor house in texas, built circa 2005. Recently I've been having issues with a rattling pipe which I've been unable to identify. Here are the issues:

1. When someone turns on the water in the master bedroom, a pipe somewhere in the attic rattles. It starts off with a knock every 1-2 second or so, slowly speeding up and dying out. It usually rattles for about 20 seconds or so. Then, it's quiet.

2. It seems to be associated with the hot water, the best I can tell, and the master bathroom. The master bathroom is fairly far from the water heater, so usually wife leaves the water running for a while to warm up. So I am thinking it's thermal in nature. The water heater is gas, attic-mounted as well.

3. I tried to catch it in progress, but whenever I sit around in the attic waiting for the rattle, it just doesn't happen. If I try to make a run for it when I hear it, by the time I pull down the ladder and the ladder's spring quiets down, it's gone.

I realize there is not much to go by, but what would pros think of these symptoms? The attic pipes are easy to access, and I tried moving them by hand, and don't seem unnecessarily loose. I have a general area identified, and the few places I've checked under the blown insulation, the pipes go through 2x6s, and wrapped in some plastic clamps inside the beams. There is a few mm play in some cases.
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Old 04-27-2016, 02:55 PM   #2
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Re: Pipe knocking


Yea, as you stated, have to investigate a little further.

Whats your incoming water pressure? Should be around 50_60psi. Make sure the expansion tank on your water heater is set to same psi if you have one. If nothing but water comes out, replace it.

Also check your pressure reducing valve if you have one. Sometimes they need cleaning, adjusting, or replacement. Just a couple more things to check that won't take long.
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Old 04-27-2016, 03:29 PM   #3
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Re: Pipe knocking


Thanks! I will check that out, I need to get a pressure gauge.

Could this be a sign of an aging water heater? I've been waiting for an excuse to replace it, it's original with the house (so, installed 2005). However it's working fine so I keep putting it off. It flushes cleanly too.
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Old 04-27-2016, 03:36 PM   #4
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Re: Pipe knocking


I Agree. If at broke dont fix it. But at that age, i'd start bugeting for a new one.
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Old 04-27-2016, 04:14 PM   #5
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Re: Pipe knocking


Quote:
Originally Posted by injvstice View Post
Thanks! I will check that out, I need to get a pressure gauge.

Could this be a sign of an aging water heater? I've been waiting for an excuse to replace it, it's original with the house (so, installed 2005). However it's working fine so I keep putting it off. It flushes cleanly too.
If its never been serviced/flushed in 11 years, could be sediment build up in it, making snap, crackle and pop sounds.

Yes, doing annual service on it will help it last longer.
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Old 04-27-2016, 07:01 PM   #6
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Re: Pipe knocking


Sounds like the hw pipe is rubbing against wood or anchors and is expanding due to heat
Rum just cold water- if no sound then it's the hot line expanding.

I hesitate to say that this is definitely the problem because of the way you described the sound. Most people would say it's a ticking sound....
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Old 04-27-2016, 07:01 PM   #7
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Re: Pipe knocking


Sounds like the hw pipe is rubbing against wood or anchors and is expanding due to heat
Rum just cold water- if no sound then it's the hot line expanding.

I hesitate to say that this is definitely the problem because of the way you described the sound. Most people would say it's a ticking sound....
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