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-   -   vibrating down spouts! (http://www.houserepairtalk.com/f45/vibrating-down-spouts-15388/)

Flightsport 01-18-2013 06:18 AM

1 Attachment(s)
Recently had new Windows and siding installed. With that came new clips for the down spouts. We knew something was wrong during the first wind storm when it sounded like a freight train. It was like our house became a huge woodwind instrument. When the wind blows hard enough, the down spout acts like a reed and vibrate against the trim. VERY loud in the house, hard to sleep! Looks like if I reset the screws so the spout is slightly further from the trim, this would solve it. Any suggestions? See pics and vid clip below.



Attachment 4718

The video...


oldognewtrick 01-18-2013 08:04 AM

Have your installer come back and install the rest of the down-pipe straps. That should stop the movement.

CallMeVilla 01-18-2013 08:34 AM

That would be irritating ... Additional clips in that area would stop the flexing. Immediately, you could buy a length of insulating foam tubing used for hot water pipes. The tubing comes with a slit down the length. Cut 6" sections off and slide them between the downpipe and the house. Problem solved until the added brackets get installed. :D

nealtw 01-18-2013 08:45 AM

Oldog, Are you sure that adding more just won't change the pitch or tone. The old style just may be better at stopping the outside of the pipe from vibrating.

mudmixer 01-18-2013 11:11 AM

The vibration is oviously a result of the wind.

I live in a 30 year old "quad home" ( 4 - 2 story units each on the corner of a rectangular building. The gutters are on the long side of the building with a down spout at each end. Due to the weather and trees, the old gutter downspout system was replaced with larger sizes and all gutter guards and similar things were tossed to eliminate water and maintenance problems. - With the new system, it is surprising to see leaves blowing up the downspouts under certain conditions, so the wind does strange things.

When they installed the seamless gutters with prefab corners (8 per gutter), they put in an extra downspout support that was near the midpoint of the downspout, but not at the center. I asked the installer why it was not centered on the drop he said it was done to intentionally break the length into an odd dimension (1/3 or 3/5 of the length) to confuse or eliminate the vibration, if it tried to occur.

A simple solution to a high tech problem.

Dick

Wuzzat? 01-18-2013 01:25 PM

More straps
or
spacer blocks between the spout and the wall
will change the resonant frequency of the spout to something outside of the range that most wind can produce.

Foam blocks behind the spout may damp out the vibration and would work in much the same way as a crankshaft harmonic balancer.

oldognewtrick 01-18-2013 02:35 PM

Quote:

Originally Posted by nealtw
Oldog, Are you sure that adding more just won't change the pitch or tone. The old style just may be better at stopping the outside of the pipe from vibrating.

They should have a strap at each length of pipe. There won't be any flexing if another strap is added. When you just have a slip union, there is nothing to stabilize the pipe joint. Add a strap, no more problem.

JoeD 01-18-2013 04:11 PM

I agree with more straps to solve the issue.

BridgeMan 01-18-2013 04:14 PM

And make sure the noises aren't (at least partially) caused by the new siding, all by itself--assuming it's vinyl. Some of the lower-end vinyls on the market can be pretty flimsy. I remember being able to walk down our street in a Colorado subdivision on a moderately windy day, and most of the vinyl-sided houses would creak and twang, loudly enough to be heard from the street. I never looked into the exact causes of the noises, and it could have been materials and/or workmanship.

Wuzzat? 01-18-2013 05:45 PM

You may be able to test the spout fix with a leaf blower. The airspeed is way higher than most wind but the energy delivered to the spout will be pretty small.

I'll take a WAG and say
if the blower makes the spout vibrate then the fix is not good but
if the blower doesn't make it vibrate then the fix may still not be good.

You could test this test procedure on your neighbor's downspouts, with their permission of course! :p


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