Author Topic: Treadmill produces "rumbling" according to downstairs neighbor  (Read 5622 times)

Staggard

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Treadmill produces "rumbling" according to downstairs neighbor
« on: February 17, 2008, 05:14:07 AM »
Hello all and thank you for the informative forum!  I've purchased a big ticket treadmill to allow myself the freedom to run when I want and still be a dad.  The treadmill itself if super quiet but my 180lbs bouncing up and down at 120 steps/minute creates a rumble which understandably p!sses off my downstairs neighbor. 
My flooring is concrete with a hopelessly thin pad and a typical plush carpet.  He says that he can hear everything which makes me more than a little paranoid.  That aside, however, I've been tinkering with the idea of laying a 4x8 flooring over the carpet as a place for my treadmill.  Originally, the idea was several sheets of MDF bolted together, but after reading a bit I've realized that this would suck. 
The next idea is a 4x8 box using 2 sheets of MDF or plywood sandwiching a frame work of 2"x4"s upon which I'll secure the TM.  I think that this is a bit better since it utilizes deadspace, but from what I gather here is that I'll still be transfering vibration through the wood joists to my neighbor below.  Also, I need to engineer something that will support nearly 500 lbs with 4 small contact points which is further complicated by the fact that nearly 200 lbs will be bouncing up and down upon it.  I'm not a much of a physics buff or an engineer, but I believe that the impact being absorbed by my little box frame could be somewhere around a 1/2 ton. 
However, an upside to the box frame idea is that will be dispersing that weight and vibration across 32 square feet of carpet more or less.  The dead space isn't a major benefit as the noise is more vibrational like bass, but I don't suppose filling the space with anything would make a difference.  1) I would consider one of these sound proofing sheet products to go between the MDF and joists.  I'm curious if this would work mechanically, however, since it'll have a lot of weight smashing up against it.  A second solution 2) would be to add a layer of sheeting to the outside of the MDF and sandwich it with yet another layer of MDF.  This would effectively create a floating structure off the box frame and could even be doubled up for both top and bottom sides. 

I hope I didn't bore you all with my project details, but I'd love a critical review before I leap into a $$$ project.  If I'm being redundant with materials please point out my errors so I can keep this down budgetwise.  Thanks all!

Mark Daveis

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Re: Treadmill produces "rumbling" according to downstairs neighbor
« Reply #1 on: February 17, 2008, 09:03:55 PM »
For impact noise you need a Vibration Pad like this
http://www.soundservice.co.uk/vibration_pad.html.
Or you could be even more pro and mount the TM on helical springs.
For airborne noise you need to add more mass to your floor preferably damped mass like mlv.
Stay away from too much MDF in the home because of the formaldehyde but hardboard is very cheap and has more mass than MDF/plywood and so on. I would recommend coating the hardboard with latex or inserting sheets of rubber between to give more damping. You could use lots of layers of mlv on the floor but this is expensive or one or two layers mixed with say hardboard.
A booth could be built for the TM but may be going a bit too far. Four small contact points may not work as there will be so much pressure at these points if rigid. :)

Randy S

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Re: Treadmill produces "rumbling" according to downstairs neighbor
« Reply #2 on: March 19, 2008, 04:48:27 PM »
You can find "Anti-vibration" Pads here
http://www.soundproofing.org/infopages/vibrationpads.htm#Vib
And you can use MLV W/ Closed cell Foam Underlayment on the floor to improve de-coupling and sound barrier.
http://www.soundproofing.org/infopages/flooring.htm
Randy Sieg

Super Soundproofing Co
www.soundproofing.org
888-942-7723
Ph. 760-752-3030
Fax.760-752-3040

 

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