Return to the Remodeling Forum | Post a Follow-Up

 o
Clamp to suppress floor joist noise transmission?

Posted by MLF1 (My Page) on
Sun, Mar 4, 12 at 23:28

We are remodeling our 84-year old house. We have a main house unit and an attached in-law unit.

There is significant and annoying foot traffic noise transmission between the units through the floor joists.

Is anyone aware of a "clamp" that could be applied to the floor joists in the crawl space, to stop the sound transmission at a specific location along the joist? I'm imagining something that performs the same function as plucking a guitar string and a finger prevents the vibration from traveling the entire length of the string.

We are also investigating carpeting, and extra soundproofing in one area that has a new floor. We'd like to avoid the expense of removing and replacing pretty and functional high-quality 84-year old wood flooring.

Thanks.


Follow-Up Postings:

 o
RE: Clamp to suppress floor joist noise transmission?

If the floor joists run continuously from the main house to the attached unit, any 'clamping' would probably just change the frequency of the impact sound transmission; if they don't run continuously, bracing the joists in both sides to the nearest joist is recommended . A floating floor above the existing floor or a new engineered subfloor, such as Quietwood, would likely be effective, but you would lose the antique flooring.

See also: www.nrc-cnrc.gc.ca/obj/irc/doc/pubs/nrcc49468/nrcc49468.pdf "Guide for Flanking Sound Transmission in Wood Framed Construction"

(GW does not accept pdf links)


 o
RE:followup

Ah, better yet, a Guide from the same authors: www.nrc-cnrc.gc.ca/obj/irc/doc/pubs/rr/rr193/rr193.pdf


 o
RE: Clamp to suppress floor joist noise transmission?

Thanks very much, Worthy - I'll check these out.


 o
RE: Clamp to suppress floor joist noise transmission?

If the joists are continuous from one unit to the other over a crawl space you might build a new supporting wall under the dividing wall that would absorb some of the structure borne sound and also create a barrier for air borne sound in the crawl space.


 o
RE: Clamp to suppress floor joist noise transmission?

You can also install solid blocking under the party wall between the joists to break up the sound path.

Stopping airborne sound is not usually all that hard.

Stopping conducted sound (like footsteps on a floor) is significantly harder.


 o
RE: Clamp to suppress floor joist noise transmission?

You may also want to look into installing MLV (Mass Loaded Vinyl) under the joists. The MLV should absorb much of the vibration travelling through the joists. As brickeyee stated, conducted noise, or impact noise, is tough to deal with.

Another solution would be to put a sound deadening underlayment atop the new floor, like Impact Barrier.

Here is a link that might be useful: Impact Barrier


 o Post a Follow-Up

Please Note: Only registered members are able to post messages to this forum.

    If you are a member, please log in.

    If you aren't yet a member, join now!


Return to the Remodeling Forum

Information about Posting

  • You must be logged in to post a message. Once you are logged in, a posting window will appear at the bottom of the messages. If you are not a member, please register for an account.
  • Please review our Rules of Play before posting.
  • Posting is a two-step process. Once you have composed your message, you will be taken to the preview page. You will then have a chance to review your post, make changes and upload photos.
  • After posting your message, you may need to refresh the forum page in order to see it.
  • Before posting copyrighted material, please read about Copyright and Fair Use.
  • We have a strict no-advertising policy!
  • If you would like to practice posting or uploading photos, please visit our Test forum.
  • If you need assistance, please Contact Us and we will be happy to help.


Learn more about in-text links on this page here