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Old 03-15-2019, 01:05 PM   #1
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Framing Under Beam - isolating for sound


So I'm framing a wall under a steel beam that runs the length of my basement. I'm trying to build a music room so I'm going to be doing isolation channels and two layers of drywall.


My question though is should I be worried about screwing the top plate directly under the beam? Should I use some kind of material between the two so the wall doesn't vibrate the beam? Know what I'm trying to say?


And I plan on cutting small 2x6's and gluing them onto the beam so I can add the channel at the top of the wall. Will that be a problem?
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Old 03-15-2019, 01:10 PM   #2
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Re: Framing Under Beam - isolating for sound


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Old 03-15-2019, 01:24 PM   #3
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Re: Framing Under Beam - isolating for sound


The beam should be drilled so you can add a plate to the bottom or fill the inside with lumber, With out that I would build the wall on one side or the other and then box out the beam
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Old 03-15-2019, 02:25 PM   #4
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Re: Framing Under Beam - isolating for sound


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Originally Posted by Nealtw View Post
The beam should be drilled so you can add a plate to the bottom or fill the inside with lumber, With out that I would build the wall on one side or the other and then box out the beam
I got that part, my question is, is there anything I should put between the frame and my top plate so the framing doesn't send extra vibration into the beam? Like the green glue joist tape or something


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Old 03-15-2019, 02:30 PM   #5
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Re: Framing Under Beam - isolating for sound


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I got that part, my question is, is there anything I should put between the frame and my top plate so the framing doesn't send extra vibration into the beam? Like the green glue joist tape or something


I haven't seen it used but this is what they advertise it for. I think it would be worth trying.
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Do not use flat bottom gables with scissor trusses.
https://www.fema.gov/media-library-d...6/chapter7.pdf
figure 7-14
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Old 03-16-2019, 09:09 AM   #6
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Re: Framing Under Beam - isolating for sound


What you want is sill seal, like this: https://www.amazon.com/Dow-Sill-Seal.../dp/B074KK3XGD

I'd drill a few small (3/8" or less) holes in the bottom flange and bolt (or screw if you can fit a suitable driver between flanges) your header frame member to the bottom flange with a layer of sill seal between them. Then frame out as necessary below that.

However, depending if/where you plan on walling parallel to the joists, what's your plan for dealing with the column? If you plan to have your wall continue past the column, what Neal suggests is a better idea—just screw your top plate to the joists in front of, or behind the beam. If you do it in front of the beam, you don't need to worry about boxing out the beam, unless you also finish out the area behind the wall.

Also, what's your plan for the area above the beam, where the joists go across it? Are you planning to drywall in a ceiling too?

Consider using some MLV in your wall (and ceiling) too.
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Old 03-16-2019, 08:38 PM   #7
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Re: Framing Under Beam - isolating for sound


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Originally Posted by huesmann View Post
What you want is sill seal, like this: https://www.amazon.com/Dow-Sill-Seal.../dp/B074KK3XGD

I'd drill a few small (3/8" or less) holes in the bottom flange and bolt (or screw if you can fit a suitable driver between flanges) your header frame member to the bottom flange with a layer of sill seal between them. Then frame out as necessary below that.

However, depending if/where you plan on walling parallel to the joists, what's your plan for dealing with the column? If you plan to have your wall continue past the column, what Neal suggests is a better idea—just screw your top plate to the joists in front of, or behind the beam. If you do it in front of the beam, you don't need to worry about boxing out the beam, unless you also finish out the area behind the wall.

Also, what's your plan for the area above the beam, where the joists go across it? Are you planning to drywall in a ceiling too?

Consider using some MLV in your wall (and ceiling) too.

My plan is to use construction adhesive and glue in sections of 2x6 into the beam so I can run the channeling for the drywall.
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Old 03-17-2019, 09:07 AM   #8
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Re: Framing Under Beam - isolating for sound


Beam looks painted...don't know how well construction adhesive will stick. I still think you're gonna have to end up drilling holes, but the beam web is actually a better place for them.
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Old 03-18-2019, 03:55 PM   #9
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Re: Framing Under Beam - isolating for sound


Started framing the last long wall under the beam



This was a lot of work.. but drilled all the top plates into the beam
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Old 03-18-2019, 06:14 PM   #10
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Re: Framing Under Beam - isolating for sound


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Originally Posted by spaz View Post
Started framing the last long wall under the beam



This was a lot of work.. but drilled all the top plates into the beam
That looks good, but did you put something between wood and concrete?
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Do not use flat bottom gables with scissor trusses.
https://www.fema.gov/media-library-d...6/chapter7.pdf
figure 7-14
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Old 03-19-2019, 07:46 AM   #11
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Re: Framing Under Beam - isolating for sound


Ah, so you did use the flange after all.
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Old 03-19-2019, 11:19 AM   #12
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Re: Framing Under Beam - isolating for sound


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That looks good, but did you put something between wood and concrete?


hmmm.... crap no.
I was only thinking about how much that steal beam vibrates and hum when you hit it. The concrete not so much. But I get what you're saying now and now wish I would have.
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Old 03-19-2019, 11:20 AM   #13
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Re: Framing Under Beam - isolating for sound


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Ah, so you did use the flange after all.


yeah ended up finding a roll at HomeDepot
Was super cheap and figured anything is better than nothing!
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Old 03-19-2019, 11:23 AM   #14
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Re: Framing Under Beam - isolating for sound


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hmmm.... crap no.
I was only thinking about how much that steal beam vibrates and hum when you hit it. The concrete not so much. But I get what you're saying now and now wish I would have.
I have seen lots that are years old with no effect but the rules is never let wood touch concrete, even treated wood as the moisture that can wick up thru concrete will sit in the wood and lead to rot.
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Do not use flat bottom gables with scissor trusses.
https://www.fema.gov/media-library-d...6/chapter7.pdf
figure 7-14
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Old 03-19-2019, 11:25 AM   #15
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Re: Framing Under Beam - isolating for sound


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Originally Posted by spaz View Post
yeah ended up finding a roll at HomeDepot
Was super cheap and figured anything is better than nothing!
That cheap stuff you used is sill gasket, made for going between wood and concrete. oops.
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Do not use flat bottom gables with scissor trusses.
https://www.fema.gov/media-library-d...6/chapter7.pdf
figure 7-14
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