Sound proofing

[Rp19]

Any suggestions for the sound proofing of my attached garage?

The exterior wall of the house is 4" thick with drywall on one side and plywood on the other, basement is roxul main floor is fibreglass.

One thought is to build a 2x4" wall in the garage with roxul insulation and a sound dampening drywall. It does eat up space and brings my cabinets 2'11 from the hoist

The other thought is just a sound dampening drywall mounted right to the plywood, I'm not sure it's rated to do that and remain effective. That gives me 3'3" space between cabinets and hoist. Resilient channel won't work because I'm going to be mounting cabinets on the wall

I'm not sure I should even worry about sound proofing as my girlfriend and kid slept though a wood chipper running in the driveway a few feet from the house lol

 

[ItsNemo]

What sounds in the garage are you trying to block exactly? Strategy and expectations will change depending on what it is.

 

[DCarr2]

Sounds like possibly the screams from his victims

 

[matt_i]

Imo you are on the right track with Roxul and even a double-thickness of drywall will help without adding much thickness. Sound pressure has to vibrate something which then transmits energy to something else. Adding mass and damping will both help.

 

[MovingAlong]

Seal everything too, garage should be airtight. Check this guy out:

You may not be building a recording studio, but the principles still apply.

 

[Rp19]

Sounds like possibly the screams from his victims

Maybe

also compressor and impact. Music and the occasional swearing when things go wrong. Three out of four bedrooms share that exterior wall

 

[tymbo]

Seal everything too, garage should be airtight. Check this guy out:

You may not be building a recording studio, but the principles still apply.

That guy has some great videos

 

[e36jon]

I had an interior wall that's shared with a neighbor (San Francisco 'Row House') that was getting shelves. I left the existing drywall in place and added a single layer of 5/8" with 'Green Glue' between it and the existing, then their caulk at all joints and borders.

It definitely helped (3+ db), but, I can still hear their stereo and TV when I am in that room. A layer of Roxul 'Safe N Sound' wouldn't have fixed the problem, but would have helped a bit more. If I had torn off the existing sheetrock I would also have added a layer of mass damped vinyl, then used two layers of 5/8" (Existing is 1/2"). With all of that I think I might have been 'good enough'.

I didn't watch the linked video earlier but know that this is a tricky game. Sound is sneaky in how it will propagate through your structure and will happily do an end-run around all of your improvements if you don't actively stop it.

Good luck!

Jon

 

[kd3pc]

a second "wall" framed on the same center distance, but opposite the current stud, with an inch or two of dead space between them. Still roxul both...just no physical contact between the two.

work wonders, even for those high frequency screams..

 

[ForceFed70]

Sound channel. It's one of the most effective ways and it's cheap. Roxul safe and sound (not the regular batts) will help but sound channel will work better.

The absolute best method for soundproofing a wall involves a stagger studded 6" wall (2x4 studs), roxul safe and sound, and 2 layers of drywall separated by sound channel. From what I've seen, the noise reducing drywall is expensive and not very effective but couldn't hurt.

That type of wall is quite an investment however. If the wall is already up and covered with plywood. I'd be very tempted to install sound channel and a layer of drywall and call it a day.

 

[Rp19]

Sound channel. It's one of the most effective ways and it's cheap. Roxul safe and sound (not the regular batts) will help but sound channel will work better.

The absolute best method for soundproofing a wall involves a stagger studded 6" wall (2x4 studs), roxul safe and sound, and 2 layers of drywall separated by sound channel. From what I've seen, the noise reducing drywall is expensive and not very effective but couldn't hurt.

That type of wall is quite an investment however. If the wall is already up and covered with plywood. I'd be very tempted to install sound channel and a layer of drywall and call it a day.

Sound channel won't work, I need to mount cabinets on the wall and that will bypass the effectiveness of the channel.

The garage is being built off the house so there is the exterior wall of the house which is the plywood wall. I'm thinking I will build a 2x4" next to it with an air space and roxul with regular drywall

 

[ard]

That guy has some great videos

Interesting...but that "PRO Level" **** at the beginning reminded me of the FOS "We are Professional Grade' in the GMC commercials

 

[Nowater]

IMO the best bang for the buck is to put up another layer of drywall on the garage side. The 5/8 " fire rated would be a safe bet. Adding the extra mass cuts some of the sound and if the tape job on the garage side is not perfect, well it is a garage.

I did not see where you said if electrical receptacles share the common wall, and if they do they are a source of sound transmission.

Did you say if a door is in this wall and mention anything about the weight, construction, and weatherstripping on any door?

Consider the ceiling joist layout and if they run through the garage and into the next rooms. If so, they can also transmit a lot of noise. First thing to do may be to install blocking at the common wall, and then perhaps another layer of drywall. Is that ceiling accessible and or insulated?

 

[ddawg16]

Sound channel. It's one of the most effective ways and it's cheap. Roxul safe and sound (not the regular batts) will help but sound channel will work better.

The absolute best method for soundproofing a wall involves a stagger studded 6" wall (2x4 studs), roxul safe and sound, and 2 layers of drywall separated by sound channel. From what I've seen, the noise reducing drywall is expensive and not very effective but couldn't hurt.

That type of wall is quite an investment however. If the wall is already up and covered with plywood. I'd be very tempted to install sound channel and a layer of drywall and call it a day.

Pretty much on task

The key is you have to 'de-couple' the walls so sound doesn't get through.

The more solid the wall is, the more sound gets through. If you really wanted it quiet....build a new wall NOT touching the existing wall.

 

[Kaizen]

I had an interior wall that's shared with a neighbor (San Francisco 'Row House') that was getting shelves. I left the existing drywall in place and added a single layer of 5/8" with 'Green Glue' between it and the existing, then their caulk at all joints and borders.

It definitely helped (3+ db), but, I can still hear their stereo and TV when I am in that room. A layer of Roxul 'Safe N Sound' wouldn't have fixed the problem, but would have helped a bit more. If I had torn off the existing sheetrock I would also have added a layer of mass damped vinyl, then used two layers of 5/8" (Existing is 1/2"). With all of that I think I might have been 'good enough'.

I didn't watch the linked video earlier but know that this is a tricky game. Sound is sneaky in how it will propagate through your structure and will happily do an end-run around all of your improvements if you don't actively stop it.

Good luck!

Jon

I've tried several methods including spray foam and double 5/8 drywall. The above was the best I have found. I caulked all the penetrations in the wall and for larger voids I put in canned spray foam. The wall was only 2x4 so I firred it out to 2x6 and put in the safe and sound. I did it in stages to see if I needed more. I did 2 layers of 1/2 drywall making sure I filled the joints not just taped. I had the green glue on hand if I needed a 3rd layer but I didn't.
OP also remember when you then add the plywood and cabinets they will act as attenuators transmitting the sound through the studs. PITA but might try some kind of rubber washer between the wall and cabinets.

 

[Falcon67]

Look for "Quiet Brace" 4x8 sheets. They are made to help kill sound. I have a 3.5 HP compressor behind a 1 1/2" thick wall that has some insulation, the a layer of Quiet Brace, then a layer of OSB. Kills the compressor sound very well.

 

[Slednut]

Most of the office buildings around here use Rockwool.