When it comes to soundproofing, we've got the skinny on all the options after relentless researching. However, whether or not these options will ultimately create the silent oasis we're after is a matter of installing the soundproofing and cranking the music next door to test it all out. An expensive and labour-intensive gamble, but the only way to know for sure.
First, we cut away the plaster and mortar to get straight to the brick. Had there been lathing, we could have worked right over the wall as-is, but alas, there was not. What there was was a layer of mortar mixed with horse hair to keep the wall together, then a layer of paper over that. This indicated we'd need a wood frame to act as our base.
We purchased the following to do the job thoroughly:
1" x 2" wood to make our wood frame overtop the brick and mortar
Resilient channels to affix horizontally to the frame
Sonopan boards to deaden the sound (will go into detail about this and resilient channels)
Drywall sheets
Acoustic sealant
We loaded up the car after 45 minutes of tying down in the 30+ heat and humidity with a very unhappy baby (we aren't engineers, but we figured it out. Lets hope we are faster at our reno's than we are at tying down supplies to our roof rack), and got it all there in one piece. Total cost for the materials: $4 per resilient channel at 12' per piece, $14 per sheet of drywall, $2.50 per 1" x 2", $5 for the acoustic sealant, and $25 per sheet of Sonopan.
Here's how its done: we first affix out wood framing to the existing wall. It was suggested we use a cartridge hammer, which we purchased for about $30, plus the bullet-like cartridges. These sound like gunshots when hammered, and for good reason, as each cartridge contains gunpowder and shoots the nail into the brick and mortar. Since there are just the two of us plus the baby, I took the babe out on the lawn while D got to slam away with the "gun". The frame runs along the top and bottom of the wall with 16" between each stud, just as you would build a wood frame wall.
Next goes on the
resilient channel. These are metal channels with a zigzag shape that screw into the studs horizontally starting 2" from the bottom, 6" from the ceiling, and 16" in between each. These channels sit up from the wall 1/2", and work to absorb sound vibrations and dissipate it. We were told and read that this, plus drywall, should do the trick. But to be ultimately successful, we decided to add to this the
Sonopan. Sonopan is made by a Quebec company, and is a completely non-toxic fibreboard made with 100% recycled and recyclable materials, using starch, wax, and a natural wood resin as binders. No gloves or masks are apparently necessary to use this material. AND, Sonopan was found in a study to be more effective, acoustically, than Enermax. We were sold.
The Sonopan boards will be installed under the drywall along with the resilient channels to absorb the sound vibrations, at which point we will test it all out before we begin mudding and taping. The acooustic sealant will be used in all the corners and edges, as these are where the sound can escape if overlooked. We're very confident this will cut our noise issue effectively, but we have an expensive but easy back up plan if not. If we find the noise just hasn't reduced enough, we will then add the Quietrock at $100 per sheet. We'd obviously prefer to avoid this, which is why we've added the Sonopan. But as a last resort, the Quietrock can be installed over the drywall, then mudded and taped just as we would the drywall.
We are part way through this installation, and with the help of Grandma watching over the babe, we'll plow through the rest this weekend. Photos will follow of each step, for those of you who may find it helpful.
On an aside: we have also discovered that not all of the previous owners of the house have vacated. See below:
We've found three of these, which are the Brontosauruses of cockroaches. We are looking for non-toxic options of killing these things off, if such a thing exists. We are concerned that fumigation will harm our child, and ourselves. Yet these unwanted residents MUST go. Ugh.