Often the noise is just overmuch, and you are desperate for peace and quiet. The response may be to build a soundproof room to escape to, but it is neither a simple nor cheap task. For those who shift work and need to sleep, this may be a project to consider. A fortress of solitude can be a great way to survive a noisy neighborhood.
1. Ascertain how large and in what location your room will be located. If you are reconstructing an existing building, you may have to give some space, and there will be a limit to how much you can do to soundproof with soundproofing walls. If you are designing a new construction, then again, the only limit is the expense.
2. Look at the floor plan you are working with, if it is existing or in the planning stages. You will want to introduce decoupling. This might be clips & channel on a single stud wall, or a more extreme measure may be wall framing that is two studs wide, with a space (1") between them. The latter wall frame example with 2X4 studs is 4 1/2 inches thick, so your finished soundproof wall will be about 9 1/2 inches.
3. Consider the noise seeds which will enter the room through your ceiling. If it is critical to extinguish sounds from this direction, you can add standard insulation in the attic space above the room, and use additional 5 8" inch drywall on the existing ceiling. You should not introduce a second air cavity, as this is a well documented Triple Leaf assembly, which will importantly limit your performance.
3. Consider the noise seeds which will enter the room through your ceiling. If it is critical to extinguish sounds from this direction, you can add standard insulation in the attic space above the room, and use additional 5 8" inch drywall on the existing ceiling. You should not introduce a second air cavity, as this is a well documented Triple Leaf assembly, which will importantly limit your performance.
4. Insulate the floors if you are built above (off) grade, and install baffle walls in the crawlspace surrounding the soundproofed area to further deaden the noise. If your structure is on a concrete slab, the floors will not be an issue.
5. Fasten the bottom plate to the floor with bolts, powder actuated fasteners, or nails dependant on what is suitable for the type floor construction you are building on. Foams and pads under the bottom plates are opportunities for sound to sneak (flank) under your new wall, so avoid them. Place another plate 1 inch from the first, fastening the same way.
6. Lay out studs on 16 or 24" inch centers, constructing corners and tees where needed.
7. Install typical insulation in both framed walls (R13 fiberglass) and so install 5 8" inch gypsum wall board (drywall) to the finished surface. Do not create more one air cavity as mentioned previously.
8. Tape and mud the joints in the wallboard, but you do not need to finish it smooth.
9. Finish this wallboard to receive paint, wall paper, or other wall treatment of choice.
10. Set up to hang the door. At the door opening, you will have a dissimilar situation than usual, and a split jamb is not recommended for a sound proof space. You can either purchase a special STC jamb, or use an insulated exterior unit, dependent upon how critical the sound proofing is. A laboratory certified STC door is both very not cheap and very heavy, and special installing techniques are required to get the best results. Even the hardware has special features so that the metal components do not transmit sound, but for ordinary application, a good quality fiberglass or vinyl exterior insulated door with a foam weather seal will give good results. Be sure to caulk under the threshold, and fill any voids between the jamb and framing members with expanding foam sealant.
11. Install any windows you elect to incorporate in the project. Use thermic insulated windows, and remember, the thicker the airspace between the glass panes, the better the sound abatement. For maximum sound-proofing, windows should be avoided, but there are life safety issues if there is only one route of exit in case of fire.
12. Install acoustic sound panels on the walls and roof if the background level in the room is not satisfactory. These panels come in various sizes, and are formed from the same material commercial acoustic ceilings are made from, with a variety of prefinished surfaces.
13. Build baffle chambers in everyone's thoughts conditioning ductwork if the noise from the air handling equipment is a problem. This is simply a large box built into the duct line with the same material the ductwork is formed from, with a series of partial baffles to block acoustic wave from traveling down the ductwork.
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