How to Soundproof a Room

Whether it’s a bedroom beside a busy road, a home office where you need some peace and quiet, or a room where noise is travelling to the rest of the house, soundproofing can make a significant difference.

But how can you soundproof a room effectively? Proper soundproofing involves more than simply adding soft furnishings or acoustic panels. To significantly reduce sound travelling into or out of a room, you need to consider the walls, ceiling, floor, doors and any gaps through which noise can pass.

Here’s what you need to know about how to soundproof a room, including the materials required and whether you should tackle the project yourself or call-in professional installers.

How Does Room Soundproofing Work?

Sound travels through the air and through the structure of your home. When sound waves reach a wall, floor or ceiling, some of that energy can pass through to the adjoining space.

Effective soundproofing aims to reduce this transmission. One of the most practical ways to achieve this during construction or renovation is to install dense acoustic insulation inside wall, ceiling and floor cavities.

Acoustic insulation batts are specifically designed to absorb sound and reduce noise transfer. Compared with standard thermal insulation, acoustic products are generally denser and are particularly useful in internal walls and between floors.

It’s important to distinguish between soundproofing and improving a room’s acoustics. Acoustic panels, rugs and curtains can help reduce echo within a room, but they won’t necessarily prevent significant amounts of sound travelling through a wall. If your objective is to stop noise transfer, the construction of the wall, floor or ceiling needs to be addressed.

What Materials Do You Need to Soundproof a Room?

If you’re wondering “how can I soundproof a room?”, acoustic insulation is a good place to start.

Pricewise Insulation offers a wide selection of acoustic insulation designed to reduce noise transfer within Australian homes.

Popular options include Knauf Earthwool Sound Shield Wall Insulation Batts, which are specifically designed to reduce noise transmission between rooms and from outside the home.

Another option is Bradford SoundScreen Acoustic Insulation, a high-density acoustic insulation available in different thicknesses and R-values to suit different wall cavities.

For DIY projects, Jeanius Denim Insulation Batts can also be worth considering. Denim Insulation is itch-free and easy to handle, making it particularly appealing to homeowners undertaking their own installation.

Depending on the project, you may also require plasterboard, loaded vinyl, acoustic sealant, appropriate fixings, a suitable cutting tool, measuring equipment and personal protective equipment.

How Can Loaded Vinyl Improve Room Soundproofing?

For rooms where greater sound reduction is required, loaded vinyl can be used alongside acoustic insulation to create a more comprehensive soundproofing system.

Loaded vinyl is a dense, flexible material designed to add mass to walls, ceilings and floors without taking up the space associated with much thicker building materials. This additional mass helps reduce the amount of airborne sound that can pass through the building structure, making loaded vinyl particularly useful when trying to limit voices, music, television noise and other sounds travelling between rooms.

While acoustic insulation batts primarily help absorb sound energy within wall, floor and ceiling cavities, loaded vinyl provides an additional barrier to sound transmission. The two products can therefore complement each other: acoustic batts are installed within the cavity, while loaded vinyl can form part of the wall, ceiling or floor assembly.

For example, someone investigating how to soundproof a room could combine high-density acoustic insulation with loaded vinyl and suitable plasterboard rather than relying on one material alone. Careful installation is important, as gaps, poorly sealed joins and other weak points can reduce the effectiveness of the overall soundproofing system.

How to Sound Insulate Inside a Room

If you’re renovating and have access to the wall or ceiling cavities, installing acoustic insulation can be a relatively straightforward project for a confident DIYer.

Step 1: Identify Where the Noise Is Coming From

Before buying materials, determine how sound is entering or leaving the room.

If the problem is voices or television noise from the room next door, prioritise the adjoining wall. Traffic noise may require attention to external walls, windows and doors. Footsteps or voices from upstairs may require acoustic insulation between floors.

Understanding the source prevents you from spending money soundproofing areas that aren’t responsible for the problem.

Step 2: Measure the Area

Measure the height and width of the walls, ceiling or floor you intend to insulate and calculate the total square metreage.

You should also check the spacing and depth of the timber or steel framing. Acoustic batts are available in different widths and thicknesses, so choosing the correct size will make installation considerably easier.

Step 3: Choose Your Acoustic Insulation

Select an acoustic insulation product suited to the cavity and level of sound reduction required.

Higher-density acoustic batts are designed specifically to reduce sound transmission. If noise reduction is a priority, choosing dedicated acoustic insulation rather than standard thermal wall batts will generally provide a better solution.

You can shop Pricewise acoustic insulation to compare the available options.

Step 4: Install the Insulation

Fit the acoustic batts snugly between the studs, joists or other framing members.

Avoid leaving unnecessary gaps, as sound can exploit weak points in the barrier. At the same time, don’t excessively compress insulation into a cavity that is too small for the product.

Batts may need to be carefully cut around electrical cables, pipes and other obstacles so the insulation continues to fill the available cavity.

Always follow the manufacturer’s installation instructions and relevant safety requirements, particularly when working around electrical services.

Step 5: Address Other Sound Leaks

Learning how to sound insulate inside a room also means looking beyond the insulation itself.

Doors, windows, vents and gaps around the edges of walls can all allow sound to travel. Sealing unnecessary gaps and improving poorly sealed doors or windows can complement the acoustic insulation installed within the building structure.

Step 6: Reinstall the Plasterboard

Once the insulation is fitted correctly, the wall or ceiling lining can be installed.

For projects where a higher level of sound isolation is required, specialised acoustic plasterboard, loaded vinyl, additional plasterboard layers and acoustic sealants can form part of the overall soundproofing system.

Should You Soundproof a Room Yourself?

The biggest advantage of DIY installation is cost. If you’re already renovating a room and the wall cavities are exposed, installing acoustic batts yourself can save on labour costs.

It also gives you control over the project, and insulation batts are relatively straightforward to install when you have unobstructed access to the framing.

However, DIY soundproofing has limitations. Retrofitting insulation into an existing finished room may require plasterboard to be removed, and mistakes such as leaving gaps can compromise the result.

There are also situations involving electrical wiring, plumbing or more complex acoustic requirements where professional assistance is advisable.

When Should You Use a Professional Installer?

Professional installation may be the better option if you’re soundproofing a large area, retrofitting an established home or trying to solve a particularly difficult noise problem.

Experienced installers can assess where sound is likely to be travelling and ensure insulation is installed correctly throughout the required cavities. They can also make the job considerably faster when multiple walls, ceilings or floors need attention.

The downside is the additional labour cost. For a straightforward renovation with accessible wall cavities, many Australians may prefer to install the insulation themselves.

What Is the Best Way to Soundproof a Room?

There isn’t one universal answer to how to soundproof a room because the best approach depends on the source of the noise and the construction of the room.

For many Australian homes, however, installing quality acoustic insulation in the relevant internal walls, external walls, ceiling or mid-floor cavities is an excellent starting point.

Combine good acoustic insulation with attention to doors, windows and other potential sound leaks and you can significantly reduce unwanted noise – creating a quieter bedroom, office, living space or virtually any other room in the house.