Reduce Outside Noise With a Sound Barrier Fence

It is not hopeless, though. With the right mix of soundproofing and sound absorption products and a few clever techniques, unwanted outdoor noise can be controlled or eliminated so your outdoor space can finally deliver on its promise. The most effective single tool for the job is a sound barrier fence.

Acoustics uses two distinct techniques, and their names cause most of the confusion. Soundproofing, also called sound blocking, creates a shield so unwanted sound cannot pass through. Sound absorption, also called sound control, uses soft materials to soak up echo and reverberation. Outdoors, the priority is sound blocking, since the goal is to keep the neighbor's air conditioner or the highway out entirely. Absorption then cleans up the echo and the noise you make yourself.

Before choosing a product, it helps to understand what turns an ordinary fence into a barrier that works. Four factors decide almost everything.

A barrier does nothing until it breaks your line of sight to the noise source. As a rule of thumb, once the fence blocks that sightline you gain roughly 5 decibels of reduction, and about another half a decibel for every foot you add above it. For street and traffic noise, that usually means a solid fence at least 6 to 8 feet tall. The taller the barrier relative to the source, the better.

Sound is blocked by mass. The heavier and denser the material, the more noise it stops, which is why a thin wood fence does little on its own and a concrete wall does a lot. It is also why adding a dense layer such as mass loaded vinyl to an ordinary fence is so effective: you get the noise performance of a much heavier wall without building one.

Sound leaks like water. A single gap between boards, or a few inches of daylight under the fence, will undo most of your effort. Overlap or seal every joint, fit the boards tightly, and run the barrier all the way to the ground. On a noise fence, airtightness matters as much as material.

Put the barrier as close as you can to the noise source. Wrapping a pool pump or an AC compressor right at the unit beats a distant fence every time. If you cannot get close to the source, the next best option is to place the barrier close to the area you actually want to keep quiet.

Not all fences are built to block sound, and the material you start with sets your ceiling. The table below compares common options by their approximate Sound Transmission Class, where a higher STC means more noise blocked. The biggest gains come from adding mass to whatever fence you already have.

The takeaway: mass and a tight seal beat everything. A standard fence upgraded with mass loaded vinyl or lined with exterior barrier blankets will outperform a taller but hollow fence, and it costs a fraction of a masonry wall.

As a more elegant alternative to exterior blankets, AudioSeal® Mass Loaded Vinyl (MLV) Soundproofing Barrier can be sandwiched between two layers of fencing to add serious mass invisibly. Mount the barrier to the existing fence roughly every 12 inches, starting along the top edge and working down, then screw the outer planking tight over it so the finished fence looks completely ordinary while performing far better.

As this is an exterior application, you should also consider using AudioSeal® Reinforced Sound Barrier since it is resistant to shrinking, rotting, adverse environmental conditions, and UV light.

Typical Configuration: Planks / Barrier / Posts + Horizontal Studs / Planks

AudioSeal® Barrier on Fence

Completed composite fence structure

Blocking handles the noise coming in; absorption cleans up echo and the sound you generate yourself. On a covered porch or patio you can mount AlphaSorb® Fabric Wrapped Acoustic Panels on walls or the ceiling, and even softer touches like outdoor rugs and fabric-covered furniture help take the hard edge off the space.

If you have no fence, or a fence that cannot hold acoustical materials, a few natural approaches can still take the edge off outdoor noise.

A green barrier is a fence made of plant life: dense shrubs or a staggered run of trees and shrubbery. Plants are nowhere near as effective as mass loaded vinyl, but any mass between you and the noise helps, and foliage adds a genuinely biophilic, calming atmosphere to the yard.

Part of the appeal of a fountain is its ability to mask noise. The bubble of a fountain, waterfall, or small pond is one of nature's most pleasant sounds and covers less welcome ones. Even a single fountain, or a bird bath that draws splashing birds, helps mask intrusive noise from beyond the yard.

Landscaping choices matter too. Instead of gravel or concrete in beds and pathways, choose mulch; the softer material absorbs sound rather than reflecting it the way hard surfaces do.

If you are adding a shed, a play structure, or similar, place it between your seating area and the noise source. Since the structure is going in anyway, positioning its mass to block sound is a free win.

Cost depends on how you add the mass. Retrofitting an existing fence is the budget route: exterior barrier blankets are sold by the individual blanket or by the roll in standard sizes, and mass loaded vinyl is priced by the square foot, so a typical DIY fence upgrade runs into the low hundreds to low thousands depending on fence length.

A full purpose-built acoustic fence costs more, but all of these sit well below a poured concrete or masonry wall, which is why most homeowners retrofit.

Because sizing is application-specific, Acoustical Solutions quotes these by project; browse the sound barrier product range or request a quote for exact pricing.

Two quick examples of how this plays out in practice.

Solving outdoor acoustic problems is what we do, and there is nothing more satisfying than the peace that good acoustics bring to a space. With the right modern materials and a sound approach to height, mass, and sealing, a quiet backyard is very achievable.

To put together the right sound blocking and sound absorption plan for your yard or patio, reach out to our team today or call an Acoustical Sales Consultant at 1-800-782-5742 to get started.