From loud neighbors and pets to the sounds of traffic and early morning construction work, living in a city or in close proximity to your neighbors can invite a variety of noise pollution into your home. Fortunately, installing sound insulation can help dampen noise that disrupts your home's peace and quiet. The guide below addresses some of the most commonly asked questions about acoustic insulation.

A Guide to Acoustic Insulation

How does acoustic insulation work?

Sound insulation is a special type of insulation that reduces the transfer of noise between the inside and outside of your home. Although it looks and functions similarly to thermal insulation and retains the ability to prevent some heat transfer, the acoustic variety is thicker and denser, absorbing sound waves before they pass through the interior and exterior walls of your home. 

What are the benefits of home sound insulation?

Over time, outside noise can begin to disrupt your lifestyle, especially if sounds including loud music or barking dogs continue throughout the night and lead to repeated loss of sleep. Losing quality sleep can have a negative impact on your mood and memory and even lead to poor decision-making. Sound insulation dampens outside noise that would otherwise interrupt those working or studying during the day as well, allowing you to carry on with your normal routine.

Where can insulation be installed?

sound insulation

Acoustic insulation can be added to the walls, floors, and ceilings of your home. When determining where this insulation should be placed, consider the two main types of noise: airborne and impact. Airborne noise occurs when sounds travel through the air, like cars honking or a TV blaring. Stopping airborne noise will require a barrier or sound insulation system in your walls between you and the source. To reduce impact noise, such as footsteps or home renovation work, consider adding acoustic insulation to your ceiling and floor.

How is sound transmission measured?

Sound Transmission Class (STC) is a number rating that describes how well a building partition, such as a wall or floor, resists the passage of airborne sound. The higher the number, the better the sound insulation performance. STC ratings range from 25, where normal speech is understandable, to 50+, where loud speech cannot be heard. Keep in mind that STC does not account for low frequencies, so it should not be the only standard used to measure the efficiency of a sound insulation product.


If your home is filled with disruptive outside noises, turn to Alas-Co General Construction for effective sound insulation solutions. For over 30 years, their skilled team has used state-of-the-art materials and industry standard techniques to stop excess sound from entering the homes of Anchorage, AK. They also specialize in fiberglass and spray foam insulation to prevent the transfer of heat. For a full list of residential insulation services, visit their website. Call (907) 522-2297 to request a free estimate.