Can Adding Extra Drywall Improve Soundproofing?

Adding extra drywall can indeed enhance the soundproofing of your space. When properly installed, multiple layers of drywall can significantly reduce sound transmission across walls, making your environment more peaceful and private.

Enhancing Acoustic Performance with Multiple Layers

The acoustic performance of drywall can be greatly improved by adding layers. According to experts, multiple layers significantly increase the wall's ability to block sound. However, for optimal performance, it is suggested to include an air gap between the layers. This gap serves as a natural barrier, further enhancing the wall's soundproofing capabilities.

Products with Higher STC Ratings

There are market products that offer considerably higher Sound Transmission Class (STC) ratings. For example, Quiet Rock is known to provide the acoustic equivalent of up to ten layers of drywall. Adding this product can significantly improve the soundproofing quality of your space without the need for additional layers.

Improving Low and High Frequencies

Adding layers of drywall can not only improve low-frequency sound but also high-frequency sounds. Typically, using even four layers of fire-rated drywall is standard for achieving multi-hour fire ratings. To further enhance the acoustic properties, it is better to install the second layer on spacers. Metal Z-spacers are preferred as they can improve both low and high sound transmission. Additionally, using flexible caulk at the floor and ceiling connections can seal these areas and further improve sound isolation.

Meeting Fire Standards and Aesthetics

Adding a layer of drywall not only improves soundproofing but also helps meet fire standards. Canadian fire standards require ceilings in buildings with residents above to have a minimum of 5/8 inch fire resistive drywall or two layers of half-inch drywall. This not only ensures better soundproofing but also provides a chance to select a finished type of drywall, such as vinyl-covered, for enhanced aesthetic appeal.

Best Practices for Maximum Impact

While adding extra drywall is beneficial for soundproofing, there are specific steps you can take to achieve the best results:

Tear Down and Seal: Tear down the drywall layer on one side of the wall and add acoustical caulking to seal all gaps between the drywall and the framing. Insulation: Add acoustical insulation to fill the air gap between the drywall layers. Resilient Channels: If the framing is made of solid-wood studs, install resilient channels to the exposed sides of the studs. Resilient channels are not required if the framing is made of lightweight steel studs, as the flanges can act as flexible springs. Double Layers: Install one or two layers of drywall onto the resilient channels. Two layers are better but ensure that the joints of the outer layer are not aligned with those of the inner layer.

Conclusion

For those seeking to improve the soundproofing of their space, adding extra drywall is an effective method. By understanding the proper installation techniques and utilizing recommended products, you can make your room more peaceful and enhance your overall living experience.