Sound Reduction Solutions – Noise Bleed Through a Ceiling

The average room is not equipped to protect against noise traveling freely between its ceiling and the floor of the room above. The common contact points connecting the ceiling of one room to the floor of the upper adjoining room serve as mediums through which sound vibrations naturally travel. Sound transmission describes the tendency of sound waves to travel through molecular structures, and is the behavior that must be counteracted in implementing a ceiling soundproofing treatment.

Since sound vibrations can travel through any molecular medium, including air, wood, drywall and metal, ceiling soundproofing treatments must target both air borne and structure borne noise. Noise bleed through a ceiling can be alleviated by the implementation of a treatment that blocks air borne sound waves and forces the collapse of structure borne sound waves, thus preventing noise from traveling through the common surface to become audible in the adjoining room.

Effectively controlling air borne sound transmission involves adding density to the ceiling structure, while structure borne vibrations can be alleviated by establishing a disconnection that forces sound waves to collapse rather than allowing them to transmit through the structure. Adding density to a ceiling is as simple as applying a specialized sound barrier membrane such as dB-Bloc over the surface of the ceiling, taking care to ensure that the entire surface is covered by the material. This heavy vinyl treatment can be affixed directly to a finished ceiling surface, or to exposed ceiling joists in an unfinished ceiling. While adding density serves to block air borne noise, establishing a disconnected ceiling surface is necessary to break down structure borne vibrations that would otherwise escape into adjoining rooms. A set of furring strips attached perpendicular to ceiling joists provides the foundation for a new layer of drywall, which is affixed parallel to the original ceiling surface. The disconnection created by the addition of this second ceiling surface serves to prevent the transmission of sound waves by eliminating the common contact points that would otherwise allow sound to travel directly into the adjoining room.

Necessary ceiling openings which accommodate light fixtures, ceiling fans, speakers and vents present a unique soundproofing challenge. Even with density and disconnection effectively applied to a ceiling, sound waves will naturally travel through such openings if they are left untreated. Specialized sound barrier treatments designed for positioning atop such ceiling openings are available to enhance the effectiveness of a ceiling soundproofing treatment. Because of the specialized nature of soundproofing projects, it is advised to consult with a reputable soundproofing supplier prior to attempting to implement any sound reduction treatment to ensure that all variables of your application are considered.