The perfect classroom is one in which students can clearly apprehend the instructor during the focus and lecture on assignments, projects and tests in an ambiance free of distractions. Here we mention some of the soundproofing challenges faced in classrooms.
• External sound transmission into the classroom. A classroom left untreated will not only enable the sound to escape, but will enable the transfer of external noise into the classroom. Audible external noise can be a huge distraction and interfere with the quality of any learning ambiance. Moreover, extreme external noise like students in the hallway or outdoor construction can eradicate the ability of a teacher to communicate efficiently with the students in the class.
• Various hard and reflective surfaces: Most of the soundproofing challenge arises from a problem common to most classrooms are desks and a ceiling, presence of walls, each of which reflects sound waves back into the room. As a teacher delivers a lecture, a part of the sound waves created by his or her voice reflects from the various hard surfaces in the room, a behavior called sound reflection. Echoes delivered back into a classroom interfere with the desired sound, and is therefore one of the sound wave behaviors targeted in soundproofing a classroom.
• Multiple voices in the room. Students can strengthen vital basic skills by working with a partner or team on a project, but a noisy classroom ambiance can make the group work harder. With various people speaking simultaneously, a jumble of voices reflect from the hard surfaces in the classroom, and the resulting echoes interfere with audibility all over the room. Enhanced noise levels are aggravated as the students speak more loudly to be hard.
To prevent external noise from entering and to prevent echoes created in a classroom, Warren noise control treatments should target both sound reflection and sound transmission. Now let us have a look at how each of these sound behaviors can be facilitated in a classroom ambiance.
• Sound transmission control: Eradicating noise transmitting in from outside a classroom and vice versa involves isolating the room like the ability of sound waves to transmit through the ceiling and the wall is compromised. Sound waves travel conveniently through the common contact points, like the walls and studs surrounding the classroom. Adding thickness is frequently achieved by covering walls completely with a heavyweight vinyl soundproofing membrane like a dB-Bloc. Once the enhanced thickness is established, a set of horizontal furring strips affixed to the wall creates a base for a new layer of drywall that will create the second wall surface. This separation forces external sound waves to collapse in the space between the two surfaces instead of transmitting directly into the classroom, and also works to safeguard adjacent classrooms from sound transmitting out of the treated room.