Sound Control for Doors & Doorways
Flanking sound transmission at entrances & doors
SOUND CONTROL for DOORS - CONTENTS: Building noise & sound control measures at entrances & doors: door flanking sound interception. Design details for soundproof doors and doorways. How to make a building quiet: sound isolation strategies.
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Door noise or sound transmission control:
This article explains how to make sound-reducing or "soundproof" doors and doorways in buildings. A key component in noise control and sound privacy improvements is the elimination of flanking pathways at entrances or doors as well as using doors that themselves are resistant to sound transmission.
A closet door may form a sound flanking pathway, while a hollow-core entry door may readily transmit noises outside of a room, violating privacy or creating a noise nuisance.
Soundproof double-door doorways: Upgrade to solid-core doors and add weather-stripping. Our photo (left) shows an installation of doubled solid core doors that has been found effective in minimizing sound transmission between a counseling office and its waiting room.
Similar to the double sound-transmission resistant doorway shown at the top of this page, here the designer incorporated a short hallway between a waiting room and the counseling office.
Outside a waiting room closet, forming one wall of the entry hall, provides additional soundproofing and privacy for this space. As we discuss below at SOUND CONTROL for WALLS, closets provide additional sound transmission buffering provided their doors are solid, not louvered.
Addressing obvious flanking paths is often the most cost-
effective step in soundproofing a home.
Strategies such as
sealing air leaks between rooms, upgrading doors, and adding
weather-stripping may provide adequate sound isolation
without the need for more exotic and expensive measures.
Soundproof single door with glass panel
Above we illustrate a sound-proof door installed on a music classroom at Vassar College. The frame of this soundproof door with its large glass center panel is filled with sound deadening materials and as you can see in the close-up photo (above right) additional steps to reduce sound transmission through the door or its jamb were taken by spacing, glass type, and sound-absorption into the door frame.
In general, sound-resistant doors should be within 10 Sound Transmission Class (STC) points of
the surrounding wall. Solid-core doors are recommended
for bedrooms and bathrooms.
Where higher-level sound
isolation is required, you will need to add high-quality
gasket-type weather-stripping and a sealed threshold.
the gap between the door jamb and studs should be
caulked or grouted to avoid sound leaks around the door.
You can see from the table "Sound Transmission of Interior Doors" that the example in our photo above, two solid core doors spaced 3-inches apart gives the best STC rating in both unsealed and well sealed installations.
Building noise control - flanking pathways: this article series explains how sound flanking paths, sound leaks around and through building components, defeats incomplete attempts to reduce building sound transmission and noise levels. We include design details for sound reducing details in buildings including soundproof office doorways and doors.
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