Barrier Materials for Soundproofing Walls & Ceilings
Barrier material installed on the underside of the joists can be used to control sound from transmitting through the floor / ceiling structure.
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Absorptive material is installed in the spaces between the joists. Generally, 4 to 6 inches of fibreglass like Roxul Safe N Sound or mineral wool is sufficient. This will prevent resonance in the cavities between the joists. Plain or decoupled barrier material like NoiseBlok is then applied to the underside of the joists. Drywall can be installed directly over the barrier material or in combination with the Resilient Sound Isolation Clip System.
Note: For heavy foot-fall or mechanical contact noise that is being produced on the upper floor, additional treatments may be required to decouple the finished floor. Please see QT-4005 and Duracoustic Floor Underlayments for more details.