Los Angeles, California
Noise Monitoring Services


Sound Transmission (FSTC, NIC) and Impact (FIIC) Testing

Noise Monitoring Services provides building acoustic testing services. Our acoustical consultants are experienced in the measurement and prediction of sound and impact ratings. We can perform the following tests:

  • FIIC tapping tests to determine Impact Isolation Class of floor-ceiling assemblies. This test is performed using a standard tapping machine, which drops small hammers on a floor at a rate of 10 per second from a height of 40 mm. The sound level is measured in the room below in the frequency range 63 Hz to 8 kHz to determine the FIIC rating. This type of test requires access to the upper and lower units.

 

  • NIC/FSTC sound tests to determine the acoustical rating of walls and floor-ceiling assemblies. The test is performed by playing white noise through speakers at a high level on one side of a wall. The sound level is measured on both sides of the wall in 1/3rd octave bands and the Field Sound Transmission Class (FSTC) or Noise Isolation Class (NIC) rating is calculated by subtracting one set of data from the other. Access is required to units on both sides of the wall to be acoustically tested.

 

  • Noise Criterion (NC) testing. This is a background noise test performed to determine whether a room is suitable for the use for which it was designed. A 1/3rd octave band spectrum noise measurement is obtained and the data fitted to an NC curve. The resulting NC level is compared to recommended ratings for the room use.

 
All testing is performed by experienced acoustical engineers to the required ASTM testing standards. We will provide test reports showing the measured frequency spectra and calculated STC, NIC or FIIC ratings.

Call us today to book a testing appointment.

In addition to our acoustic testing services, we can:

  • Predict STC and IIC ratings prior to construction.

 

  • Review building plans and sections to verify proposed construction will meet code requirements.

Acoustic tapping testing