Acoustic Block St. John's NL

Acoustic block, more porous than standard CMU, are designed to absorb, block and/or diffuse sound waves in St. John's.The type of acoustic block that should be used depends on the type of noise and your goal.

Trim Shoppe
(709) 739-0030
445 Torbay Road
St. John's, NL
 
Bilt Right Services Corp
(709) 726-0003
50 Pippy Place
St. John's, NL
 
Atlantic Trusses
(709) 747-2771
20 Corey King Dr
St. John's, NL
 
Kento Ltd
(709) 834-8133
405 Fowlers Road
St. John's, NL
 
Smith's Home Hardware
(709) 364-7525
650 Topsail Road
St. John's, NL
 
Kent Home Improvement Warehouse
(709) 758-2500
10 Stavanger Drive
St. John's, NL
 
Powers Surplus & Salvage
(709) 722-1720
11 Ropewalk Lane
St. John's, NL
 
Smith's Home Hardware
(709) 364-7525
650 Topsail Road
St. John's, NL
 
Trim Shoppe
(709) 739-0030
445 Torbay Road
St. John's, NL
 
Powers Surplus & Salvage
(709) 722-1720
11 Ropewalk Lane
St. John's, NL
 

Acoustic Block

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Source: Masonry Construction
Publication date: September 1, 1998

By Elizabeth Keating

Acoustic block, more porous than standard CMU, are designed to absorb, block and/or diffuse sound waves.The type of acoustic block that should be used depends on the type of noise and your goal. You may want to block a sound, ensure good acoustics in a room, or absorb, block and diffuse all at once. You may need to supplement an acoustic block with other acoustic materials.Highway sound-barriers, school concert halls, lecture rooms -- all require specific sound control. Sounds at low frequencies are some of the most annoying to endure and some of the most difficult to reduce.An STC rating measures a wall's resistance to sound transmission. ASTM E 90 "Test Method for Laboratory Measurement of Airborne Sound Transmission Loss of Building Partitions" stipulates a way to measure sound transmission loss. The National Concrete Masonry Association (NCMA) has a simple formula for estimating STC.The NRC (Noise Reduction Coefficient) is the average of the sound absorption coefficients at four frequencies. A sound absorption coefficient (SAC) is the percentage of sound waves absorbed by the block. NRC is calculated from the SACs at only four frequencies: 250, 500, 1,000 and 2,000 hertz. A table or graph giving sound absorption coefficients at all measured frequencies is much more informative.

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