ASTM-E336 2008

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E336-08 Standard Test Method for Measurement of Airborne Sound Attenuation between Rooms in Buildings

Published By	Publication Date	Number of Pages
ASTM	2008	12

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Categories: 91.120.20 - Acoustics in building. Sound insulation, ASTM

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Description

1.1 The sound isolation between two spaces in a building is determined by a combination of the direct transmission through the nominally separating building element (as normally measured in a laboratory) and any transmission along a number of indirect paths, usually referred to as flanking paths. Fig. 1 illustrates the direct paths and some possible structural flanking paths. Additional non-structural flanking paths may include transmission through common air ducts between rooms, or doors to the corridor from adjacent rooms.

1.2 The main part of this test method defines procedures and metrics to assess the sound isolation between two rooms in a building separated by a common partition including both direct and flanking transmission paths. Appropriate measures and their single number ratings are the noise reduction (NR) and noise isolation class (NIC), the normalized noise reduction (NNR) and normalized noise isolation class (NNIC), and the apparent transmission loss (ATL) and apparent sound transmission class (ASTC). With the exception of the ATL and ASTC under specified conditions, these procedures are only applicable when both room volumes are less than 150 m ³ .

Note 1The word partition in this test method includes all types of walls, floors, or any other boundaries separating two spaces. The boundaries may be permanent, operable, or movable.

1.3 Annex A1 provides methods to assess the sound transmission through a partition or partition element with the influence of flanking transmission reduced. These methods may be used when it must be demonstrated that a partition has achieved a specified minimum sound attenuation. The results are the field transmission loss (FTL) and field sound transmission class (FSTC).

1.4 Annex A2 provides methods to measure the sound isolation between portions of two rooms in a building separated by a common partition including both direct and flanking paths when at least one of the rooms has a volume of 150 m ³ or more. The results are the noise reduction (NR) and noise isolation class (NIC).

1.5 This standard may involve hazardous materials, operations, and equipment. This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

FIG. 1 Direct (D) and Some Indirect or Flanking Paths (F and Dotted) in a Building

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PDF Pages	PDF Title
1	Scope
2	Referenced Documents Terminology FIG. 1
3	Summary of Test Method Significance and Use
4	Test Equipment Calibration and Sensitivity Checks Test Site Conditions
5	Room Selection Sound Sources TABLE 1
6	Measurement of Average Sound Pressure Levels
7	Calculation of Acoustical Quantities and Associated Metrics Report
8	Precision and Bias
9	Keywords A1. MEASUREMENT OF FIELD TRANSMISSION LOSS A1.1 Scope A1.2 Significance A1.3 Summary of Procedure A1.4 Required Conditions
10	A1.5 A1.6 Shielding Room Surfaces A1.7 Unshielded Measurement of Apparent Transmission Loss A1.8 Shielded Measurements to Establish Field Transmis-sion Loss or a Minimum Value of it A1.9 A1.10
11	A2. MEASUREMENT OF NOISE REDUCTION BETWEEN LARGE SPACES A2.1 Scope A2.2 Significance A2.3 Measurement Space A2.4 Source Side Sound Field Uniformity A2.5 Source and Receiving Room A2.6 Background Noise Levels A2.7 Calculations
12	REFERENCES

Additional information

Standard Title	E336-08 Standard Test Method for Measurement of Airborne Sound Attenuation between Rooms in Buildings
Published Code	ASTM
Publication Date	2008
Pages Count	12
ICS Codes	91.120.20 - Acoustics in building. Sound insulation

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ASTM-E336 2008

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