ASTM C1570-22

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Designation: C1570 − 03 (Reapproved 2016) C1570 − 22
Standard Test Method for
Wind Resistance of Concrete and Clay Roof Tiles (Air
Permeability Method)
This standard is issued under the fixed designation C1570; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope
1.1 The air permeability of tile roofing systems is a critical factor in determining the wind resistance of tile roofing as applied to
a roof. This Standard describes a procedure for measuring the air permeability of clay and concrete tile and slate roof systems when
applied to a small section of roof deck in accordance with the manufacturer’s instructions.
1.2 This test procedure measures the air permeability of a laid array of unsealed clay or concrete roof tiles or slates. The tiles or
slates shall have a thickness between ⁄8-in. (3-mm) and 2-in. (51-mm).
1.3 The text of this test method references notes and footnotes, which provide explanatory material. These notes and footnotes
(excluding those in tables and figures) shall not be considered as requirements of the standard.
1.4 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical
conversions to SI units that are provided for information only and are not considered standard.
1.5 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 safety, health, and healthenvironmental practices and determine the
applicability of regulatory limitations prior to use.
1.6 This international standard was developed in accordance with internationally recognized principles on standardization
established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued
by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
2. Referenced Documents
2.1 ASTM Standards:
C43 Terminology of Structural Clay Products (Withdrawn 2009)
C1167 Specification for Clay Roof Tiles
C1232 Terminology for Masonry
C1492 Specification for Concrete Roof Tile
2.2 SBCCI Standard:
SBCCI SSDT 11, SBCCI Test Standard for Determining Wind Resistance of Concrete or Clay Roof Tiles
This test method is under the jurisdiction of ASTM Committee C15 on Manufactured Masonry Units and is the direct responsibility of Subcommittee C15.06 on Roofing
Tile.
Current edition approved Dec. 1, 2016March 1, 2022. Published December 2016April 2022. Originally approved in 2003. Last previous edition approved in 20092016
as C1570 – 03(2009).(2016). DOI: 10.1520/C1570-03R16.10.1520/C1570-22.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
C1570 − 22
NOTE 1—This standard is based on the International Code Council’s ICC/SBCCI SSTD 11 and work derived from the tile industry’s testing programs
completed in the Redland Wind Tunnel in the UK.
2.3 ASCE Standard:
ASCE 7, Minimum Design Loads for Buildings and Other Structures
3. Terminology
3.1 Definitions—For definitions of terms used in this test method refer to Terminology C43C1232, and Specifications C1167 and
C1492.
4. Principle of the Test Method
4.1 Air pressure is applied to the underside of an air permeable assembly of a specified type of roofing elements. The difference
in air pressure across the assembly and the volume air flow rate are measured and used to determine the air permeability of the
assembly.
5. Significance and Use
5.1 The air permeability of roofing systems constructed from discrete elements, as is the case for clay and concrete tile and slate
roof systems, is a critical factor in determining the wind resistance of the roof system. The ability of the roof system to relieve
wind-induced uplift pressures as a result of the overall air permeability of the roof assembly relates to the resistance of the roof
system to damage induced by wind.
5.2 Natural wind conditions differ with respect to intensity, duration, and turbulence; these conditions are beyond the means of
this test method to simulate.
6. Apparatus
6.1 A plenum chamber is a rectangular box with a depth of not less than 1.64 ft (500 mm) or one-third of the least lateral
dimension, whichever is the greater. The plenum chamber shall be made airtight except for an open upper face to receive a
mounting board or cover panel, a tapping for a pressure difference gage (relative to atmospheric pressure) and a connection to an
air delivery pipe. The tapping shall be positioned to avoid direct alignment with the air delivery pipe. The shape and area of the
mounting surface shall be capable of accepting the number of test samples specified in 8.1 as a minimum. A schematic of the air
permeability apparatus is shown in Fig. 1.
6.2 An airtight removable cover panel shall be secured airtight to the plenum chamber.
6.3 An open face mounting board to receive the roofing substrate and test samples.
6.4 A controllable air flow generator shall be capable of continuously delivering air at a rate such that the uplift overturning
moment on the roofing elements induced by the pressure in the plenum chamber by the air flow is equal and opposite to the dead
weight restoring moment.
FIG. 1 Air Permeability Test Apparatus
Available from American Society of Civil Engineers (ASCE), 1801 Alexander Bell Dr., Reston, VA 20191, http://www.asce.org.
C1570 − 22
6.5 An airflow meter capable of measuring air volume flow rates in the delivery pipe and having an accuracy of 0.1 ft /s (0.003
m /s) or better.
6.6 A pressure difference measuring device (such as a manometer) connected to the inside and outside of the plenum chamber,
capable of measuring a pressure difference of not less than 0.15 psi (1000 Pa).
6.7 Airtight seals for pipe connections, mounting board and cover panels, and at joints and edges of the roofing assembly.
6.8 A weighing device capable of measuring the dead weight of the roofing elements to the nearest 0.1 lbm (0.05 kg).
7. Check on Air-tightness of the Apparatus
7.1 Close the top of the plenum chamber by attaching and sealing the edges of the mounting board or cover panel so that the
plenum chamber is air-tight except where connected to the delivery pipe.
7.2 Supply air from the airflow ge
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