ASTM C1570-03

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Designation:C1570–03
Standard Test Method for
Wind Resistance of Concrete and Clay Roof Tiles
(Air Permeability Method)
This standard is issued under the fixed designation C 1570; 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 (e) indicates an editorial change since the last revision or reapproval.
1. Scope 3. Terminology
1.1 The air permeability of tile roofing systems is a critical 3.1 Definitions—For definitions of terms used in this test
factor in determining the wind resistance of tile roofing as method refer to Terminology C 43, and Specifications C 1167
applied to a roof. This Standard describes a procedure for and C 1492.
measuring the air permeability of clay and concrete tile and
4. Principle of the Test Method
slate roof systems when applied to a small section of roof deck
4.1 Air pressure is applied to the underside of an air
in accordance with the manufacturer’s instructions.
1.2 This test procedure measures the air permeability of a permeable assembly of a specified type of roofing elements.
The difference in air pressure across the assembly and the
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 volumeairflowratearemeasuredandusedtodeterminetheair
permeability of the assembly.
2-in. (51-mm).
1.3 This standard does not purport to address all of the
5. Significance and Use
safety concerns, if any, associated with its use. It is the
5.1 The air permeability of roofing systems constructed
responsibility of the user of this standard to establish appro-
from discrete elements, as is the case for clay and concrete tile
priate safety and health practices and determine the applica-
and slate roof systems, is a critical factor in determining the
bility of regulatory limitations prior to use.
wind resistance of the roof system. The ability of the roof
2. Referenced Documents
system to relieve wind-induced uplift pressures as a result of
2.1 ASTM Standards: the overall air permeability of the roof assembly relates to the
C 43 Terminology of Structural Clay Products resistance of the roof system to damage induced by wind.
5.2 Natural wind conditions differ with respect to intensity,
C 67 Test Methods for Sampling and Testing Brick and
Structural Clay Tile duration, and turbulence; these conditions are beyond the
means of this test method to simulate.
C 140 Test Methods of Sampling and Testing Concrete
Masonry Units
2 6. Apparatus
C 1167 Specification for Clay Roof Tiles
6.1 A plenum chamber is a rectangular box with a depth of
C 1492 Specification for Concrete Roof Tiles
not less than 1.64 ft (500 mm) or one-third of the least lateral
2.2 SBCCI Standard:
dimension, whichever is the greater.The plenum chamber shall
SBCCI SSDT 11, SBCCI Test Standard for Determining
be made airtight except for an open upper face to receive a
Wind Resistance of Concrete or Clay Roof Tiles
mounting board or cover panel, a tapping for a pressure
NOTE 1—This standard is based on the International Code Council’s
difference gage (relative to atmospheric pressure) and a con-
ICC/SBCCI SSTD 11 and work derived from the tile industry’s testing
nection to an air delivery pipe. The tapping shall be positioned
programs completed in the Redland Wind Tunnel in the UK.
to avoid direct alignment with the air delivery pipe. The shape
2.3 ASCE Standard:
and area of the mounting surface shall be capable of accepting
ASCE 7, Minimum Design Loads for Buildings and Other
the number of test samples specified in 8.1 as a minimum. A
Structures
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.
This test method is under the jurisdiction of ASTM Committee C15 on
Manufactured Masonry Units and is the direct responsibility of Subcommittee
6.3 An open face mounting board to receive the roofing
C15.06 on Roofing Tile .
substrate and test samples.
Current edition approved August 10, 2003. Published August 2003.
Annual Book of ASTM Standards, Vol 04.05.
Available from The American Society of Civil Engineers (ASCE), 1801
Alexander Bell Dr., Reston, VA 20191.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
C1570–03
FIG. 1 Air Permeability Test Apparatus
6.4 A controllable air flow generator shall be capable of 9.2 Calculate the average weight (w), lbm (kg), of a roofing
t
continuously delivering air at a rate such that the uplift element.
overturning moment on the roofing elements induced by the
9.3 Calculate the upward pressure difference, Dp , which is
c
pressure in the plenum chamber by the air flow is equal and
the critical pressure drop which will just fail to lift an array of
opposite to the dead weight restoring moment.
unfixed samples from:
6.5 An airflow meter capable of measuring air volume flow
Dp 5 0.9 $wL / ~bg L !% (1)
3 c t g a u
rates in the delivery pipe and having an accuracy of 0.1 ft /s
(0.003 m /s) or better.
where:
6.6 A pressure difference measuring device (such as a
L = distance, ft (m), from the center of gravity of the
g
manometer) connected to the inside and outside of the plenum
sampletoitsuppermostlineofsupportorthetopedge
chamber, capable of measuring a pressure difference of not less of the batten,
than 0.15 psi (1000 Pa). b = exposed width, ft (m), of the roof tile or slate,
g = batten gage, ft (m) which is also the exposed length of
6.7 Airtight seals for pipe connections, mounting board and
a
the tile, and
cover panels, and at joints and edges of the roofing assembly.
L = distance, ft (m), from the center of the exposed area of
6.8 A weighing device capable of measuring the dead u
the sample to its uppermost line of support or the top
weight of the roofing elements to the nearest 0.1 lbm (0.05 kg).
edge of the batten.
7. Check on Air-tightness of the Apparatus
7.1 Close the top of the plenum chamber by attaching and
10. Preparation of the Test Assembly
sealing th
...