ASTM C1570-03(2009)
(Test Method)Standard Test Method for Wind Resistance of Concrete and Clay Roof Tiles(Air Permeability Method)
Standard Test Method for Wind Resistance of Concrete and Clay Roof Tiles(Air Permeability Method)
SIGNIFICANCE AND USE
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.
Natural wind conditions differ with respect to intensity, duration, and turbulence; these conditions are beyond the means of this test method to simulate.
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 1/8-in. (3-mm) and 2-in. (51-mm).
1.3 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.
1.4 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.
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Designation: C1570 − 03 (Reapproved 2009)
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.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
NOTE 1—This standard is based on the International Code Council’s
1. Scope
ICC/SBCCI SSTD 11 and work derived from the tile industry’s testing
1.1 The air permeability of tile roofing systems is a critical
programs completed in the Redland Wind Tunnel in the UK.
factor in determining the wind resistance of tile roofing as
2.3 ASCE Standard:
applied to a roof. This Standard describes a procedure for
ASCE 7,Minimum Design Loads for Buildings and Other
measuring the air permeability of clay and concrete tile and
Structures
slate roof systems when applied to a small section of roof deck
in accordance with the manufacturer’s instructions.
3. Terminology
1.2 This test procedure measures the air permeability of a
3.1 Definitions—For definitions of terms used in this test
laid array of unsealed clay or concrete roof tiles or slates. The
method refer to Terminology C43, and Specifications C1167
tilesorslatesshallhaveathicknessbetween ⁄8-in.(3-mm)and
and C1492.
2-in. (51-mm).
4. Principle of the Test Method
1.3 The values stated in inch-pound units are to be regarded
as standard. The values given in parentheses are mathematical 4.1 Air pressure is applied to the underside of an air
conversions to SI units that are provided for information only permeable assembly of a specified type of roofing elements.
and are not considered standard. The difference in air pressure across the assembly and the
volumeairflowratearemeasuredandusedtodeterminetheair
1.4 This standard does not purport to address all of the
permeability of the assembly.
safety concerns, if any, associated with its use. It is the
responsibility of the user of this standard to establish appro-
5. Significance and Use
priate safety and health practices and determine the applica-
5.1 The air permeability of roofing systems constructed
bility of regulatory limitations prior to use.
from discrete elements, as is the case for clay and concrete tile
2. Referenced Documents and slate roof systems, is a critical factor in determining the
wind resistance of the roof system. The ability of the roof
2.1 ASTM Standards:
system to relieve wind-induced uplift pressures as a result of
C43Terminology of Structural Clay Products (Withdrawn
the overall air permeability of the roof assembly relates to the
2009)
resistance of the roof system to damage induced by wind.
C1167Specification for Clay Roof Tiles
C1492Specification for Concrete Roof Tile
5.2 Natural wind conditions differ with respect to intensity,
duration, and turbulence; these conditions are beyond the
2.2 SBCCI Standard:
means of this test method to simulate.
SBCCI SSDT 11,SBCCI Test Standard for Determining
Wind Resistance of Concrete or Clay Roof Tiles
6. Apparatus
6.1 Aplenum chamber is a rectangular box with a depth of
This test method is under the jurisdiction of ASTM Committee C15 on
not less than 1.64 ft (500 mm) or one-third of the least lateral
Manufactured Masonry Units and is the direct responsibility of Subcommittee
dimension,whicheveristhegreater.Theplenumchambershall
C15.06 on Roofing Tile.
CurrenteditionapprovedJune1,2009.PublishedJuly2009.Originallyapproved be made airtight except for an open upper face to receive a
in 2003. Last previous edition approved in 2003 as C1570–03. DOI: 10.1520/
mounting board or cover panel, a tapping for a pressure
C1570-03R09.
difference gage (relative to atmospheric pressure) and a con-
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
nection to an air delivery pipe.The tapping shall be positioned
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.
3 4
The last approved version of this historical standard is referenced on Available fromAmerican Society of Civil Engineers (ASCE), 1801Alexander
www.astm.org. Bell Dr., Reston, VA 20191, http://www.asce.org.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
C1570 − 03 (2009)
to avoid direct alignment with the air delivery pipe. The shape 8.2 Providesufficientroofelementfasteningsystems,where
and area of the mounting surface shall be capable of accepting appropriate.
the number of test samples specified in 8.1 as a minimum. A
8.3 Provide sufficient roof substrate materials, such as
schematic of the air permeability apparatus is shown in Fig. 1.
battens and their fasteners.
6.2 An airtight removable cover panel shall be secured
airtight to the plenum chamber. 9. Determination of the Critical Uplift Pressure
Difference,∆p , lbf/ft (Pa)
c
6.3 An open face mounting board to receive the roofing
substrate and test samples. 9.1 Weigh each of the roofing elements in the air-dry
condition.
6.4 A controllable air flow generator shall be capable of
continuously delivering air at a rate such that the uplift 9.2 Calculatetheaverageweight( w),lbm(kg),ofaroofing
t
overturning moment on the roofing elements induced by the element.
pressure in the plenum chamber by the air flow is equal and
9.3 Calculate the upward pressure difference, ∆p , which is
c
opposite to the dead weight restoring moment.
the critical pressure drop which will just fail to lift an array of
6.5 An airflow meter capable of measuring air volume flow
unfixed samples from:
rates in the delivery pipe and having an accuracy of 0.1 ft /s
∆p 5 0.9 $w L /~bg L !% (1)
c t g a u
(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
sample to its uppermost line of support or the top edge
chamber,capableofmeasuringapressuredifferenceofnotless
of the batten,
than 0.15 psi (1000 Pa).
b = exposed width, ft (m), of the roof tile or slate,
6.7 Airtight seals for pipe connections, mounting board and
g = batten gage, ft (m) which is also the exposed length of
a
cover panels, and at joints and edges of the roofi
...
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