CEN/TR 15601:2012

SLOVENSKI STANDARD
01-junij-2012
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Hygrothermal performance of buildings - Resistance to wind-driven rain of roof coverings
with discontinuously laid small elements - Test method
Wärme- und feuchteschutztechnisches Verhalten von Gebäuden - Widerstand von
Dacheindeckungen aus kleinformatigen, überlappend gedeckten Dachelementen gegen
Schlagregen - Prüfverfahren
Performance hygrothermique des bâtiments - Résistance a la pluie battante de
couvertures en petits éléments posés en discontinu - Méthode d’essai
Ta slovenski standard je istoveten z: CEN/TR 15601:2012
ICS:
91.060.20 Strehe Roofs
91.120.10 Toplotna izolacija stavb Thermal insulation
91.120.30 =DãþLWDSUHGYODJR Waterproofing
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

TECHNICAL REPORT
CEN/TR 15601
RAPPORT TECHNIQUE
TECHNISCHER BERICHT
March 2012
ICS 91.120.10; 91.120.30
English Version
Hygrothermal performance of buildings - Resistance to wind -
driven rain of roof coverings with discontinuously laid small
elements - Test methods
Performance hygrothermique des bâtiments - Résistance à Wärme- und feuchteschutztechnisches Verhalten von
la pluie battante de couvertures en petits éléments posés Gebäuden - Widerstand von Dacheindeckungen aus
en discontinu - Méthodes d'essai kleinformatigen, überlappend gedeckten Dachelementen
gegen Schlagregen - Prüfverfahren

This Technical Report was approved by CEN on 7 February 2012. It has been drawn up by the Technical Committee CEN/TC 89.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland,
Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom.

EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2012 CEN All rights of exploitation in any form and by any means reserved Ref. No. CEN/TR 15601:2012: E
worldwide for CEN national Members.

Contents Page
Foreword .3
Introduction .4
1 Scope .5
2 Normative References .5
3 Terms and definitions .5
4 Symbols and units .6
5 Principle .6
6 Test specimens .6
6.1 Test specimen samples .6
6.2 Dimensions of the test specimen .6
6.3 Number of sets of tests .7
6.4 Preparation of test specimen .7
7 Apparatus .7
7.1 General .7
7.2 Suction chamber .7
7.3 Fan system .8
7.4 Rain generating installation .8
7.5 Run-off water .9
7.6 Observation and measurement of leakage .9
8 Test procedure .9
8.1 General .9
8.2 Test conditions . 10
8.2.1 General . 10
8.2.2 Wind speed modification for roof pitch . 10
8.2.3 Run-off water . 11
9 Evaluation and expression of test results . 15
10 Test report . 15
Annex A (Informative) Examples of wind-driven rain apparatus . 17
Annex B (Informative) Derivation of the rainfall rate on a pitched roof . 22
Annex C (Normative) Use of test results . 23
Bibliography . 24
Foreword
This document (CEN/TR 15601:2012) has been prepared by Technical Committee CEN/TC 89 “Thermal
performance of buildings and building components”, the secretariat of which is held by SIS.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights.
Introduction
The extent to which roof coverings can resist water penetration from the combination of wind and rain,
commonly referred to as wind driven rain, is important for the design of roofs. This CEN Technical Report
describes a method of test to determine the performance of the roof covering against wind driven rain.
The combined action of wind and rain varies considerably with geographical location of a building and the
associated differences in the rain and wind climate. Wind-rain climate zones are specified for: Northern
Europe Coastal, Central Europe and Southern Europe. Each climate zone is divided into four wind-rain sub-
tests (including a deluge condition).
This Technical Report does not contain information on the level of acceptable performance. The use of test
results is given in Annex C.
In case of reference should be made to testing according to this document the word "shall" is used at the
appropriate places.
1 Scope
This Techncial Report describes a method of test for determining the resistance of pitched roof coverings to
wind-driven and deluge rain.
The test method is applicable to discontinuously laid unsealed small roof covering elements such as clay tiles,
concrete tiles, slates, fibre cement slates and stones.
NOTE The test method may be adapted for fittings.
2 Normative References
This document contains no normative references.
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
test specimen
assembled array of elements for testing over which water leakage is to be observed or measured, excluding
perimeter elements with sealed joints
3.2
set of tests
consisting of sub-tests B and D, (and optionally subtests A and C), for an appropriate climate zone, roof pitch
and laying specification
Note 1 to entry: The sub-tests A, B, C and D are defined in Clause 8.
3.3
reference leakage rate
leakage rate of 10 g/m /5 min, 5-minutes being the duration of a single test step in the sub-test
4 Symbols and units
Symbol Quantity Unit
f
wind speed factor relating u and u -
s
I
u turbulence intensity %
L Simulated additional rafter length above the test specimen m
R rainfall rate on a horizontal plane mm/h
h
R
run-off rate l/min
ro
R rainfall rate on the roof surface mm/h
t
u
wind speed approaching the roof m/s
u
terminal velocity of rain drops m/s
t
σ Standard deviation of the turbulent fluctuations in the wind speed m/s
g
ū Mean wind speed approaching the roof m/s
u wind speed over test specimen m/s
s
W
the effective width of the test specimen m
α
roof pitch Degree°
o
θ angle of incidence of rain Degree

5 Principle
A test specimen is fitted into the wind-driven rain apparatus, the external surface of the test specimen is
exposed to wind and continuously sprayed with water, and run-off water is continuously applied at the top of
the specimen. At the same time an air pressure difference between the upper and lower surfaces of the test
specimen is increased or decreased in specific steps.
Water leakage through the test specimen, which can occur at certain air pressure differences, is observed and
measured.
6 Test specimens
6.1 Test specimen samples
Samples for the test specimen shall comply, where relevant, with the appropriate product standard in respect
of the appropriate sampling plan, or, in absence of a standard sampling plan, shall be selected at random from
a representative population.
Discontinuously laid small elements for the test specimen shall be surface dry.
6.2 Dimensions of the test specimen
The dimensions of the test specimen shall be as large as necessary to be representative of the intended use.
The joints of elements in the test specimen shall be representative, e.g. the same length per square meter as
designed for its intended use.
The test specimen shall comprise a minimum of 9 roof covering elements, a minimum length of 1,0 m and a
minimum width of 1,0 m on a rectangular format.
6.3 Number of sets of tests
The number of sets of tests shall be at least one.
6.4 Preparation of test specimen
Construct the test specimen according to the roofing specification representative of its intended use (such as
roof pitch, lap and the influence of fixing systems where appropriate).
The test specimen may be built in a surrounding frame to facilitate transport and fitting to the opening of the
driving rain test apparatus. The joint between test specimen and surrounding frame shall be sealed to prevent
water leakage during the test, without disturbance to joints between the discontinuously laid elements.
If a frame is used, it shall be able to resist the pressures applied during the test without deflecting to an extent
that would influence the test results. The surround shall be prepared and installed so that any water
penetration through the unsealed area of the test specimen is readily detectable.
The test specimen shall be conditioned to be surface dry before each test.
7 Apparatus
7.1 General
The test apparatus shall consist of:
 a suction chamber sealed to the underside of the test specimen and connected to a suction fan, as
specified in 7.2;
 a fan system to create wind on the outside of the test specimen, as specified in 7.3;
 an installation capable of generating rain on the outside of the test specimen, as specified in 7.4;
 provisions for creating run-off water on the outside of the test specimen, as specified in 7.5; and
 facility for observation and measurement of leakage as specified in 7.6.
Examples of wind-driven rain apparatus are illustrated in Annex A.
NOTE Apparatus of different design is likely to produce different wind driven rain test results, but can produce
consistent comparisons of performance between different roof covering elements.
7.2 Suction chamber
The suction fan connected to the suction chamber shall be capable of creating a stable pressure difference,
maintained for 5 minutes ± 10 seconds, across the test specimen. The pressure difference shall be measured
to a maximum inaccuracy of 1 % or 2,5 Pa, whichever is greater. The height and shape of the suction
chamber shall be sufficient to ensure uniform pressure conditions.
It shall be possible, when required, to seal the connection between the suction chamber and the suction fan
(e.g. by providing a valve, which can be closed or opened).
A wa
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