CEN/TS 15083-2:2005

SLOVENSKI STANDARD
01-december-2006
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Durability of wood and wood-based products - Determination of the natural durability of
solid wood against wood-destroying fungi, test methods - Part 2: Soft rotting micro-fungi
Dauerhaftigkeit von Holz und Holzprodukten - Bestimmung der natürlichen
Dauerhaftigkeit von Vollholz gegen holzzerstörende Pilze, Prüfverfahren - Teil 2:
Moderfäulepilze
Durabilité du bois et des matériaux dérivés - Détermination de la durabilité naturelle du
bois massif vis-a-vis des champignons lignivores, méthodes d'essai - Partie 2: Micro-
organismes de pourriture molle
Ta slovenski standard je istoveten z: CEN/TS 15083-2:2005
ICS:
79.040 Les, hlodovina in žagan les Wood, sawlogs and sawn
timber
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

TECHNICAL SPECIFICATION
CEN/TS 15083-2
SPÉCIFICATION TECHNIQUE
TECHNISCHE SPEZIFIKATION
July 2005
ICS 79.040
English Version
Durability of wood and wood-based products - Determination of
the natural durability of solid wood against wood-destroying
fungi, test methods - Part 2: Soft rotting micro-fungi
Durabilité du bois et des matériaux dérivés - Détermination Dauerhaftigkeit von Holz und Holzprodukten - Bestimmung
de la durabilité naturelle du bois massif vis-à-vis des der natürlichen Dauerhaftigkeit von Vollholz gegen
champignons lignivores, méthodes d'essai - Partie 2: holzzerstörende Pilze, Prüfverfahren - Teil 2:
Micro-organismes de pourriture molle Moderfäulepilze
This Technical Specification (CEN/TS) was approved by CEN on 1 March 2005 for provisional application.
The period of validity of this CEN/TS is limited initially to three years. After two years the members of CEN will be requested to submit their
comments, particularly on the question whether the CEN/TS can be converted into a European Standard.
CEN members are required to announce the existence of this CEN/TS in the same way as for an EN and to make the CEN/TS available
promptly at national level in an appropriate form. It is permissible to keep conflicting national standards in force (in parallel to the CEN/TS)
until the final decision about the possible conversion of the CEN/TS into an EN is reached.
CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France,
Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia,
Slovenia, Spain, Sweden, Switzerland and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: rue de Stassart, 36  B-1050 Brussels
© 2005 CEN All rights of exploitation in any form and by any means reserved Ref. No. CEN/TS 15083-2:2005: 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 Principle.5
5 Test materials and apparatus.5
6 Test specimens .7
7 Procedure .8
8 Calculation of x-value .11
9 Test report .12
Annex A (informative) Guidance on sampling.14
Annex B (informative) Determination of water holding capacity .15

Annex C (informative) Rapid soil virulence test.17
Annex D (informative) Diagnostic microscopy of exposed samples.18
Annex E (informative) Assessment of results.21
Annex F (informative) Example of a test report for a softwood timber .22
Bibliography.25

Foreword
This document (CEN/TS 15083-2:2005) has been prepared by Technical Committee CEN/TC 38 “Durability of
wood and wood-based products”, the secretariat of which is held by AFNOR.
This document consists of two parts, Part 1 determines the natural durability of solid wood against wood
destroying basidiomycetes fungi and Part 2 against soft rotting micro-fungi.
According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following
countries are bound to announce this CEN Technical Specification: Austria, Belgium, Cyprus, Czech Republic,
Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,
Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland
and the United Kingdom.
Introduction
This CEN Technical Specification describes a laboratory method of test which gives a basis for the
assessment of the natural durability of a sample of timber against micro-fungi (ascomycetes and fungi
imperfecti) which cause soft rot of wood in service. The infection source is the natural micro-flora of the soil
substrate which can also contain other micro-organisms, such as bacteria, and other fungi such as moulds
and basidiomycetes. These other organisms can influence the development of soft rot attack in the test
specimens. The natural durability of a species of timber can vary depending on the conditions of growth such
as climate and soil type. For this reason, the durability established using the method described in this CEN
Technical Specification will relate only to the sample of timber tested. Guidance on sampling is given in Annex
A.
This laboratory method provides one criterion by which the durability of the timber can be assessed. It is
recommended that this information be supplemented by data from other relevant tests, for example CEN/TS
15083-1, and above all by practical experience.
The procedures described in this CEN Technical Specification are intended to be carried out by suitably
trained and/or supervised specialists.
1 Scope
This CEN Technical Specification specifies a method of test for determining the natural durability of a timber
against soft rotting micro-fungi. The method is applicable to all timber species.
NOTE This method may be used in conjunction with an ageing procedure, for example EN 73 or EN 84.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated
references, only the edition cited applies. For undated references, the latest edition of the referenced
document (including any amendments) applies.
EN 84, Wood preservatives − Accelerated ageing tests of treated wood prior to biological testing − Leaching
procedure
EN ISO 3696, Water for analytical laboratory use − Specification and test methods (ISO 3696:1987)
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
supplier
sponsor of the test (person or company providing the sample of timber to be tested)
4 Principle
Test specimens prepared from the timber under test and reference timber test specimens are exposed to
attack by soft rotting micro-fungi. After a prescribed period of incubation under defined conditions, the
percentage loss in dry mass of the test specimens is used to estimate the resistance of hardwood test timbers
to attack by the test fungi and as the basis of a provisional durability rating. For softwood test timbers, the
percentage loss in dry mass is recorded but the provisional durability rating is based on the loss of modulus of
elasticity.
5 Test materials and apparatus
5.1 Biological material
5.1.1 Soil
1)
Natural top soil or a fertile loam-based horticultural soil of pH 6 to pH 8 and not containing added
agrochemical. It shall have a water holding capacity (WHC) of between 25 % and 60 %.
NOTE 1 A suitable method for determining WHC is described in Annex B.

1)
A horticultural soil of the John Innes No. 2 type and with the following composition has been found to be suitable;
seven parts by volume loam, three parts by volume sphagnum peat, two parts by volume sharp sand plus 0,6 g chalk and
6,0 g slow release fertilizer per litre of soil mixture. If the WHC is too high, it can be lowered by modifying the soil with the
addition of sand.
If a natural soil is used, it shall have the turf or top 50 mm removed and shall not be taken from a depth below
200 mm from the original surface. It shall be passed through a sieve of nominal aperture size 12,5 mm. If it is
necessary to store the soil prior to use, it shall be stored in closed moisture proof containers. Before use,
thoroughly mix the sample of soil.
NOTE 2 The soil should only be collected in a moist condition.
If a horticultural soil is used which is sterilised during its preparation, then 20 % of a natural soil, prepared as
above, shall be added and the soils thoroughly mixed prior to the start of the test.
The soil shall be used only once.
NOTE 3 If assurance of the virulence of the soil is required, the test procedure using cotton cloth described in Annex C,
or a similar standardised procedure, may be used.
5.1.2 Reference timbers
5.1.2.1 Species
The following species of wood shall be used for the tests:
 Scots pine sapwood (Pinus sylvestris Linnaeus) for tests with softwoods.
 beech (Fagus sylvatica Linnaeus) for tests with hardwoods and softwoods.
5.1.2.2 Wood quality
The wood shall be free from cracks, stain, decay, insect damage or other defects. The wood shall not have
been water-stored, floated, chemically treated or steamed.
NOTE Wood that has been kiln dried at temperatures below 60 °C may be used.
The Scots pine shall be exclusively sapwood containing little resin and having between 2,5 and 8 annual
growth rings per 10 mm. The proportion of latewood in the annual rings shall not exceed 30 % of the whole.
The beech shall be even-grained, free from tyloses and discoloration. It shall have between 2 and 6 annual
growth rings per 10 mm.
5.1.2.3 Provision of reference timber test specimens
Condition the wood to a mass fraction of (12 ± 2) % moisture content. Prepare planed strips having a cross-
section of (10 ± 0,1) mm × (5 ± 0,1) mm. The longitudinal faces shall be parallel to the direction of the grain.
The annual rings shall have a contact angle of (90 ± 15)° to the broad faces. Make transverse cuts, neatly to
give sharp edges and a fine-sawn finish to the end-grain surfaces, to give reference timber test specimens
(100 ± 1) mm long.
The test specimens shall originate from a minimum of three trees or shall be taken from a stock originally of
more than 500 test specimens.
NOTE 1 A moisture meter of the two-pronged electrical conductivity type is suitable for assessing moisture content.
NOTE 2 A moisture content of mass fraction (12 ± 2) % can be achieved in the conditions provided by the conditioning
chamber (5.2.1).
5.1.2.4 Dimensions and density of reference timber test specimens
The dimensions of each reference timber test specimen at a mass fraction of (12 ± 2) % moisture content
shall be (100 ± 1) mm × (10 ± 0,1) mm × (5 ± 0,1) mm.
In a batch of test specimens, the density of an individual is permitted to differ from the mean value of the batch
by ± 10 %.
5.1.2.5 Number and distribution of reference timber test specimens
For softwoods use at least 30 reference timber test specimens but a minimum of three per test container.
NOTE Both Scots pine sapwood and beech reference timber test specimens should be used in tests with softwoods.
For hardwoods, the test specimens represent three sets of 10 replicates which can be assessed after different
exposure periods (see 7.5.1).
Mark each test specimen so that it can be identified throughout the test.
5.2 Material
Water, complying with grade 3 of EN ISO 3696.
5.3 Apparatus
5.3.1 Conditioning chamber, well ventilated and controlled at (20 ± 2) °C and (65 ± 5) % relative humidity.
5.3.2 Drying oven, capable of being controlled at (103 ± 2) °C.
5.3.3 Desiccators, with efficient desiccant (silica gel for example).
5.3.4 Test containers, made of material which does not have a toxic effect on the soil inhabiting micro-
organisms and provided with a ventilated lid. The depth shall be at least 150 mm, so as to provide at least
30 mm below the test specimens when inserted in the soil to a depth of 80 mm and adequate clearance above
the top of the protruding parts of the test specimens.
5.3.5 Culture chamber
...