EN 12871:2001
(Main)Wood-based panels - Performance specifications and requirements for load bearing boards for use in floors, walls and roofs
Wood-based panels - Performance specifications and requirements for load bearing boards for use in floors, walls and roofs
Migrated from Progress Sheet (TC Comment) (2000-07-10): Result of the merging of WIs 019-021, 038-040, 067 (TC Res 263/1998)(CC/981223) ++ Res. 278 : approved for FV (MB/990415)
Holzwerkstoffe - Leistungsspezifikationen und Anforderungen für tragende Platten zur Verwendung in Fußböden, Wänden und Dächern
Diese Europäische Norm legt die Leistungsspezifikationen und Anforderungen für tragende Holzwerkstoffe in
Fußböden, Dächern und Wänden fest und beschreibt ein Nachweis-Verfahren, das auf der Prototyp-Prüfung beruht.
Darüber hinaus wird auf allgemeine Leistungsanforderungen für Lasten Bezug genommen, die in ENV 1991-1,
ENV 1991-2-1 oder ENV-1995-1-1 nicht definiert sind.
Flächenlasten nach ENV 1991-2-1 werden in dieser Norm nicht berücksichtigt; sie können jedoch durch Berechnung
nach ENV 1995-1-1 nachgewiesen werden, siehe Abschnitt 6.
Diese Norm berücksichtigt auch das Konzept der Stanzscherung ("punching shear").
Diese Europäische Norm legt auch Anforderungen an zusätzliche Eigenschaften fest, die in anderen Europäischen
Normen nicht angegeben sind und für Holzwerkstoffe bei tragender Verwendung als Schalung und Beplankung in
Böden, Dächern und Wänden gelten.
Panneaux à base de bois - Spécifications et exigences fonctionnelles pour panneaux travaillants utilisés en planchers, murs et toitures
La présente Norme européenne présente les spécifications et exigences fonctionnelles pour des panneaux à base de bois travaillants, utilisés en tant que platelages et parois structurels dans les planchers, toitures et murs et fournit une méthode de justification de la conformité basée sur un essai de prototype.
Il est aussi fait référence aux exigences générales fonctionnelles pour les charges qui ne sont pas définies dans ENV 1991-1, ENV 1991-2-1 ou ENV 1995-1-1.
Les charges uniformément réparties selon ENV 1991-2-1 ne sont pas prises en compte dans cette norme mais peuvent être vérifiées par le calcul selon ENV 1995-1-1, se référer à l'article 6.
Le concept de cisaillement causé par une charge concentrée est inclus dans cette norme
Cette Norme européenne prescrit également des exigences pour des propriétés additionnelles des panneaux à base de bois travaillants, utilisés en tant que platelages et parois structurels dans les planchers, toitures et murs qui ne sont pas données dans d'autres normes européennes.
Lesne plošče - Lastnosti in zahteve za nosilne plošče, ki se uporabljajo za pode, stene in strehe
General Information
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Standards Content (Sample)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Holzwerkstoffe - Leistungsspezifikationen und Anforderungen für tragende Platten zur Verwendung in Fußböden, Wänden und DächernPanneaux a base de bois - Spécifications et exigences fonctionnelles pour panneaux travaillants utilisés en planchers, murs et toituresWood-based panels - Performance specifications and requirements for load bearing boards for use in floors, walls and roofs79.060.01Wood-based panels in generalICS:Ta slovenski standard je istoveten z:EN 12871:2001SIST EN 12871:2004en01-januar-2004SIST EN 12871:2004SLOVENSKI
STANDARD
SIST EN 12871:2004
EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 12871May 2001ICS 79.060.01English versionWood-based panels - Performance specifications andrequirements for load bearing boards for use in floors, walls androofsPanneaux à base de bois - Spécifications et exigencesfonctionnelles pour panneaux travaillants utilisés enplanchers, murs et toituresHolzwerkstoffe - Leistungsspezifikationen undAnforderungen für tragende Platten zur Verwendung inFußböden, Wänden und DächernThis European Standard was approved by CEN on 19 February 2001.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained on application to the Management Centre or to any CEN member.This European Standard exists in three official versions (English, French, German). A version in any other language made by translationunder the responsibility of a CEN member into its own language and notified to the Management Centre has the same status as the officialversions.CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece,Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMITÉ EUROPÉEN DE NORMALISATIONEUROPÄISCHES KOMITEE FÜR NORMUNGManagement Centre: rue de Stassart, 36
B-1050 Brussels© 2001 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 12871:2001 ESIST EN 12871:2004
Page 2EN 12871:2001ContentsPageForeword .2
1Scope .3
2Normative references .3
3Terms and definitions .3
4Symbols and subscripts .5
5Specifications .5
6Performance requirements .10
7Sampling and evaluation .19
8Marking .19
9Documentation .2010Report .20Annex A (normative)
Normative references .21Annex B (informative)
Guidance of installation .24Annex C (normative)
Wood-based panels — Structural roof decking onjoists — Performance test method .25Bibliography .26ForewordThis European Standard has been prepared by Technical Committee CEN/TC 112 "Wood-based panels", thesecretariat of which is held by DIN.This European Standard shall be given the status of a national standard, either by publication of an identical text orby endorsement, at the latest by November 2001, and conflicting national standards shall be withdrawn at the latestby November 2001.This European Standard combines the drafts published as prEN 12869-1:1997, prEN 12869-2:1997,prEN 12870-1:1997, prEN 12870-2:1997, prEN 12871-1:1997, prEN 12872-2:1997 and prEN 12871-3:1997.In the structural use of wood-based panels there are two methods of achieving satisfactory performance of thecompleted structure.The first approach is to design the structure by calculation using structural characteristic values (contained inEN 12369 or derived accoridng to EN 1058 and EN 789), where there are no requirements for impact and concen-trated loads, or where compliance with these requirements can be demonstrated. Subject to the above limitations,the method can be applied to any structure, but because of the method of generation of the various assumptionsused in design calculation, the derived design may not be optimized in terms of performance.The second approach is to design the structure by prototype testing in order to satisfy the requirements for bothimpact and concentrated loading. This test work is complemented by calculation in order to satisfy the requirementfor uniformly distributed load. This approach yields a more optimised design, the results from the testing apply onlyto that one specific design.This standard relates specifically to the second approach, namely, design by prototype testing. Thus, this standardsets out the specifications and requirements for load bearing wood-based panels used as structural floor or roofdecking or wall sheathing.No existing European Standard is superseded.The annexes A and C are normative. Annex B is informative. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the followingcountries are bound to implement this European Standard: Austria, Belgium, Czech Republic, Denmark, Finland,France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden,Switzerland and the United Kingdom.SIST EN 12871:2004
Page 3EN 12871:20011 ScopeThis European Standard sets out the performance specifications and requirements for load bearing wood-basedpanels used as structural decking and sheathing in floors, roofs and walls, and provides a method of demonstratingcompliance based on prototype testing.Reference is also made to general performance requirements for loads not defined in ENV 1991-1, ENV 1991-2-1or ENV 1995-1-1.Uniformly distributed loads in accordance with ENV 1991-2-1 are not included in this standard; but can be verifiedby calculation according to ENV 1995-1-1, see clause 6.The concept of punching shear is included within this standard.This European Standard also specifies requirements for additional properties for load bearing wood-based panelsused as structural decking and sheathing in floors, roofs and walls, which are not given in other EuropeanStandards.2 Normative referencesSee annex A.3 Terms and definitionsFor the purposes of this standard the following terms and definitions apply:3.1service classes3.1.1service class 1is characterized by a moisture content in the materials corresponding to a temperature of 20 °C and the relativehumidity of the surrounding air only exceeding 65 % for a few weeks per year [ENV 1995-1-1]3.1.2service class 2is characterized by a moisture content in the materials corresponding to a temperature of 20 °C and the relativehumidity of the surrounding air only exceeding 85 % for a few weeks per year [ENV 1995-1-1]3.1.3service class 3climatic conditions leading to higher moisture contents than in service class 2 [ENV 1995-1-1]3.2serviceability limit statesee ENV 1995-1-1 and ENV 1991-13.3ultimate limit statesee ENV 1995-1-1 and ENV 1991-13.4characteristic valuesee ENV 1995-1-1 and ENV 1991-1SIST EN 12871:2004
Page 4EN 12871:20013.5hazard classessee EN 335-13.6load categorysee ENV 1991-2-13.7structural floor deckingan assembly of wood-based panels supported on joists over which the decking spans. The characteristic of thedecking is that it is supported by joists and, when subjected to load, is free to deflect between the joists3.8structural wall sheathingwood-based panel capable of providing mechanical resistance to a wall structure3.9structural roof deckingan assembly of wood-based panels supported on joists over which the roof decking spans. The characteristic of thedecking is that it is supported by joists and, when subjected to load, is free to deflect between the joists3.10warm roofroof design in which the panels supported on joists are placed below the insulation. The panels are considered tobe under conditions corresponding to service class 13.11cold roofroof design in which the panels and some of the supporting joists are placed above the insulation. The panels areconsidered to be under conditions corresponding to service class 23.12setresidual deformation of the test floor, wall or roof after the removal of the applied load3.13sub-floorstructural panel meant to be covered by overlays3.14racking resistancecapacity of a component to resist an in-plane load3.15racking stiffnesssecant stiffness of a component when it is in-plane loaded to approximately 40 % of its maximum racking resistanceSIST EN 12871:2004
Page 5EN 12871:20013.16punching shearthe performance of a panel under a concentrated load excluding the effect of bending4 Symbols and subscripts4.1 SymbolsFdirect action, force (load) applied to structure, in kilonewtonskfaktorLcentre to centre distance (span) of the joists or studs, in millimetresQvariable action, concentrated load (imposed load), in kilonewtonsRstiffness of the structural decking or sheathing, in kilonewtons per millimetreudeflection, in millimetresgpartial safety factor4.2 SubscriptsQactionskcharacteristicmmaterial propertydefdeformationdisdistribution (concentrated load contact area)maxmaximummodmodificationserserviceability055-percentile1, 2, 3service class 1, 2 or 3 in accordance with ENV 1995-1-1aroof slope (angle)ppanel5 Specifications5.1 GeneralThe specification and parameters included in tables 1 and 2 shall be used for load bearing wood-based panels forstructural decking and sheathing in floors, roofs and walls.SIST EN 12871:2004
Page 6EN 12871:2001Table 1 — Panel product specification for structural decking and sheathingin floors, roofs and wallsCharacteristicsRelevant ENParticleboard–service class and gradeEN 312-4/5/6/7OSB–service class and grade–main load bearing directionEN 300-OSB/2/3/4Plywood–lay-up–wood species and surface appearance class–service class–main load bearing directionEN 313-1/2EN 635-1/2/3EN 636-1/2/3Solid-wood-panelbFibreboard–service class, type and gradeEN 622-2/3/5Cement-bonded particleboarda–service classEN 634-2aCement-bonded particleboards shall only be used for structural design provided valuesof kmod and kdef have been determined in accordance with ENV 1156bTo be included when EN specifications are available.Table 2 — Parameters to be specified for structural decking and sheathing in floors, roofs and wallsDesign parameterRelevant ENExplanationSpan (joist spacing) for floorsEN 1195Determined from the performance testSpan (stud spacing) for wallsEN 594EN 596Determined from the performance testSpan (joist spacing) for roofsAnnex DDetermined from the performance testJoints–the method of supporting the paneledgesEN 324-1/2Dimensions — According to that used inthe performance test–type of panel to panel joints (e.g.tongued & grooved, square edgedwith noggins)EN 324-1Tolerances — According to that used inthe performance test–type of fasteners (e.g. nailed,screwed and spacing)—According to that used in theperformance test–type of glue if relevant—Determined from the performance testPanel dimensionsClauses 6.4.1 and6.4.2TolerancesThicknessEN 324-1According to that used in the perform-ance testConditioning before installation–moisture contentEN 322Specified by the manufacturer —Related to service class–dimensional changes of the paneldue to change in moisture contentEN 318Specified by the manufacturer —Related to service class and functionSIST EN 12871:2004
Page 7EN 12871:20015.2 DurabilityFor all load bearing wood-based panels used for structural decking and sheathing in floors, roofs and walls in serviceclasses 1, 2 or 3 the biological hazard classes and the moisture resistance or glue bond quality depending on paneltype, shall be specified in accordance with the standards listed in table 3.Table 3 — European Standards relating to the durability of load bearing wood-based panelsPanel TypeRelevant ENExplanationSpecificationsandguidanceTest methodsParticleboardEN 335-3bEN 312-4/5/6/7EN 312-5/7EN 321EN 1087-1Biological hazard classesService class 1 — Dry conditionsService class 2 — Humid conditionsService class 2 — Cyclic test (Option 1)Service class 2 — Boil test (Option 2)OSBEN 335-3bEN 300 OSB/2/3/4EN 300 OSB/3/4EN 321EN 1087-1aBiological hazard classesService class 1 — Dry conditionsService class 2 — Humid conditionsService class 2 — Cyclic test (Option 1)Service class 2 — Boil test (Option 2)PlywoodEN 335-3bENV 1099EN 636-1/2/3EN 636-2/3EN 636-3EN 314-1/2Biological hazard classesGuideline for biological durabilityService class 1 — Dry conditionsService class 2 — Humid conditionsService class 3 — Exterior conditionsTests and requirements according to serviceclassSolid-wood-panelcFibreboardEN 335-3bEN 622-2/3/5type LA/HA/HLSEN 622-2/3/5type HA/HLSEN 321EN 1087-1aBiological hazard classesService class 1 — Dry conditionsService class 2 — Humid conditionsService class 2 — Cyclic test (Option 1)Service class 2 — Boil test (Option 2)Cement-bondedParticleboardEN 335-3bEN 634-2EN 634-2EN 634-2EN 321EN 1328Biological hazard classesService class 1 — Dry conditionsService class 2 — Humid conditionsService class 3 — Exterior conditionsService class 2 — Cyclic testService class 3 — Frost testaEN 1087-1 test methods are modified for OSB and Fibreboard type MDF, see panel specification standardbThis standard describes the moisture content that can be attained by different panel products and their risk of attack fromdifferent wood-destroying organisms (fungi, insects and marine borers) when exposed to different service environments.The service environments are defined in terms of the hazard classes of biological attack (see EN 335-1). It does notdefine the expected service life of the different panel products when used in different service environments.cTo be included when EN specifications are available.SIST EN 12871:2004
Page 8EN 12871:20015.3 Mechanical properties5.3.1 GeneralTest methods are set out in table 4.Table 4 — European Standards relating to mechanical properties and test methodsCharacteristicRelevant ENExplanationUniformly distributed loadBending strength/stiffnessEN 1058EN 789EN 12369EN 1072Sampling for and determination of characteristicvaluesTechnical data sheet from the manufacturerCharacteristic values for structural usePlywood onlyTension strength/stiffnesscDepending on designEN 1058EN 789EN 12369Sampling for and determination of characteristicvaluesTechnical data sheet from the manufacturerCharacteristic values for structural useCompression strength/stiffnesscDepending on designEN 1058EN 789EN 12369Sampling for and determination of characteristicvaluesTechnical data sheet from the manufacturerCharacteristic values for structural usePanel shear strength/modulusaDepending on designEN 1058EN 789EN 12369Sampling for and determination of characteristicvaluesTechnical data sheet from the manufacturerCharacteristic values for structural usePlanar shear strengthbDepending on designEN 1058EN 789EN 12369Sampling for and determination of characteristicvaluesTechnical data sheet from the manufacturerCharacteristic values for structural useaOnly applicable if the panel transmits horizontal loads.bOnly applicable if the panel is included in a stressed skin system or similar.cOnly applicable if this property is used in design.NOTE
The characteristic values for the above properties can either be taken from EN 12369 if present or determined usingEN 789 and EN 1058.(continued)SIST EN 12871:2004
Page 9EN 12871:2001Table 4 (concluded)CharacteristicRelevant ENExplanationConcentrated loadFloor deckingEN 1195Specified by the performance test.Determination of concentrated load and relateddeflection. Load category and field of applica-tion.Wall sheathingEN 594Specified by the performance test.Determination of racking load and relateddeflection. Load category and field of applica-tion.Roof deckingAnnex CSpecified by the performance test.Determination of concentrated load and relateddeflection. Load category and field of applica-tion.RequirementsClause 6.2Clause 6.3Floor and roof deckingWall sheathingSamplingClause 7Sampling for and determination of characteristicvaluesImpact loadFloor deckingEN 1195Specified by the performance testWall sheathingEN 596Specified by the performance testRoof deckingAnnex CSpecified by the performance testRequirementsClause 6.2.4Clause 6.3.4Floor and roof deckingWall sheathingSamplingClause 7Sampling for and determination of characteristicvalues5.3.2 Load categoriesRelevant load categories are given in 6.1.3.5.3.3 Static load5.3.3.1 Uniformly distributed load–Bending strength–Bending stiffness–Tension strength–Tension stiffness–Compression strength–Compression stiffness–Panel shear strength–Panel shear modulus–Planar shear strengthSIST EN 12871:2004
Page 10EN 12871:20015.3.3.2 Concentrated load5.3.3.2.1 Structural floor or roof decking on joists–Concentrated load as serviceability/ultimate load–Deflection in relation to stiffness (serviceability)5.3.3.2.2 Structural wall sheathing on studs–Racking strength as serviceability/ultimate load–Deflection in relation to racking stiffness (serviceability)5.3.4 Impact loadThe impact load simulates a soft body impact due to the action of persons or objects.6 Performance requirements6.1 General6.1.1 StrengthStructural decking or sheathing shall be capable of carrying loads with a sufficient margin of safety against failures(ultimate limit state) and damage during use (serviceability limit state).6.1.2 StiffnessStructural decking and sheathing shall be sufficiently stiff to ensure that the specified use does not cause vibrationsor deflections that may influence its function.Structural floor decking covered with vinyl, tile etc. and structural roof decking shall be sufficiently stiff to ensure thatthe covering material is not damaged by joint rotation, joint shear, or indentation caused by concentrated loads.6.1.3 LoadsThe required uniformly distributed or concentrated loads, for structural decking or sheathing are given inENV 1991-2-1.The fulfilment of the requirements for uniformly distributed loads shall be verified by calculation according toENV 1991-1, ENV 1991-2-1 and ENV 1995-1-1 using characteristic values.For uniformly distributed loads or concentrated loads on roofs distinction is made between–Load category H: Roofs that are not accessible except for maintenance, repair and cleaning. Normal mainten-ance, repair and cleaning includes painting and minor repairs. Any other operations e.g. replacement of roofcoverings should be treated as erection loads.–Load category I: Roofs which are accessible with occupancy. This load category should be treated according toload category A, B, C, D or E for floors.NOTE 1
The concept of punching shear is taken into account in this standard by determining the performance of the panel byconcentrated load testing according to EN 1195 using different contact areas. It is therefore not necessary to carry out punchingshear tests in addition to the tests carried out in accordance with EN 1195.SIST EN 12871:2004
Page 11EN 12871:2001The dynamic test loads (impact load) and requirements are given in 6.2.4 for floor and roof decking and in 6.3.4 forwall sheathing.NOTE 2
The impact load simulates falling objects, humans falling, jumping, dancing.6.2 Structural floor or roof decking on joists6.2.1 GeneralThe requirements specified in this standard are intended to limit deformations and prevent damage to wood-basedpanels used for structural floor or roof decking on joists. The standard does not include requirements for the strengthand stiffness of supporting joists or frame members.Testing for concentrated load and impact load shall be carried out according to table 4.The standard applies only to floors and roofs in buildings which are subjected to imposed loads according to loadcategories A, B, C, D, E (areas dwellings, offices etc.) or H (roofs not accessible) and I (Roofs accessible) accordingto ENV 1991-2-1.The standard does not apply to load categories F, G (garage and vehicle traffic areas) and K (roofs accessible forspecial services, such as helicopter landings).The dynamic load requirements of this standard (impact load) apply to loads due to falling objects, falling humans,jumping and dancing humans etc. imposed during the life of the building, excluding the period of construction.6.2.2 Requirements for serviceability limit state for concentrated load6.2.2.1 GeneralThe requirement for serviceability limit state is met by satisfying the requirements of 6.2.2.2 and 6.2.2.3.6.2.2.2 Force6.2.2.2.1 General: Serviceability limit state (Fser)When prototype tested, see table 4, the serviceability limit state is reached during testing if a discontinuity, indicatingirreversible damage, occurs on the load deflection curve even if cracks or other damage are not visible.NOTE
The serviceability limit state in service is reached when visible cracks, or other significant changes are found, which impairthe normal function of the floor or roof.6.2.2.2.2 Characteristic value: Serviceability limit state (Fser, k, 05)The 5-percentile characteristic value (Fser, k, 05), is calculated from the test values according to 7.2.Fser, k, 05 shall be separately calculated for load concentrates at the joints (e.g. tongued and grooved) and at the panelcentre.6.2.2.2.3 Requirement for serviceability limit stateThe 5-percentile characteristic value (Fser, k, 05) shall fulfil the following requirement:Fser, k, 05 ³ Qk kdis(1)SIST EN 12871:2004
Page 12EN 12871:2001whereQkis the characteristic concentrated load in kilonewtons according to ENV 1991-2-1 depending on the load category.kdisis a factor taking into account the size of the contact area when prototype tested. Qk given in ENV 1991-2-1 is relatedto a contact area 50 mm × 50 mm.When tested in accordance with EN 1195 (Floor decking, contact area 25 mm in diameter) kdis = 0,65, shall be used.When tested in accordance with annex D (Roof decking, contact area 50 mm in diameter), kdis = 0,90, shall be used.NOTE
If other contact areas A are used, the following interpolation can be usedkdis = 1,7 × 10
4 × A + 0,564for 490 mm2 £ A < 2 500 mm2kdis = 1 for 2 500 mm2 £ AwhereA is the contact area of the concentrated load in squaremillimetres6.2.2.3 Deflection6.2.2.3.1 General: Serviceability limit state (u)For floors and roofs, the deflection u under the test load of a magnitude equal to Qk shall either be equal to or lessthan the limits specified in ENV 1995-1-1, or national application documents. In addition to roofs covered withbitumen felts or single ply membrane, the requirement of 6.2.2.3.4 shall be meet.6.2.2.3.2 Mean stiffness value Rmean for serviceability limit stateThe mean stiffness value Rmean is calculated from the individual R values from the prototype testing. See table 4.For prototype testing of floor and roof decking, R shall be separately calculated for load points at the joints (e.g.tongued and grooved) and the panel centre.6.2.2.3.3 Requirement for serviceability limit stateThe mean stiffness value Rmean shall fulfill the following requirement:Rmean ³ (Qk/u) (1 + kdef, x) / (1 + kdef, y)(2)whereQkis the characteristic load, in kilonewtons, depending on load categories as specified in ENV 1991-2-1 at therequirement deflection u, in millimetres;uis the mean requirement deflection, in millimetres;Rmeanis the mean stiffness of the structural floor or roof decking in kilonewtons per millimetre found by testing at aspecified span in accordance with EN 1195 (floors) or Annex C (roofs);kdef, yis a modification factor for short-term load duration under test. Normally for service class 1 given in ENV 1995-1-1;kdef, xis a modification factor for load duration in service (kdef, 1; kdef, 2; kdef, 3) depending on the type of wood-based panel,end-use and service class (1, 2 or 3) according to ENV 1995-1-1.SIST EN 12871:2004
Page 13EN 12871:20016.2.2.3.4 Roofing covered with bitumen felts or single-ply membraneThe usual cause of cracking in roofing felts is that the joints between the panels above supports open up due toloading or drying.u £ (L e) / 3tfor load category H(3)where:uis the deflection, in millimetres;eis the acceptable expansion in millimetres of the roofing felt between panels above supports caused by the anglerotation of the loaded panel. For roofing felt, e = 0,5 mm is usually applied;tis the nominal panel thickness, in millimetres;Lis centre to centre distance (span) of the structural roof decking, in millimetres.In addition to the requirement for deflection under concentrated load, this requirement shall be fulfilled also atuniformly distributed load. As the acceptable expansion at uniformly distributed load shall not exceed e, this is equalto a requirement on the panels bending stiffness (EI):EI ³ (q L3 / D) x (t / e) x cos2a(4)where:EIis the bending stiffness parallel to the grain, in kilonewton square millimetres per unit width;qis uniformly distributed load, in kilonewtons per square metre;ais the roof slope angle, in degree;Dis a factor depending on the number of panel support (see figure 1) for example:D = 12
for joint between two single — span — panels;D = 16 for joint between a single span panel and a multi-span panelD = 24 for joint between two multi-span panelsSIST EN 12871:2004
Page 14EN 12871:20016.2.3 Requirements for ultimate limit state6.2.3.1 GeneralWhen tested for concentrated load the ultimate limit state is reached when rupture occurs (Fmax) or maximum loadcannot be sustained.6.2.3.2 Characteristic valueThe 5-percentile characteristic value (Fmax, k, 05) is calculated from the test values according to 7.2.Fmax, k, 05 shall be separately calculated for load points at the joints (e. g. tongued and grooved) and at the panelcentre.6.2.3.3 RequirementThe 5-percentile characteristic value (Fmax, k, 05) shall fulfil the following requirement:Fmax, k, 05 ³ Qk kdis gm/kmod(5)whereQkis the characteristic concentrated load in kilonewtons depending on load categories as specified in ENV 1991-2-1;kdissee 6.2.2.2.3gmis the partial safety factor for the material property, given in ENV 1995-1-1 or in national codes;kmodis a modification factor for load-duration depending on the type of wood-based panel, end-use and service class (1,2 or 3) acording to ENV 1995-1-1.6.2.4 Requirements for impact load6.2.4.1 GeneralWhen tested by impact load, the requirements for serviceability and ultimate limit states are fulfilled when therequirements in 6.2.4.2 are complied with.For structural floor and roof decking, impact testing shall only be carried out if centre to centre distance (span) of thejoists exceeds 300 mm.Each test set-up shall be made using panels of one type, sampled in accordance with 7.1.6.2.4.2 Requirements6.2.4.2.1 Floor decking: Requirements for load categories A, B, C, D and EThe impact test shall be carried out on five test set-ups each of which shall be tested according to the followingsequence of drop heights.The requirements for each stage in the sequence shall be fulfilled and are independent of the service class.When tested with a 150 mm drop height and thereafter with 300 mm drop height none of the test set-ups shall showany damage which can impair the performance of the floor.The serviceability limit state is exceeded if the set at the point of impact, or differential set at the joint, exceeds1 mm.SIST EN 12871:2004
Page 15EN 12871:2001When afterwards tested with a 450 mm drop height, no more than one of the test set-ups shall show damage (visiblecracks).When afterwards tested with a 600 mm drop height no test set-up shall show damage which allows the test bag tofall through.When afterwards tested with a 750 mm drop height no test set-up shall show damage which allows the test bag tofall through.When afterwards tested with 900 mm drop height only one of the test set-ups may show damage which allows thetest bag to fall through.6.2.4.2.2 Roof decking6.2.4.2.2.1 Requirements for load category HThe impact test shall be carried out on five test set-ups each of which shall be tested according to the followingsequence of drop heights.The requirements for each stage in the sequence shall be fulfilled and are independent of the service class.When tested with a 150 mm drop height and with a 300 mm drop height, none of the test set-ups shall show anydamage which can impair the performance of the roof.The serviceability limit state is exceeded, if the set at the point of impact, or differential set at the joint, exceeds1 mm.When afterwards tested with a 450 mm drop height, no more than one of the test set-ups shall show damage (visiblecracks).When afterwards tested with a 600 mm drop height maximum one of the test set ups may show damage whichallows the test bag to fall through the panel.6.2.4.2.2.2 Requirements for load category IImpact test and requirements for load category I is the same as for floor decking, see 6.2.4.2.1.6.3 Structural wall sheathing on studs6.3.1 GeneralThe requirements specified in this standard are intended to limit deformations and prevent damage to wood-basedpanels used for structural sheathing on studs. The standard does not include requirements for the strength andstiffness of supporting studs or frame members.Testing for racking (concentrated) load and impact load shall be carried out according to table 4.As there are no factors given to allow for modifications to the construction, the results of tests in accordance withEN 594 and EN 596 shall be applied only to walls meeting the same specification as those tested.The standard applies only to walls in buildings which are subjected to imposed
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