2.3 Selection of panels for specific end use: general ...
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1 PanelGuide (V4) Section 2.3 2.3 Selection of panels for specific end use: general requirements In the selection of panels for specific end uses, a number of criteria must be considered and satisfied (Figure 2.1) including: • Is the panel to be permanently incorporated into a construction and hence subject to the Construction Products Regulation (CPR)? For products outside of the scope of CPR, for example furniture, the product must meet the specification agreed between supplier and customer and must be fit for the intended purpose, but compliance with BS EN 13986 is not required unless this forms part of the agreed speci‑ fication. • Since July 2013, when the CPR came into force, wood‑based panels for use in construction must meet the requirements of the harmonised European standard BS EN 13986 for wood‑based panels. An alternative, voluntary route to gaining a CE mark, for wood‑based panels that are outside the scope of BS EN 13986, is through issuing a European Technical Assessment (ETA) by a suitable Technical Assessment Body (TAB). In support of the CE mark, the manufacturer must prepare a Declaration of Performance (DoP) listing the properties of the panel and must have a Factory Production Control (FPC) system in place to ensure that the properties in the DoP are maintained. • The CE mark will make it clear whether the product is intended for structural or non‑structural use and whether it is suitable for specific applications, such as flooring, roofing or wall sheathing. • Structural panels must be capable of carrying the imposed loads as set out in Eurocode 1 and Eurocode 0 if design is by limit state according to Eurocode 5, or to meet specific loads where known. (Where design is being carried out to BS 5268-2 the imposed loads should be taken from BS 6399.) Demonstration of the panel’s ability to carry the loads may be calculation based on material characteristic properties or by performance testing for specific end uses. • The panels must be appropriate for the ambient environmental conditions of the projected end use. Panels in the following tables are listed according to use in one of three service classes. The Service Class system is mainly aimed at assigning strength values and for calculating deformations under defined envi‑ ronmental conditions. The appropriate service class will be designated in the CE mark. – Service Class 1: is characterised by a moisture content in the materials corresponding to a temperature of 20ºC and the relative humidity of the surrounding air only exceeding 65% for a few weeks per year. (Note: in Service Class 1 the average moisture content in most panels will not exceed 11%.) – Service Class 2: is characterised by a moisture content in the materials corresponding to a temperature of 20ºC and the relative humidity of the surrounding air only exceeding 85% for a few weeks per year. (Note: in Service Class 2 the average moisture content in most panels will not exceed 15%.) – Service Class 3: climatic conditions leading to higher moisture contents than in Service Class 2. Further criteria relating to other properties, for example thermal conductivity, vapour permeability, durability, dimensional stability and sound absorption, may also have to be taken into account in the selection of panels for particular applications. Tables in the following sections set out the types and grades of panels that are available for specific end uses within construction, given a particular load level and a particular environmental condition. It should be appreciated that: • These tables give the minimum grade of panel that will satisfy a particular set of requirements. Panels of higher quality than the minimum may be substituted, and in certain circumstances their selection may result in a reduced thickness of panel being used. • Although all the panels meeting the grade speci‑ fications in a particular table satisfy the particular requirements, the level of performance of different brands of these panels may vary considerably. Moreover some may be endowed with high levels of properties not included in the tables, such as thermal conductivity, or sound absorption; these properties may be listed in the DoP. • The design of structures using any one of these panels is dependent on the availability of the relevant design stresses and their subsequent modification to account for environmental factors and duration of load. These factors in design should be included in the DoP and are discussed further in Section 2.2.
Transcript of 2.3 Selection of panels for specific end use: general ...
1PanelGuide (V4) Section 2.3
2.3 Selection of panels for specific end use: general requirementsIn the selection of panels for specific end uses, a number of criteria must be considered and satisfied (Figure 2.1) including:
• Is the panel to be permanently incorporated into a construction and hence subject to the Construction Products Regulation (CPR)? For products outside of the scope of CPR, for example furniture, the product must meet the specification agreed between supplier and customer and must be fit for the intended purpose, but compliance with BS EN 13986 is not required unless this forms part of the agreed speci‑fication.
• Since July 2013, when the CPR came into force, wood‑based panels for use in construction must meet the requirements of the harmonised European standard BS EN 13986 for wood‑based panels. An alternative, voluntary route to gaining a CE mark, for wood‑based panels that are outside the scope of BS EN 13986, is through issuing a European Technical Assessment (ETA) by a suitable Technical Assessment Body (TAB). In support of the CE mark, the manufacturer must prepare a Declaration of Performance (DoP) listing the properties of the panel and must have a Factory Production Control (FPC) system in place to ensure that the properties in the DoP are maintained.
• The CE mark will make it clear whether the product is intended for structural or non‑structural use and whether it is suitable for specific applications, such as flooring, roofing or wall sheathing.
• Structural panels must be capable of carrying the imposed loads as set out in Eurocode 1 and Eurocode 0 if design is by limit state according to Eurocode 5, or to meet specific loads where known. (Where design is being carried out to BS 5268-2 the imposed loads should be taken from BS 6399.) Demonstration of the panel’s ability to carry the loads may be calculation based on material characteristic properties or by performance testing for specific end uses.
• The panels must be appropriate for the ambient environmental conditions of the projected end use. Panels in the following tables are listed according to use in one of three service classes. The Service Class system is mainly aimed at assigning strength values and for calculating deformations under defined envi‑ronmental conditions. The appropriate service class will be designated in the CE mark.
– Service Class 1: is characterised by a moisture content in the materials corresponding to a temperature of 20ºC and the relative humidity of the surrounding air only exceeding 65% for a few weeks per year. (Note: in Service Class 1 the average moisture content in most panels will not exceed 11%.)
– Service Class 2: is characterised by a moisture content in the materials corresponding to a temperature of 20ºC and the relative humidity of the surrounding air only exceeding 85% for a few weeks per year. (Note: in Service Class 2 the average moisture content in most panels will not exceed 15%.)
– Service Class 3: climatic conditions leading to higher moisture contents than in Service Class 2.
Further criteria relating to other properties, for example thermal conductivity, vapour permeability, durability, dimensional stability and sound absorption, may also have to be taken into account in the selection of panels for particular applications.
Tables in the following sections set out the types and grades of panels that are available for specific end uses within construction, given a particular load level and a particular environmental condition.
It should be appreciated that:
• These tables give the minimum grade of panel that will satisfy a particular set of requirements. Panels of higher quality than the minimum may be substituted, and in certain circumstances their selection may result in a reduced thickness of panel being used.
• Although all the panels meeting the grade speci‑fications in a particular table satisfy the particular requirements, the level of performance of different brands of these panels may vary considerably. Moreover some may be endowed with high levels of properties not included in the tables, such as thermal conductivity, or sound absorption; these properties may be listed in the DoP.
• The design of structures using any one of these panels is dependent on the availability of the relevant design stresses and their subsequent modification to account for environmental factors and duration of load. These factors in design should be included in the DoP and are discussed further in Section 2.2.
2PanelGuide (V4) Section 2.3
– CPR– UK Building Regs– Eurocode 1 (or BS 6399)
Establish criteria
Select panel
Design
Panels must comply with the CPR ie CE mark
Determining factors– moisture– load levels– duration of load– durability– end use
User specifications
Determining factors– moisture– durability– appearance– ease of working– surface finish– strength– dimensional tolerances
End-use application
Structural(load-bearing) Non-structural
Construction Non-construction
Select load-bearing boards taking into account– moisture level (Service Class)– load level– duration of load– end use
Select from full range of boards taking into account– moisture level (Service Class)– durability– ease of working– appearance
Design
CalculationUsing performance(prototype) testing Evaluate performance
– against performance– life expectancy– cost and installation
EN 12871 (or BS 5268-2 section 8)
ActionProduce contractual specification to cover– marking requirement– panel type– quality assurance
Select product– general purpose boards– end-use specific boards
Permissible stress design to BS 5268-2 (now withdrawn)
Limit State Design to Eurocode 5 (EN 1995-1-1)
Figure 2.1: Panel selection and use
PanelGuide (V4)
PanelGuide Version 4.1ISBN 978-1-909594-21-0
Published in 2014 by the Wood Panel Industries Federation, TRADA Technology Ltd, and the National Panel Products Division (a division of the Timber Trades Federation).
Revised with amendments to Section 2 and Annex 3, 2018
Previous editions are listed in Annex 4 of the PanelGuide
This is a technical book for professionals in the built environment sector. While every effort is made to ensure the accuracy of the advice given, the project partners cannot accept liability for loss or damage however caused arising from the use of the information supplied
All rights reserved. PanelGuide may be downloaded and printed for single use only. You must request the permission of the copyright owners if you wish to extract content from the PanelGuide or use it for any other purpose
© Wood Panel Industries Federation, Warringtonfire Testing and Certification Ltd and the National Panel Products Division (a division of the Timber Trades Federation)
Unless otherwise stated in the caption, all photographs and illustrations included in the Panel Guide are © Wood Panel Industries Federation, Warringtonfire Testing and Certification Ltd and the National Panel Products Division
Revisions to PanelGuide Version 4 contributed by Ian Rochester (WPIF), Vic Kearley (BM TRADA) and Nick Boulton (TTF)
Produced by the publishing team at BM TRADA, the official publisher for the Timber Research and Development Association
Contact details for the PanelGuide project partners are:
WOODPANELINDUSTRIESFEDERATION
Wood Panel Industries FederationAutumn Business ParkDysart RoadGranthamLincsNG31 7EUTel: 01476 512 381Email: [email protected]: www.wpif.org.uk
Timber Research and Development AssociationChiltern HouseStocking LaneHughenden ValleyHigh WycombeBucksHP14 4NDTel: 01494 569 603Email: [email protected]: www.trada.co.uk
National Panel Products DivisionTimber Trades FederationThe Building Centre26 Store StreetLondonWC1E 7BTTel: 020 3205 0067Email: [email protected]: www.ttf.co.uk
Produced by BM TRADA, the official publisher for TRADA
Email: [email protected]: www.bmtrada.com
