TechManual November 2013 - James Jones And Sons Limited
JJI-JoistsTECHNICAL MANUALFOURTH EDITIONDECEMBER 2013A Tradition of Innovationwww.jamesjones.co.uk
CONTENTS01INTRODUCTION02THE SYSTEM03GENERAL INFORMATION04ENVIRONMENTAL INFORMATION05JJI-JOISTS08SERVICE HOLES IN JJI-JOISTS09FIRE AND DURABILITY10ACOUSTIC PERFORMANCE AND SCHEDULE OF WEIGHTS11JJ-BEAM AND JJ-RIM (GLULAM)14JJ-BEAM AND JJ-RIM FIXING DETAILS17METALWORK18FLOOR DESIGN19DOMESTIC INTERMEDIATE AND APARTMENT FLOOR SPAN TABLES20HEALTH AND SAFETY – TEMPORARY BRACING21SITE STORAGE AND RESTRICTIONS22INDICATIVE FLOOR DETAILING – F DETAILS31ROOF DESIGN32JJI-JOIST FLAT ROOFS33JJI-JOIST PITCHED RAFTERS35INDICATIVE ROOF DETAILING – R DETAILS38WALL DESIGN39JJI-JOIST THERMAL PERFORMANCE40INDICATIVE WALL DETAILING – W DETAILS41GLOSSARYWe currently offer a face to face seminar on Engineered WoodProducts for Modern Methods of Construction. These areoffered for larger Construction Practises throughout the UKand Ireland.Please visit our website to request a face to face seminar andfind out how to take our online CPD Seminar.Whilst every effort was made to ensure the accuracy of this publication at the time of printingJames Jones & Sons cannot be held responsible for changes to Building Regulations, NHBCStandards etc.For the most up-to-date information please visit our web site:www.jamesjones.co.uk
INTRODUCTIONINTRODUCTION TO JAMES JONES & SONSTHE COMPANYJames Jones & Sons is the UK’s leading manufacturer of I-Joistsbased at its Timber Systems Division in Forres, Morayshire. TheTimber Systems Division prides itself on building strong partnershipsthroughout the supply chain, concentrating on its core values ofquality and service.James Jones & Sons is one of the largest suppliers of British Timberin the UK today. The company’s sawmills are strategically placed totake advantage of the increasing supply of saw logs being producedfrom post war plantations. These are bought from both private andstate owned forests as well as woodlands owned and managed bythe company.JJI-Joists are manufactured under the strictest quality andenvironmental standards, and this new edition of the TechnicalManual outlines the applications and versatility of JJI-Joists. Therange is manufactured to UK sizes and specifications, and is availableon a Just-In-Time basis from a comprehensive stock holding. Theentire production and distribution process has been audited by thirdparty accreditation systems, and a Carbon Footprint assessmentusing a Life Cycle Assessment approach has been carried out toensure full sustainability and environmental compliance.Through the use of our bespoke, dedicated software programmes,JJI-Joists can be specified and engineered to exacting standards, forfloor, wall and roof applications of both domestic and commercialbuildings.JJI-Joists are part of a comprehensive building system and arecomplemented by glulam and metal connectors and this manualhighlights their use and combinations.JJI-Joists are sold through dedicated distributors, merchants, timberframe kit manufacturers and roof truss manufacturers situated acrossthe UK, Ireland and mainland Europe. These combined resources,backed up by dedicated James Jones & Sons personnel, ensure thatthe design, specification and supply of JJI-Joists is seamless and ofthe highest quality.FAMILY CONCERNJames Jones & Sons is a real family business. Even with a staff ofover 500 it has the culture of a family firm. Like any good family,the company cares for its members. That concern extends to wholecommunities in rural areas where the company is a major employer.There is also an equal concern for customer satisfaction. Thecompany’s mission is to maintain the highest standards of qualityand service in the industry.CUTTING EDGEThe company strives to maintain its competitive advantages. Varietyof product is one. Wood is harvested and processed for specificmarkets and end uses such as construction, palletwood, packagingand fencing.James Jones & Sons has a team of highly trained professionalswho look after the purchasing and harvesting of round timber,making sure that the right logs go to the right mill where theycan be processed to best advantage. Good relationships withforest owners are vital and in most cases are of many yearsstanding thus providing the right background for the purchaseof our raw material.Quality comes from modern sawmills staffed by experiencedpeople. James Jones & Sons is fortunate in having manypeople who are experts in their field and who know about andunderstand wood. This ensures the quality of our products ismaintained at the highest level.THE FUTUREROOTSMr James Jones started trading in timber and allied products in themiddle of the nineteenth century. Since being incorporated in 1905,James Jones & Sons has grown both organically and by acquisition. Pallet Manufacture Pallet repair JJI-Joists Sawmilling HarvestingUnited Box Partner in woodproduct manufacturing Pallet Manufacture Pallet repair Joint venture in lumberbusiness: Canada/USAAs well as investing in state-of-the-art technology for our traditionalsawmilling business, James Jones & Sons has taken the strategicdecision to invest in and develop more innovative products. TheJJI-Joist, manufactured by James Jones & Sons, Timber SystemsDivision, is the direct result of one of the new technologies that hasbeen embraced by the company. Following the successful launch ofthe JJI-Joist range in 1999 the Timber Systems Division has added afully automated second production line along with highly efficientfinger jointing and web profiling lines to keep up with demand. Inaddition to the production investment, the Division has also set up atechnical and design office to provide a full design and engineeringsupport service.1
2THE SYSTEMTHE JJI-JOIST SYSTEMSOFTWAREThe JJI-Joist system relies on a unique combination of engineeredproducts designed to compliment each other and deliveroutstanding performance.The JJI-Joist system is fully supported by three Windows basedsoftware packages written in the UK to provide fast and cost effectivedesign solutions for today’s construction industry.JJI-JOISTSThe work horse of the system, a versatile light weight structuralworkhorse ideal for floor joists, rafters, purlins and wall studs.These packages are regularly updated to ensure compliancewith ever changing Building Regulations and Codes of Practice,each new version incorporating new features and developmentsto help the designer maximise the benefits of the system.JoistMaster is an extremely powerful beam design tool, whichenables the specifier to quickly assess the most cost effective joistsolution, tailored to his/her particular design requirements, andprovide a calculation printout suitable for local authority approval.JoistMaster is freely available to download from www.jji-joists.co.ukor www.jamesjones.co.ukFor more information see page 5JJ-BEAM AND JJ-RIM (GLULAM)For the most demanding applications, high strength and stiffnesscombined with dimensional stability make this the ideal choice forheavily loaded members in floors, roofs and walls.FloorMaster is a comprehensive floor design and layout packageallowing trained designers to quickly and accurately producedetailed layout drawings, installation details, material call-offs,calculations and design quotations for any building footprint.FloorMaster export files allow quick and easy intergration into thirdparty CAD and BIM software.For more information see page 11METALWORKA comprehensive range of connectors designed specifically for theJJI-Joist system are available from two approved suppliers.OptiMaster is a stock optimisation package designed to work withthe output from FloorMaster.For more information see page 17
GENERAL INFORMATIONDISTRIBUTIONAPPROVALSThe JJI-Joist system is available from a network of builders/timber merchants and timber frame and engineered timbersystem manufacturers providing local, quality expertise.JJI-Joists are an accepted building material within the constructionindustry thanks to third party certification from BM TRADA EuropeanTechnical Approval.BM TRADA ETA is recognised by NHBC, Local Authority BuildingControl and others.These distributors are trained to use our software andunderstand the correct use and specification of our products.This training is ongoing and ensures our distributors havethe skills required to provide an efficient, cost-effective,JJI-Joist solution.Distributor details s Jones & Sons are founder members of the Structural TimberAssociation, formerly UK Timber Frame Association (UKTFA) and wereinvolved in the drafting of the Code of Practice for the Design ofEngineered Wood Products which provides guidance on the designof structures using I-Joists.JJI-JOISTS STOCKISTS & TECHNICAL SUPPORTRegional SupportStephen Stewart07500 01677321 09252905Greshop Ind. Estate, Forres.IV36 2GWTel 44 1309 67111110242319JJI-Joist Distributor17JJI-Joist Distributor/Cassette ManufacturerTimber Frame KitSupplier13060712QUALITY CONTROL AND QUALITY ASSURANCERegional SupportLynford Chambers07879 8882160203142018Regional SupportPeter Barker07977 283781110422083115 260128France & Belgium301633 34 3527Regional SupportMark Tilston07977 28375632The success of a manufactured product is often determined by itsquality. It is for this reason the James Jones & Sons, Timber SystemsDivision maintains a thorough Quality Management System whichenables us to achieve our goal of producing a consistent anduniform product of exceptionally high standards. JJI-Joists aremanufactured under a Quality Assurance scheme which complieswith ISO 9001:2008 and CE marking.CUSTOMER SERVICES AND TECHNICAL SUPPORTJames Jones & Sons, Timber Systems Division has a highly trainedteam of Technical, Engineering and Sales personnel providing UK andIrish national coverage to ensure simple, safe and quick installation ofJJI-Joist systems. A summary of the services offered is given below. Pre and after sales assistance Engineering support Product training courses Software and design training Building site training Full design and engineering serviceRESEARCH AND DEVELOPMENTJames Jones & Sons are proud of their tradition of innovation andproduct development. Central to the success of the Timber SystemsDivision, is an ongoing research and development programmedesigned to deliver new applications for existing products and toimprove the performance of all products to keep pace within theever changing Building Regulations and Codes of Practice.In addition to this, raw material sourcing and production methodsand technology are continuously reviewed and improved tomaximise product quality and efficiency.3
4ENVIRONMENTAL INFORMATIONENVIRONMENTAL MANAGEMENTCARBON ACCOUNTING & LIFE CYCLE ASSESSMENT (LCA)Environmental considerations are a critical factor in the production ofJJI-Joists. Our certified ISO 14001:2004 Environmental ManagementSystem has enabled the company to target key areas to reduce theimpacts of our activities on the environment.Our third key sustainability element is our PAS 2050:2011 carbonaccounting model which is assured by Ecometrica, the UK leadingGreenhouse Gas specialists, on an annual basis. Not only does thisenable us to measure, compare and reduce our key “trigger” impactsat each stage of the production process but our overall carbonnegative footprint can be applied to individual house design andsupply contract volumes.The introduction of biomass heating systems utilising woodco-products, the continuous commitment to waste minimisation,energy savings and the recycling of materials used, ensures thedelivery of JJI-Joists with the smallest environmental footprintpossible. This in-built consideration of the environment in our currentand future plans has shaped our purchasing policy to choose onlythose technologies that can prevent pollution and improve ourenvironmental performance year on year.The competencies of all our employees enables our environmentalobjectives to be implemented and exceeded every year. A safe,quality driven and improvement culture ensures environmentalperformance is always present at the very centre of all our activities.As environmental considerations affect the whole JJI-Joist supplychain, we are engaged in continuous dialogue with our suppliers anddistributors to minimise potential impact.Our commitment to ISO 14001:2004 from start-up, not onlyguarantees our compliance with all current and forthcominglegislation but delivers a JJI-Joist with excellent and continuallyimproving environmental credentials.SUSTAINABLE TIMBER SOURCING & CHAIN OFCUSTODYThe UK Government policy on timber purchasing has stated thattimber should only be purchased from legal and sustainable sources.Increasingly, both public and private sectors are encouraged tofollow this policy.Sustainable timber supply has always been integral to themanufacture of our engineered wood products. ConsequentlyJJI-Joists are able to be specified as FSC Certified. All productclaims are independently verified by BM TRADA Certification on anon-going basis.Within the James Jones Group and via our trade body Confor, wework closely with both FSC & PEFC to ensure any future requirementsare complied with. James Jones Harvesting Division and our TimberSystems Division Chain of Custody systems enable all clients to havefull traceability to source to guarantee supply chain legality andsustainability. Consequently our JJI-Joists are both EUTR compliantand are derived from known and trusted sources.Our LCA measurements enable our environmental performanceprofile to be measured and improved upon by assessing allenvironmental impacts associated with the sourcing, transport andmanufacture of our product i.e. from the forest to the end user.JJI-Joists can help to mitigate climate change as timber acts as acarbon sink. Carbon dioxide (CO2) is absorbed by trees and used tocreate wood. This CO2 is only released back into the environmentwhen the joists come to the end of their lifetime. As only sustainabletimber is used for the production of JJI-Joists, other trees are plantedto replace harvested ones immediately, closing the CO2 cycle andcontributing to keep a constant or even increasing volume of CO2locked away from the atmosphere where it cannot contribute toclimate change. Increasingly supply chain partnerships are beingdeveloped with key clients to enable our quantified carbon negativesupply to support and contribute to downstream Corporate SocialResponsibility (CSR) commitmentsImproved supply logistics, new resin formulations and improvedbiomass heating efficiencies are recent examples of targeted andquantifiable improvements within the life-cycle performance of ourJJI-JoistsOur carbon accounting complements the generic schemesused to quantify environmental impacts of products such as BREenvironmental profiles. Scores for this scheme are used in theassessment process of 'The Code for Sustainable Homes' in Englandand Wales and 'Ecohomes' in Scotland. Timber I-joists such asJJI-Joists achieve the best scores in this scheme (A ) and thereforecan help specifiers to achieve their “Zero Carbon” construction goals.THERMAL PERFORMANCEOther advantages of using JJI-Joists are their superiorstrength-to -weight ratio and readily available deep sections (up to450mm) when compared with solid timber. In this way more insulationcan be used within the building envelope and significant savings inheating can be achieved.The thin web used in JJI-Joists contributes to minimise repeatedthermal bridging in timber frame structures enabling JJI-Joists toachieve better U-values than solid timber. This property makesJJI-Joists ideal as a structural member in roofs and walls in low energybuildings.BMT-PEFC-0105The UK government has already expressed its preference for betterinsulated and airtight building envelopes as a way to reduce energyconsumption. The adoption of insulated structures using JJI-Joistsand designed according to principles such as Passivhaus cansignificantly reduce the energy requirements for heating and thisapproach will be essential to achieve a truly Zero Carbon House.
JJI-JOISTSINTRODUCTIONJJI-JOIST RANGE AND TOLERANCESA JJI-Joist is a composite engineered timber joist, combining 45mmdeep high-grade finger jointed softwood flanges (C24) with a 9mmthick oriented strand board (OSB/3) web. Four flange widths areavailable at 47, 63, 72 and 97mm wide.JJI-Joists are available in a comprehensive range of sizes, designedspecifically for the UK market. JJI-Joists are available in lengths ofup to 12m.COMPOSITIONJJI-JOIST FLANGE SIZESA B CD45mmSoftwood flanges9mm OSB/3 WebHigh tensile and compressivestrength is used to carry thebending loads which aregreatest at the top andbottom of the sectionHigh shear strength is usedto carry the shear loads whichare greatest at the mid depthof the section45mm47mmThese materials have different specific properties and by combiningthe two materials in this way to form a composite section you canuse the strengths of each one where it is needed most. This, resultsin the new section outperforming the individual materials thatit is made from (the sum is greater than its parts) making it morestructurally efficient.Using advanced technology these components are combined toproduce an innovative alternative to conventional constructiontimber with many additional advantages.ADVANTAGESJJI-Joists are designed to give a superior strength to weight ratioenabling the manufacture of longer and lighter structural members.The JJI-Joist, with a softwood flange: Is capable of spanning longer distances Is easier to handle Is easier to fix and nail Is less prone to splitting Is quicker to install Is extremely stable Reduces building maintenance Provides a less complex design solution Is simple to specify using superior software Has Part E compliant details available Is FSC/PEFC accredited Has very low embodied energy Has independently assured carbon accounting toPAS2050:2011Joist Depth(mm)63mm72mm97mmJJI-Joist Flange SizesA 47mm145 195 B 63mmC72mmD97mm TimberGradeC24C24220 C24235 C24245 C24300 C24350 C24400 C24450 C24Table 1. JJI-Joist Product RangeMember DimensionTolerance (mm)Overall Joist Length /-3.0Overall Joist Depth /-2.0Flange Thickness/Depth /-2.0Web Thickness /-0.8Table 2. JJI-Joist Manufacturing ToleranceJJI-JOIST IDENTIFICATION AND MARKINGJJI-Joists are identified by an alpha numeric code that specifiesthe joist depth, flange size and flange grade (see example below).This code is printed at regular intervals along the centre line of theweb along with the production time and date to facilitate on-siteidentification and traceability.IDJJI195 B p‘B ’ Flange63mm WideProductionBatch CodeIn addition to the above information, the clear warning 'DO NOTCUT FLANGES' is printed along the length of each flange as aprecaution against creating unnecessary structural damage.5
6JJI-JOISTSJJI-JOIST PROPERTIESIt is possible to design JJI-Joist structures using either a PermissibleStress Design Code (BS 5268-2) or a Limit State Design Code(EN1995-1-1/Eurocode 5). Each code requires properties that arederived and presented in a different way.Joist TypePermissible stress design properties, intended for use with BS 5268-2and characteristic capacities, intended for use with Eurocode 5, canbe found in BM TRADA ETA /SN/SW/SW(mm)(kNm)(109 Intermediate bearingcapacity – minimum89mm bearing lengthEnd bearing capacity– minimum 45mmbearing lengthEnd bearing capacity– minimum 89mmbearing lengthWeightper metrelengthJJI 145 A 1451.64139.63.120.5505.366.922.783.603.384.55JJI 195 A .05424.73.870.9077.189.283.735.274.316.103.21JJI 195 B JJI 195 I 19
JJI-Joists are manufactured under the strictest quality and environmental standards, and this new edition of the Technical Manual outlines the applications and versatility of JJI-Joists. The range is manufactured to UK sizes and specifications, and is available on a Just-In-Time basis from a comprehensive stock holding. The
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