DOCSLIB.ORG

Mitek Guidefor ROOF Trussinstallation

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text

Load more

TIMBER ROOF TRUSSES MiTek GUIDE for ROOF TRUSS Installation The Timber Roof Trusses you are about to install have been manufactured to engineering standards. To ensure that the trusses perform, it is essential that they be handled, erected and braced correctly. 2019 - Issue 1 mitek.com.au TABLE OF CONTENTS Fixing & Bracing Guidelines For Timber Roof Trusses General .....................................................................................................................................................................................3 Design ......................................................................................................................................................................................3 Transport..................................................................................................................................................................................3 Job Storage ..............................................................................................................................................................................3 Roof Layout .............................................................................................................................................................................4 Erection and Fixing ...................................................................................................................................................................4 Girder and Dutch Hip Girder Trusses .......................................................................................................................................7 Saddle Truss Fixing ................................................................................................................................................................11 Roofing Battens .....................................................................................................................................................................12 Permanent Bracing ................................................................................................................................................................12 Web Ties and Stiffeners .........................................................................................................................................................17 Girder Brackets ......................................................................................................................................................................20 Guard Rail Systems ...............................................................................................................................................................26 MiTek 20/20 User Guide .........................................................................................................................................................28 Truss Installation Checklist ....................................................................................................................................................32 Product Certification ..............................................................................................................................................................32 ILLUSTRATIONS All technical illustrations in this Guide have been converted to pdf, AutoCAD 2000 dwg & dxf file formats. They are also compatible for use with MiTek SAPPHIRE™ - making them the ideal, easy reference for installation instructions and data. To access these illustrations, please visit: mitek.com.au GENERAL JOB STORAGE AND LIFTING The roof trusses you are about to install have been manufactured to Trusses should be inspected on arrival at site. Any damaged trusses engineering standards. To ensure that the trusses perform as designed should be reported immediately and not site repaired without approval of it is essential that they be handled, erected and braced correctly. the truss fabricator. The installation of prefabricated timber trusses is covered by the Australian Where it is anticipated that trusses will be stored on site for an extended Standard AS 4440 “Installation of NailPlated Timber Trusses”. The following period of time before use, adequate provision should be made to protect information is an abbreviated set of instructions designed to assist trusses against the effects of weather. with on site work and is not intended to replace the need to reference Once trusses are installed they should not be left exposed to weather for long AS 4440. The following recommendations apply to roof trusses on standard periods. Repeated wetting and drying has a detrimental effect on the strength domestic buildings where truss design details are obtained from MiTek of both timber and connection. engineering programs. Details for commercial, industrial and non standard Protective covering, where used, should allow free air circulation around trusses. domestic buildings, are to be provided by an Engineer responsible for the overall building design. Trusses when stored on the job site should be on timber fillets clear off the ground and in a flat position to avoid distortion. DESIGN When lifting, care must be taken to avoid damaging of joints and timber. 1. Trusses are designed for normal roof, ceiling and wind loads to suit specific Spreader bars with attachment to the panel points should be used where jobs and conditions. Additional loading such as Solar Units, Hot Water span exceeds 9000 mm. Never lift by the apex joint only. Tanks, Air Conditioning, etc. require special consideration. Advice should The trusses may also be placed on the top plates by pulling them up on skids, be sought from the truss fabricator prior to commencing construction. spread at 3000 mm, taking the same precaution as described above. 2. Wall frames and beams supporting trusses must be designed for the correct Ensure that the trusses are not distorted or allowed to sag between supports. roof loads. Refer AS 1684 “Residential Timber-Framed Construction” The recommended method of lifting trusses will depend on a number of factors, for details. including truss length and shape. 3. Wind load is an important factor in the design and performance of roof In general, sling truss from top chord panel points as shown below. trusses. Ensure that you have correctly advised the truss fabricator with Slings should be located at equal distance from truss centreline and be regard to wind load requirements and that adequate provision has been approximately 1/3 to 1/2 truss length apart. made to fix trusses to the support structure to withstand wind uplift forces. The angle between sling legs should be 60° or less and where truss spans 4. Trusses are generally designed to be supported on the outer wall with inner are greater than 9000 mm a spreader bar or StrongBack should be used. walls being non load bearing. Where it is necessary to use internal walls Some typical examples are shown below. for load bearing, these will be clearly shown on layouts. Note that the supporting structure is stable in its own right. 5. Before ordering trusses, ensure that your particular requirements have been provided for and that all relevant information has been supplied to 60° or less the truss manufacturer. If non standard trusses are being used, ensure that erection and bracing details are known before erection commences. RT001-a 6. For environments where the atmosphere may be conducive to corrosion, such as some types of industrial and agricultural buildings, or buildings near the ocean and subject to salt spray, consideration should be given to the use of G8S stainless steel connector plates. Approx 1/2 to 1/3 Important Note of truss length 1. It is the Builder’s responsibility to ensure that all relevant information required for design is provided to the fabricator at time of ordering trusses, including spans, pitches, profiles, quantities and loadings. Final confirmation of details by the fabricator with the builder is recommended prior to manufacture. RT001-b 2. Trusses are designed to be part of a structural system, which includes battens/purlins, bracing, binders, fascias and the connection of these components. The full strength of trusses is not achieved until all components are installed correctly. All trusses must braced (temporary and permanently) and stabilised throughout installation of the roof truss system. No truss should be loaded until all permanent bracing is fixed and battens/purlins are installed. Installers should not stand on any truss until all temporary bracing is fixed in place and the truss is stabilised in RT001-c accordance with the following instructions. 3. A risk assessment shall be undertaken for each site taking into account Spreader bar all relevant workplace safety practices, including working height. It is the builders responsibility to consider the site conditions when determining procedures for handling, lifting, fixing and bracing of roof components. The procedures shall be discussed with all employees and sub contractors working on site and the agreed methods documented. A useful template RT001-d for this purpose is the “Safe Working Method Statement No. 10” which is published by the Housing Industry Association (HIA) and available on Approx 1/2 to 1/3 their website. “The National Code of Practice for the Prevention of Falls in of truss length Housing Construction” produced by Safe Work Australia contains specific Spreader bar information and guidance on risk management for working at height in
Recommended publications
  • Truss Deflection

    Truss Deflection

    Truss Deflection Truss deflection may be something you do not give much thought to when designing trusses. Unfortunately, meeting the code permitted deflection ratio does not always guarantee satisfactory performance. Regardless of what the codes say, most people regard large levels of deflection as a sign of structural deficiency. Paying attention to deflection may be the key to whether your customer is satisfied with you as a supplier and continues to buy your products. Deflection of a truss is generally based on the amount of vertical movement from its original position due to the loads applied to the members. The amount of deflection depends on the span and stiffness of the members, and the magnitude of the loads applied. Codes provide the maximum allowable deflection limits for floor and roof trusses, which is based solely on the truss span. Generally, for roof trusses, the deflection in inches due to live load cannot exceed the span in inches divided by 240 (L/240) and due to total load L/180. For floor trusses, the deflection in inches due to live load cannot exceed the span in inches divided by 360 (L/360) and due to total load L/240. To meet code deflection criteria, a 40-foot span roof truss could have live load deflection 2 inches, which does not ensure satisfactory performance. MiTek engineers recommend using the deflection limits listed below. Page 1 of 5 10 /12 /20 20 Truss Deflection Roof Trusses should use the following settings: In MiTek 20/20 Engineering go to Setup – Job – Design Info – Deflection: In Structure with Truss Design go to File – Setup – Job Properties - Job Settings – Design – Building Code Settings: Please note the settings for cantilever and overhang are half that of the main span.
  • BUILDING CONSTRUCTION NOTES.Pdf

    BUILDING CONSTRUCTION NOTES.Pdf

    10/21/2014 BUILDING CONSTRUCTION RIO HONDO TRUCK ACADEMY Why do firefighters need to know about Building Construction???? We must understand Building Construction to help us understand the behavior of buildings under fire conditions. Having a fundamental knowledge of buildings is an essential component of the decisiondecision--makingmaking process in successful fireground operations. We have to realize that newer construction methods are not in harmony with fire suppression operations. According to NFPA 1001: Standard for FireFighter Professional Qualifications Firefighter 1 Level ––BasicBasic Construction of doors, windows, and walls and the operation of doors, windows, and locks ––IndicatorsIndicators of potential collapse or roof failure ––EffectsEffects of construction type and elapsed time under fire conditions on structural integrity 1 10/21/2014 NFPA 1001 Firefighter 2 Level ––DangerousDangerous building conditions created by fire and suppression activities ––IndicatorsIndicators of building collapse ––EffectsEffects of fire and suppression activities on wood, masonry, cast iron, steel, reinforced concrete, gypsum wallboard, glass and plaster on lath Money, Money, Money….. Everything comes down to MONEY, including building construction. As John Mittendorf says “ Although certain types of building construction are currently popular with architects, modern practices will be inevitably be replaced by newer, more efficient, more costcost--effectiveeffective methods ”” Considerations include: ––CostCost of Labor ––EquipmentEquipment
  • Gable Shed Building Guide by John Shank, Owner of Shedking, LLC 2016

    Gable Shed Building Guide by John Shank, Owner of Shedking, LLC 2016

    Shedking's Gable Shed Building Guide by John Shank, owner of shedking, LLC 2016 This shed building guide should be used in conjunction with the gable shed plans available at my website shedking.net . These sheds can be used to build storage sheds, chicken coops, playhouses, tiny houses, garden sheds and much more! I have tried to make this guide as simple as possible, and I have tried to make my building plans as comprehensive and easy as possible to follow and understand. If at any time anything presented in the plans or building guide is not clear to you please contact me at [email protected]. As I always advise, please get a building permit and have your plans inspected and gone over by your local building inspector. Many counties in the United States do not require a permit for structures under a certain square footage, but it is still very wise to get the advise of your local building department no matter what the size of the structure. Email: [email protected] 1 Copyright 2016shedking.net If after purchasing a set of my plans and you want to know if they are good for your county, I won't be able to answer that question! All my plans are written utilizing standard building practices, but I cannot write my plans so that they satisfy every local building code. Safety is and should be your number one concern when building any outdoor structure. Table of Contents Disclaimer....................................................................................................................3 Wooden Shed Floor Construction.....................................................................................4
  • Truss Terminology

    Truss Terminology

    TRUSS TERMINOLOGY BEARING WIDTH The width dimension of the member OVERHANG The extension of the top chord beyond the providing support for the truss (usually 3 1/2” or 5 1/2”). heel joint. Bearing must occur at a truss joint location. PANEL The chord segment between two adjacent joints. CANTILEVER That structural portion of a truss which extends PANEL POINT The point of intersection of a chord with the beyond the support. The cantilever dimension is measured web or webs. from the outside face of the support to the heel joint. Note that the cantilever is different from the overhang. PEAK Highest point on a truss where the sloped top chords meet. CAMBER An upward vertical displacement built into a truss bottom chord to compensate for defl ection due to dead load. PLATE Either horizontal 2x member at the top of a stud wall offering bearing for trusses or a shortened form of connector CHORDS The outer members of a truss that defi ne the plate, depending on usage of the word. envelope or shape. PLUMB CUT Top chord cut to provide for vertical (plumb) TOP CHORD An inclined or horizontal member that establishes installation of fascia. the upper edge of a truss. This member is subjected to compressive and bending stresses. SCARF CUT For pitched trusses only – the sloping cut of upper portion of the bottom chord at the heel joint. BOTTOM CHORD The horizontal (and inclined, ie. scissor trusses) member defi ning the lower edge of a truss, carrying SLOPE (PITCH) The units of horizontal run, in one unit of ceiling loads where applicable.
  • Sealing Air Leaks and Adding Attic Insulation

    Sealing Air Leaks and Adding Attic Insulation

    For more information United States Office of Air and Radiation www.energystar.gov. Environmental (6202A) EPA 430-F-04-024 Protection Agency July 2016 Recycled/Recyclable – Printed with Vegetable Oil Based Inks on Recycled Paper (Minimum 50% Post-consumer Content) A DO-IT-YOURSELF GUIDE TO SEALING AND INSULATING WITH ENERGY STAR® SEALING AIR LEAKS AND ADDING ATTIC INSULATION CONTENTS Locating Air Leaks 1.2 Getting Started 1.4 Sealing Attic Air Leaks 1.6 Additional Sources of Air Leaks 2.1 Sealing Basement Air Leaks 3.1 Adding Attic Insulation 4.1 Sealing and Insulating your home is When you see products or services with ® one of the most cost-effective ways the ENERGY STAR label, you know they to make a home more comfortable meet strict energy efficiency guidelines and energy efficient—and you can set by the U.S. Environmental Protection do it yourself. Agency (EPA) and the U.S. Department of Energy (DOE). Since using less energy Use This Guide To: reduces greenhouse gas emissions and improves air quality, choosing ENERGY 1. Learn how to find and seal hidden STAR is one way you can do your part to attic and basement air leaks protect our planet for future generations. 2. Determine if your attic insulation is adequate, and learn how to For more information visit: add more www.energystar.gov. 3. Make sure your improvements The U.S. EPA wishes to thank The Family are done safely Handyman Magazine for their contribution 4. Reduce energy bills and help of photographs and content for this guide.
  • LP Solidstart LVL Technical Guide

    LP Solidstart LVL Technical Guide

    U.S. Technical Guide L P S o l i d S t a r t LV L Technical Guide 2900Fb-2.0E Please verify availability with the LP SolidStart Engineered Wood Products distributor in your area prior to specifying these products. Introduction Designed to Outperform Traditional Lumber LP® SolidStart® Laminated Veneer Lumber (LVL) is a vast SOFTWARE FOR EASY, RELIABLE DESIGN improvement over traditional lumber. Problems that naturally occur as Our design/specification software enhances your in-house sawn lumber dries — twisting, splitting, checking, crowning and warping — design capabilities. It ofers accurate designs for a wide variety of are greatly reduced. applications with interfaces for printed output or plotted drawings. Through our distributors, we ofer component design review services THE STRENGTH IS IN THE ENGINEERING for designs using LP SolidStart Engineered Wood Products. LP SolidStart LVL is made from ultrasonically and visually graded veneers arranged in a specific pattern to maximize the strength and CODE EVALUATION stifness of the veneers and to disperse the naturally occurring LP SolidStart Laminated Veneer Lumber has been evaluated for characteristics of wood, such as knots, that can weaken a sawn lumber compliance with major US building codes. For the most current code beam. The veneers are then bonded with waterproof adhesives under reports, contact your LP SolidStart Engineered Wood Products pressure and heat. LP SolidStart LVL beams are exceptionally strong, distributor, visit LPCorp.com or for: solid and straight, making them excellent for most primary load- • ICC-ES evaluation report ESR-2403 visit www.icc-es.org carrying beam applications. • APA product report PR-L280 visit www.apawood.org LP SolidStart LVL 2900F -2.0E: AVAILABLE SIZES b FRIEND TO THE ENVIRONMENT LP SolidStart LVL 2900F -2.0E is available in a range of depths and b LP SolidStart LVL is a building material with built-in lengths, and is available in standard thicknesses of 1-3/4" and 3-1/2".
  • Glossary of Architectural Terms Apex

    Glossary of Architectural Terms Apex

    Glossary of Architectural Terms Apex: The highest point or peak in the gable Column: A vertical, cylindrical or square front. supporting member, usually with a classical Arcade: A range of spaces supported on piers capital. or columns, generally standing away from a wall Coping: The capping member of a wall or and often supporting a roof or upper story. parapet. Arch: A curved construction that spans an Construction: The act of adding to a structure opening and supports the weight above it. or the erection of a new principal or accessory Awning: Any roof like structure made of cloth, structure to a property or site. metal, or other material attached to a building Cornice: The horizontal projecting part crowning and erected over a window, doorway, etc., in the wall of a building. such a manner as to permit its being raised or Course: A horizontal layer or row of stones retracted to a position against the building, when or bricks in a wall. This can be projected or not in use. recessed. The orientation of bricks can vary. Bay: A compartment projecting from an exterior Cupola: A small structure on top of a roof or wall containing a window or set of windows. building. Bay Window: A window projecting from the Decorative Windows: Historic windows that body of a building. A “squared bay” has sides at possess special architectural value, or contribute right angles to the building; a “slanted bay” has to the building’s historic, cultural, or aesthetic slanted sides, also called an “octagonal” bay. If character. Decorative windows are those with segmental or semicircular in plan, it is a “bow” leaded glass, art glass, stained glass, beveled window.
  • Steel Joists and Joist Girders

    Steel Joists and Joist Girders

    Steel Joists and Joist Girders • Fully updated to SJI 43rd Edition Standard Specifications • Load and weight tables for K, LH, DLH-Series and Joist Girders • Economical Design Guide load tables for lowest cost joist selection Introduction Table of Contents General JoistGeneral Introduction to Products and Services ....................................... 2 Information General Joist Information ......................................................... 7 SJI Bridging Tables Standard Joist Details Design Guide Sloped Seat Requirements Economical Standard and Special Joist Profiles Duct Opening Sizes Standard Bridging Details OSHA Highlights Ext., K-Series Top Chord Top Standard Joist Girder Details and Notes Load Zone Joists Bill of Materials Instructions Bill of Materials Joist Substitutes & Outriggers Economical Design Guide .......................................................26 LRFD and ASD Design Advantages Definition of Span Economical Load Tables KCS Joists KCS Top Chord Extensions, K-Series .............................................. 67 Joist Substitutes and Outriggers, K-Series ...............................70 Load Tables Load Tables KCS Joists ................................................................................ 74 Joist LRFD Joist LRFD Load Tables ............................................................78 K-Series LH-Series Load Tables DLH-Series Joist ASD Joist ASD Load Tables ............................................................ 91 K-Series LH-Series Tables Weight Load/Load DLH-Series Pages identified
  • Residential Hip Roof Framing Using Cold-Formed Steel Members I

    Residential Hip Roof Framing Using Cold-Formed Steel Members I

    Residential Hip Roof Framing Using Cold-Formed Steel Members RESEARCH REPORT RP06-2 2006 American Iron and Steel Institute research report Residential Hip Roof Framing Using Cold-Formed Steel Members i DISCLAIMER The material contained herein has been developed by researchers based on their research findings and is for general information only. The information in it should not be used without first securing competent advice with respect to its suitability for any given application. The publication of the information is not intended as a representation or warranty on the part of the American Iron and Steel Institute, Steel Framing Alliance, or of any other person named herein, that the information is suitable for any general or particular use or of freedom from infringement of any patent or patents. Anyone making use of the information assumes all liability arising from such use. Copyright 2006 American Iron and Steel Institute / Steel Framing Alliance ii Residential Hip Roof Framing Using Cold-Formed Steel Members PREFACE The objectives of this project were to investigate a more rational rafter design methodology for both gable and hip roofs and develop all the necessary tables, details and specification requirements for hip roof framing members and connections for addition to the AISI Standard for Cold-Formed Steel framing – Prescriptive Method for One and Two Family Dwellings [Prescriptive Method]. This report accomplishes these objectives, provides useful insight and suggests future study topics that should assist in identifying and prioritizing future research needs. It is expected that portions of this report will indeed be incorporated in the Prescriptive Method. As such, the results of this work will have a lasting and beneficial impact on the steel- framed residential construction industry.
  • Elevation Drawings EXTERIOR HOUSE FAÇADE Elevations

    Elevation Drawings EXTERIOR HOUSE FAÇADE Elevations

    Elevation drawings EXTERIOR HOUSE FAÇADE Elevations Elevation – Drawing of the exterior of a structure. Typically front, back an side views. Elevations Terms & Definitions Grade line – the spot where the soil surface strikes the building; the reference point for most elevations Cornice – the part of the roof that extends out from the wall, sometimes referred to as the eave Eave – the lower part of the roof that projects from the wall, sometimes referred to as the cornice ElevationsTerms & Definitions Roof ridge – the uppermost area of two intersecting roof planes Roof ridge – the uppermost area of two intersecting roof planes Rail – decorative barriers and supports typically used to enclose porches and decks Roof Plans Terms & Definitions •Flat roof – common in areas with little rain or snow •Shed roof – offers the same simplicity and economical construction methods as a flat roof but does not have the drainage problems associated with a flat roof Roof Plans Terms & Definitions •Gable roof – one of the most common roof types in residential construction; constructed with two sloping sides that meet to form a ridge •Gambrel roof – a traditional shape that dates back to the colonial period; the lower level is covered with a steep roof surface, which connects into the upper roof system with a slighter pitch Roof Plans Terms & Definitions •Mansard roof – similar to a gambrel roof with the angled lower roof on all four sides rather than just two •Dutch hip roof – a combination between a hip roof and a gable roof Exterior Elevations Two-dimensional, flat, orthographic representations of the building’s exterior Each elevation shows the final appearance of one side of the building Exterior Elevations Four exterior elevations are shown Elevations are drawn at the same scale as the floor plan Labeled as Front, Rear, Right, and Left Side Elevations Compass directions are often used to label elevations (North, South, East, West Elevations) Exterior Elevations Bungalow commonly, a one-story house with a low-pitched roof.
  • Cindy, the Below Additional Comments About the HIP Roof

    Cindy, the Below Additional Comments About the HIP Roof

    From: Mitch Martin To: Cindy Walden Subject: RE: New/Revised OIR-B1-1802, "Uniform Mitigation Verification Inspection Form,”(Rev. 05/11 ) Date: Monday, June 27, 2011 11:40:41 AM Importance: High Cindy, The below additional comments about the HIP Roof definition apply to your proposed revised 1802 Form and the proposed completely new definition for a HIP Roof, that may have some percentage of a Non- HIP Roof but still be considered a HIP Roof for an Insurance discount! This suggestion would only apply if you or the OIR insists on returning to the previous obsolete (and completely different) definition that was used prior to the current definition, which I consider a bad idea as it will only create much more confusion for Florida Home Owners who are trying to qualify for available discounts! The State and your Office must consider the impact, costs, and confusion that such a drastic and completely different HIP Roof definition will create both with Home Owners and Insurance Companies, who have spent much time and money having Professional Inspectors qualify their Home for the discount or Insurers having Insured Homes re-inspected to see if they can dis-qualify the Homes for the discount! The impact of completely changing the definition is huge, especially when the change is now back to a previous definition that was dropped supposedly for good reasons! The State and OIR need to stick with one definition, and if the definition is having problems being interpreted or enforced or applied fairly or equitably or definitively, the definition should be clarified and not completely changed! This is the case with the current HIP Roof definition, which should remain the same but with added clarifications to prevent misinterpretations or unintended wrong measurements! My additional suggestion, if the new HIP Roof definition (copied below) is somehow adopted follows: A.
  • Rolling Roof Trusses,” Pp

    Rolling Roof Trusses,” Pp

    Rolling 94 FINE HOMEBUILDING Roof Trusses Factory-made trusses save time and give you a roof engineered for strength and stability BY LARRY HAUN oof trusses offer many advantages. They are lightweight (generally made from kiln-dried 2x4s), so they Rare fairly easy to handle. Because trusses are engineered, they can span longer distances without having to rest on interior bearing walls, allowing for more flexibility in room size and layout. Finally, installing trusses on most houses is pretty simple. If you want to get a house weatherized quickly, roof trusses are the way to go. Ceiling joists and rafters are installed in one shot, and no tricky cuts or calculations are required. Lay out braces as well as plates Laying out the top plates for trusses is the same as for roof rafters. Whenever possible, I mark truss locations on the top plates before the framed walls are raised, which keeps me from having to do the layout from a ladder or scaffolding. For most roofs, the trusses are spaced 2 ft. on center (o.c.). I simply hook a IT’S EASY TO KEEP A STRAIGHT FASCIA Even if the walls aren’t perfectly straight, the trusses can be. To keep the eaves aligned and the fascias straight, you can take advantage of truss uniformity. Snap a chalk- line along an outside top plate (top photo). Align a mark on the truss with the chalkline when you set the truss (photos right). DECEMBER 2004/JANUARY 2005 95 UNLOADING AND SPREADING TRUSSES SET THE STAGE Erected to ease installation, a temporary catwalk is completed before the trusses arrive in bundles (photo below).