1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULUL 1298ISBN 0-7629-1251-0Roof Trusses for ManufacturedHomesUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULUL COPYRIGHTED MATERIAL NOT AUT
2、HORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULUnderwriters Laboratories Inc. (UL)333 Pfingsten RoadNorthbrook, IL 60062-2096UL Standard for Safety for Roof Trusses for Manufactured Homes, UL 1298Fifth Edition, Dated December 21, 2006Summary of TopicsThis new edition of UL
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19、now in effect, except for those paragraphs, sections, tables, figures,and/or other elements of the Standard having future effective dates as indicated in the note following theaffected item. The prior text for requirements that have been revised and that have a future effective dateare located after
20、 the Standard, and are preceded by a SUPERSEDED REQUIREMENTS notice.New product submittals made prior to a specified future effective date will be judged under all of therequirements in this Standard including those requirements with a specified future effective date, unlessthe applicant specificall
21、y requests that the product be judged under the current requirements. However, ifthe applicant elects this option, it should be noted that compliance with all the requirements in thisStandard will be required as a condition of continued Listing and Follow-Up Services after the effectivedate, and und
22、erstanding of this should be signified in writing.Copyright 2006 Underwriters Laboratories Inc.This Standard consists of pages dated as shown in the following checklist:Page Date1-6 December 21, 2006DECEMBER 21, 2006 UL 1298tr2UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIB
23、UTION WITHOUT PERMISSION FROM ULDECEMBER 21, 20061UL 1298Standard for Roof Trusses for Manufactured HomesThe First and Second editions were titled Roof Trusses for Mobile Homes.First Edition June, 1975Second Edition April, 1979Third Edition March, 1990Fourth Edition March, 1995Fifth EditionDecember
24、21, 2006An effective date included as a note immediately following certain requirementsis one established by Underwriters Laboratories Inc.Revisions of this Standard will be made by issuing revised or additional pagesbearing their date of issue. A UL Standard is current only if it incorporates themo
25、st recently adopted revisions, all of which are itemized on the transmittal noticethat accompanies the latest set of revised requirements. Comments or proposalsfor revisions on any part of the Standard may be submitted to UL at any time.Proposals should be submitted via a Proposal Request in ULs On-
26、LineCollaborative Standards Development System (CSDS) at http:/.ISBN 0-7629-1251-0COPYRIGHT 2006 UNDERWRITERS LABORATORIES INC.UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULDECEMBER 21, 2006ROOF TRUSSES FOR MANUFACTURED HOMES - UL 12982No Te
27、xt on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULCONTENTSINTRODUCTION1 Scope .42 General 43 Glossary .5PERFORMANCE4 General 5MARKING5 General 5DECEMBER 21, 2006 ROOF TRUSSES FOR MANUFACTURED HOMES - UL 1298 3UL COPYRIGHTED MATERI
28、AL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULINTRODUCTION1 Scope1.1 These requirements cover roof trusses whose structural properties cannot be determined by standardengineering calculations. The trusses are intended for installation in manufactured homes.1.2 A
29、 product that contains features, characteristics, components, materials, or systems new or differentfrom those covered by the requirements in this standard, and that involves a risk of fire, electric shock, orinjury to persons shall be evaluated using the appropriate additional component and end-pro
30、ductrequirements as determined necessary to maintain the acceptable level of safety as originally anticipatedby the intent of this standard. A product whose features, characteristics, components, materials, orsystems conflict with specific requirements or provisions of this standard cannot be judged
31、 to comply withthis standard. Where considered appropriate, revision of requirements shall be proposed and adopted inconformance with the methods employed for development, revision, and implementation of this standard.2 General2.1 Except as indicated in 2.2, a component of a product covered by this
32、standard shall comply with therequirements for that component.2.2 A component need not comply with a specific requirement that:a) Involves a feature or characteristic not needed in the application of the component in theproduct covered by this standard, orb) Is superseded by a requirement in this st
33、andard.2.3 A component shall be used in accordance with its recognized rating established for the intendedconditions of use.2.4 Specific components are recognized as being incomplete in construction features or restricted inperformance capabilities. Such components are intended for use only under li
34、mited conditions, such ascertain temperatures not exceeding specified limits and shall be used only under those specific conditionsfor which they have been recognized.DECEMBER 21, 2006ROOF TRUSSES FOR MANUFACTURED HOMES - UL 12984UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDIST
35、RIBUTION WITHOUT PERMISSION FROM UL3 Glossary3.1 For the purpose of this Standard, the following definitions apply.3.2 BEARING SURFACE That area of the truss that rests on the bearing walls or other acceptablesupports.3.3 CLEAR SPAN The unsupported distance between the truss bearing surfaces.3.4 DEA
36、D LOAD The weight of all permanent construction and fixed service equipment, including theweight of the truss.3.5 LIVE LOAD The weight superimposed by the use and occupancy of the manufactured home,including wind and snow load.PERFORMANCE4 General4.1 The performance of a truss or rafter shall be det
37、ermined in accordance with Section 280.402 of theDepartment of Housing and Urban Development Manufactured Home Construction and Safety Standardsas published in the November 18, 1975 Federal Register, Volume 40, No. 244, page 58764, and anysubsequent amendments thereto.MARKING5 General5.1 Each roof t
38、russ or bundle of trusses produced by a truss manufacturer and intended for shipment toa manufactured home manufacturers plant shall be marked with the truss manufacturers or privatelabelers name or identifying symbol.5.2 Each roof truss or bundle of trusses shall be marked to indicate the maximum d
39、esign dead load, themaximum or actual clear span, the minimum bearing surface or other method of support, the maximumdesign roof live load, and the on-center spacing.5.3 All markings shall be securely fixed by means of adhesives, shellac, staples, or acceptablecombinations thereof.5.4 Roof trusses s
40、ecured in bundles shall have marking information attached so as to be readily visible.5.5 If a manufacturer produces roof trusses at more than one factory, each truss or bundle of trussesshall have a distinctive marking to identify it as the product of a particular factory.DECEMBER 21, 2006 ROOF TRUSSES FOR MANUFACTURED HOMES - UL 1298 5UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULDECEMBER 21, 2006ROOF TRUSSES FOR MANUFACTURED HOMES - UL 12986No Text on This Page
