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Component Solutions™ Important Information & General Notes
<br />General Notes
<br />1. Each Truss Design Drawing (TDD) provided with this sheet has been
<br /> prepared in conformance with ANSI/TPI 1. Refer to ANSI/TPI 1 Chapter 2 for the
<br /> responsibilities of all parties involved, which include but are not limited to the
<br /> responsibilities listed on this sheet, and for the definitions of all capitalized
<br /> terms referenced in this document.
<br />2. TDDs should not be assumed to be to scale.
<br />3. The Contractor and Building Designer shall review and approve the
<br /> Truss Submittal Package.
<br />4. The suitability and use of the component depicted on the TDD for any
<br /> particular building design is the responsibility of the Building Designer.
<br />5. The Building Designer is responsible for the anchorage of the truss at all
<br /> bearing locations as required to resist uplift, gravity and lateral loads, and for all
<br /> Truss-to-Structural Element connections except Truss-to-Truss connections.
<br />6. The Building Designer shall ensure that the supporting structure can
<br /> accommodate the vertical and/or horizontal truss deflections.
<br />7. Unless specifically stated otherwise, each Design assumes trusses will
<br /> be adequately protected from the environment and will not be used in
<br /> corrosive environments unless protected using an approved method. This
<br /> includes not being used in locations where the sustained temperature is
<br /> greater than 150°F.
<br />8. Trusses are designed to carry loads within their plane. Any out-of-
<br /> plane loads must be resisted by the Permanent Building Stability Bracing.
<br />9. Design dead loads must account for all materials, including self-weight.
<br /> The TDD notes will indicate the min. pitch above which the dead loads are
<br /> automatically increased for pitch effects.
<br />10. Trusses installed with roof slopes less than 0.25/12 may experience
<br /> (but are not designed for) ponding. The Building Designer must ensure that
<br /> adequate drainage is provided to prevent ponding.
<br />11. Camber is a non-structural consideration and is the responsibility of truss
<br /> fabricator.
<br />Handling, Installing, Restraint & Bracing
<br />1. The Contractor is responsible for the proper handling, erection, restraint
<br /> and bracing of the Trusses. In lieu of job-specific details, refer to BCSI.
<br />2. ANSI/TPI 1 stipulates that for trusses spanning 60' or greater, the
<br /> Owner shall contract with any Registered Design Professional for the design
<br /> and inspection of the temporary and permanent truss restraint and bracing.
<br /> Simpson Strong-Tie is not responsible for providing these services.
<br />3. Trusses require permanent lateral restraint to be applied to chords and
<br /> certain web members (when indicated) at the locations or intervals indicated on
<br /> the TDD. Web restraints are to be located at mid points, or third points of the
<br /> member and chord purlins are not to exceed the spacing specified by the TDD.
<br /> Chords shown without bracing indicated are assumed to be continuously
<br /> braced by sheathing or drywall. Permanent lateral restraint shall be
<br /> accomplished in accordance with: standard industry lateral restraint/bracing
<br /> details in BCSI-B3 or BCSI-B7, supplemental bracing details referenced on the
<br /> TDD, or as specified in a project-specific truss permanent bracing plan provided
<br /> by the Building Designer.
<br />4. Additional building stability permanent bracing shall be installed as
<br /> specified in the Construction Documents.
<br />5. Special end wall bracing design considerations may be required if a flat
<br /> gable end frame is used with adjacent trusses that have sloped bottom
<br /> chords (see BCSI-B3).
<br />6. Do not cut, drill, trim, or otherwise alter truss members or plates without
<br /> prior written approval of an engineer, unless specifically noted on the TDD.
<br />7. Piggyback assemblies shall be braced as per BCSI-B3 unless otherwise
<br /> specified in the Construction Documents.
<br />8. For floor trusses, when specified, Strongbacking shall be installed per
<br /> BCSI-B7 unless otherwise specified in the Construction Documents.
<br />9. For IBC 2021 and newer, truss chords without a diaphragm require a project
<br />specific bracing design prepared by a registered design professional.
<br /> Symbols and Nomenclature
<br />5x7 Plate size; the first digit is the plate width (perp. to the slots)
<br />and the second digit is the plate length (parallel to the slots).
<br />5x7-18 -18, -18S5, or -18S6 following the plate size indicates different
<br />18 gauge plate types.
<br />These symbols following the plate size indicate the direction of
<br />the plate length (and tooth slots) for square and nearly square
<br />plates.
<br />10-3-14 Dimensions are shown in feet-inches-sixteenths (for this
<br />example, the dimension is 10'-3 14/16").
<br />Joints are numbered left to right, first along the top chord and
<br />then along the bottom chord. Mid-panel splice joint numbers
<br />are not shown on the drawing. Members are identified using
<br />their end joint numbers (e.g., TC 2-3).
<br />When this symbol is shown, permanent lateral restraint is
<br />required. Lateral restraint may be applied to either edge of the
<br />member. See Note 3 under Handling, Installing, Restraint &
<br />Bracing for more information.
<br />Bearing supports (wall, beam, etc.), locations at which the
<br />truss is required to have full bearing. Minimum required
<br />bearing width for the given reactions are reported on the TDD.
<br />Required bearing widths are based on the truss material and
<br />indicated PSI of the support material. The Building Designer is
<br />responsible for verifying that the capacity of the support
<br />material exceeds the indicated PSI, and for all other bearing
<br />design considerations.
<br />Truss-to-Truss or Truss-to-Structural Element connection,
<br />which require a hanger or other structural connection (e.g.,
<br />toe-nail) that has adequate capacity to resist the maximum
<br />reactions specified in the Reaction Summary. Structural
<br />connection type is not limited by type shown on TDD. Toe-
<br />nails may be used where hanger type shown where allowed by
<br />detail or other connection design information. Design of the
<br />Structural Element and the connection of the Truss to a
<br />Structural Element is by others.
<br /> Note: These symbols are for graphical interpretation only; they are not
<br /> intended to give any indication of the geometry requirements of the
<br /> actual item that is represented.
<br /> Materials and Fabrication
<br /> 1. Design assumes truss is manufactured in accordance with the
<br /> TDD and the quality criteria in ANSI/TPI 1 Chapter 3, unless more
<br /> restrictive criteria are part of the contract specifications.
<br /> 2. Unless specifically stated, lumber shall not exceed 19%
<br /> moisture content at time of fabrication or in service.
<br /> 3. Design is not applicable for use with fire retardant, preservative
<br /> treated or green lumber unless specifically stated on the TDD.
<br /> 4. Plate type, size, orientation and location indicated are based on
<br /> the specified design parameters. Larger plate sizes may be
<br /> substituted in accordance with ANSI/TPI, Section 3.6.3. Plates shall
<br /> be embedded within ANSI/TPI 1 tolerances on both faces of the truss
<br /> at each joint, unless noted otherwise.
<br /> 5. Truss plates shall be centered on the joint unless otherwise
<br /> specified.
<br />Referenced Standards
<br />ANSI/TPI 1: National Design Standard for Metal Plate Connected Wood
<br />Truss Construction, a Truss Plate Institute publication (www.tpinst.org).
<br />BCSI: Guide to Good Practice for Handling, Installing, Restraining &
<br />Bracing Metal Plate Connected Wood Trusses, a joint publication of the
<br />Truss Plate Institute (www.tpinst.org ) and the Structural Building
<br />Components Association (www.sbcindustry.com ).
<br />DSB-89 Recommended Design Specification for Temporary Bracing of
<br />Metal Plate Connected Wood Trusses, a Truss Plate Institute publication
<br />(www.tpinst.org ).
<br />NDS: National Design Specification for Wood Construction published by
<br />American Forest & Paper Association and American Wood Council.
<br />ESR-2762 Simpson Strong-Tie® AS Truss Plates are covered under
<br />ESR-2762 published by the International Code Council Evaluation Service
<br />(www.icc-es.org ).
<br /> TD-GEN-0003A 5/2019
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