Typical Roof Truss Design

    Typical Roof Truss Design

    A - Design Loading

    Top and bottom chord dead and live loads (including snow load) in pounds per square foot as used in the analysis.

    B - Load Duration Factor

    An adjustment of allowable design values of lumber and fasteners for load durations other than normal.

    C - Lumber Specifications

    Lumber size, species and grade for each member as used in the analysis.

    D - Reaction

    The force in pounds on the bearings produced by the truss at design load, and the bearing width.

    E - Connector Plates

    The gage, series, size and orientation.

    F - Engineers Seal

    Seal of the registered professional supervising the design.

    G - Slope

    The vertical rise in inches for every 12 inches of horizontal run.

    H - Panel Points

    The joints of the truss where the webs intersect the chords.

    I - Peak

    The intersection of two chords where the slope changes from positive to negative. Generally at the centerline of the truss.

    J1 & J2 - Splices

    Where two chord pieces join together to form a single member. J1 shows the location, J2 the corresponding connector plate.

    K - Heel

    The point of the truss where the top and bottom chord intersect, generally at the bearing point.

    L - Span

    The nominal span based on out-to-out dimensions of the supports or the bottom chord length, whichever is greater.

    M - General Notes

    Notes that apply to all Alpine design drawings.

    N - Special Notes

    Notes that apply only to this specific design drawing.

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