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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