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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