OptiKits! Pole Barn Trusses

Our pole barn trusses are an important and critical component in our pole barn kits. Each are designed based upon the utilization of the building. OptiKits! are ideal for garage, farm building, and storage applications. As your needs change so do the components in your building package.

Pole Barn With Porch
We try to minimize cutting on structural members so our designs with porch and lean-to applications include raised heels for rafter nailing. The heel height is changed to accommodate the size of the rafter. This is illustrated below using a 2×10 rafter application. As you can see a standard 40′ truss heel is 6 3/16″ and the raised heel is 9 12/16″.

pole barn trusses

Residential / Agricultural

Category
Category I Uninhabited like a farm building or garage.
Category II Inhabited as in some workshop applications and attic trusses.
Category III trusses are for public assembly, churches.

Exposure
Exposure B Some protection from the wind via trees or other buildings.
Exposure C No protection from the wind whatsoever.

Thermal
Ct 1.2 Unheated
This rating means the truss will be built without any adjustments due to part or full time heating of the building.
Ct 1.1 Part time heated
Ct 1.0 Heated building

Duration Factor
Member stress factors are adjusted by load duration, or how long the condition will exist.
1.15 Typical
1.00 Load duration is not factored in

O.C. Spacing
On center spacing for manufactured truss.

Design Spec
The building code used in the locality of the truss destination.

TC Live
Top chord live load in psf. Snow,ice, wind

TC Dead
Top chord dead load in psf. Roofing materials

BC Live
Bottom chord live load in psf. Attics

BC Dead
Bottom chord dead load in psf. Ceiling

Pg
Ground snow load truss is designed using.

Purlins & Lateral Bracing
Purlins are 2×4’s that nail to the top chord of the trusses at a typical 24″ on center.
Lateral bracing is accomplished the same way on the bottom chord of the truss at a different on center. That spacing will be on your truss drawing.

Your truss drawings will also have the building length and wall height on them so that the software that generates the truss design can factor in those parameters.