Span Tables

View details on fire resistance assemblies for one and two hour endurance.
* Because OPEN JOIST is a "stock" product, the length of an OPEN JOIST truss determines the size and grade of the truss' chords (see table below). Maximum spans published on the chart above may be limited by standard joist configuration. To find maximum clear span for a given truss depth in a given loading condition, refer to the bottom line of spans shown for that particular truss depth.
NOTE: Clear spans shown on this chart are presented under the following conditions: (1) Bearing size varies and is determined by loading conditions, truss span and truss spacing; (2) "Strongback" bracing is not considered; (3) Assumes composite action with a single layer of 3/4" wood sheathing glued and nailed or screwed; (4) Spans are clear distance between supports for uniformly loaded trusses and include allowable increases for repetitive use members.
Special Engineering Note: Open Joist trusses may be manufactured with components that provide increased structural values that may exceed the performance levels indicated in these charts.

OPEN JOIST is manufactured exclusively by Allegheny Structural Components, Inc.

3778 Oneida Valley Rd
Emlenton, PA 16373