Primary FramingClearspan · Rigid Frame (RF) - Single Slope (SS) This tapered member frame is typically used in clearspan situations from 40 feet to 150 feet. It can be either gable or single slope. Common roof slopes of 1/4 to 4 in 12 are offered. When large clearspan areas are required for special industrial and commercial projects, the RF frame type is the economical choice. A single slope rigid frame is many times used on retail centers or as a creative way of adding to an existing structure. Both can be used with either cold-form purlins or open web joists.
Modular · Rigid Frame (RF-X) - Single Slope (SS-X) The solid web rigid frame with interior columns provides multiple spans on wider buildings. It can be either gable or single slope. This frame type is economical with individual spans of 40 feet to 80 feet and building widths from 80 feet to 300 feet plus. Roof slopes are 1/4 to 1 in 12. The letter "X" designates the number of interior columns used. The RF-X can be used with either cold-form purlins or open web joists.
Lean-to (LT) The lean-to frame joins to and is supported by a main building frame. Common spans are 20 feet to 60 feet. The lean-to differs from the single slope in that it must be supported on the high side by an adjoining building column.
Tapered Beam (TB) This straight column rigid frame is designed for maximum efficiency of interior space. It is suitable for all types of small buildings that require clearspans from 20 feet to 60 feet. Rood slopes of 1/4 to 1 in 12 are available. The TB is ideal for partitioning interior bays and small crane support systems.
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