STEEL BUILDINGS GLOSSARY

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Secondary Framing
Members which carry loads to the primary framing. In metal buildings this term includes purlins, girts, eave struts, flange braces, etc.

Seismic Loads
Are horizontal loads acting in any direction a structural system due to action of any earthquake

Self Drilling Screws (SDS)
Fasteners, used for attaching panels and trims to girts and purlins, which drill their own holes and eliminate the pre-drilling operation.

Self Tapping Screws (STS)
Have the same function as SDS but need pre-drilled holes.

Sheeting
Profiled metal panels.

Shims
Small steel plates used for leveling base plates or for packing between structural members.

Sidewall
A term used to describe the entire composition of a building side which is parallel to the ridge.

Single Slope
Is a continuous frame building, which does not contain a ridge, but consists of one continuous slope from side to side. Building consists of straight or tapered columns and tapered or straight rafters. Sidewall girts may be continuous, by-passing the columns or simple span, flush in the column line. Building may or may not have interior columns.

Skylight
A translucent panel used at the roof to transmit natural light. It is usually made of fiberglass.

Sliding Door
A single or double leaf door which opens horizontally by means of overhead trolleys or bottom wheels.

Soffit
The underside covering of any exterior portion of the metal building such as canopies, sidewall and endwall roof extensions.

Span
Distance between the supports of beams, girders or trusses. In a pre-engineered building distance between interior columns.
Structural Steel Members
Load carrying members. May be hot rolled sections, cold-formed shapes, or built-up sections.

Strut
A brace fitted into a framework to resist force in the direction of its length.

Strut Purlin
An additional purlin, in braced bays, located close to the normal purlin at the intersection of roof brace rods or cables and the frame rafter, as required by design.

Tapered Members
A built up plate member consisting of flanges welded to a variable depth web.

Through-Fastened Roof System
A through-fastened roof system is one in which the roof panels are attached directly to the roof substructure with fasteners which penetrate through the roof sheets and into the substructure.

Tie
A structural member that is loaded in tension.

Trim
The light gage metal used in the finish of a building, especially around openings and at intersections of surfaces. Often referred to as flashing.

Truss
A structural member, made up of several individual parts welded or bolted together, designed to carry a tension or compression force with the complete structure acting as a beam.

Uniform Load
Load that covers all or part of a beam or surface where, throughout the portion covered, the intensity of load per unit of length or area is the same.

Uplift
Wind load on a building, which causes a load in the upward direction.

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