Understand your Steel Building

Get familiar with the basic terminology for your metal building

  • 1. Eave Strut
  • 2. Frame Rafter
  • 3. Ridge Cap
  • 4. Gable Trim
  • 5. Corner Column
  • 6. Endwall Girt
  • 7. Endwall Rafter
  • 8. Endwall Columns
  • 9. Corner Trim


  • 10. Sidewall Girt
  • 11. Frame Column
  • 12. Purlins
  • 13. Eave Trim
  • 14. Framed Opening Jamb
  • 15. Jamb Trim
  • 16. Framed Opening Header
  • 17. Door Head Trim
  • 18. Roof Slope

Most metal buildings have four outside walls. Two of these walls are called sidewalls. This occurs where the roof meets the walls and aligns parallel to the flush floor without any increase in the height of the walls. The other two walls, called end walls, show a rising line where the walls meet the roof and the height of the walls change.

The point where the sidewalls meet the roof is called the eave. It often has special trim to dress it up or a gutter to catch the rain flow from the roof. The distance from the bottom of the base plate to the point where the roof and sidewall intersect is where the eave height is determined.

Dalal metal buildings have three basic dimensions: span (width), length, and eave height. The span is the distance from the outside of the sidewall girt on one side to the outside of the sidewall girt on the other side. The length is the distance from the outside of the end wall girt on one end wall to the outside of the end wall girt on the other end wall. Eave height is the distance from the bottom of the base plate to the top of the eave strut





Once they are erected, metal buildings can look quite different. There are, however, a number of standard parts and configurations that are common to all. This section concerns itself with standard types of materials, parts, and systems to show how they function to make up the entire building.

All metal buildings are built on top of a foundation. The  foundation  is generally a concrete slab with concrete footings. The footing is concrete, usually rectangular shaped, poured and formed under a column. A footing distributes the load created by the metal building support member into the supporting soil. Anchor bolts are set in the footing to “anchor” the column or structural members.

A metal  base plate  is a pre-punched metal plate which comes already welded to the base of the column or structural member. The pre-punched plate fits over the anchor bolts.

If you were to take off the outside covering on the roof and walls of a metal building, you would see something similar to the illustration shown here. This is known as the structural support system, and is divided into the primary support system and the secondary support system.

Primary support systems furnish the main support of the building. The primary structural support system is more often called the main framing system and can be divided in two basic types – clear span and beam and column. Clear span frames have no interior obstructions between the exterior columns. Beam and column or BC frames have one or more interior columns between the exterior columns, supporting some of the vertical load carried by.

Secondary support systems
  furnish the secondary support of the building. The secondary support consists of purlins, girts, eave struts and bracing members. They distribute the load fro the panel area to the primary member s and horizontal loads such as wind ad seismic.

Get to know more metal building terminology,                          by checking out our glossary

The  envelope  of a steel building is usually covered by insulated sandwich panels of single skin steel sheets, unless otherwise requested.

A superior pre-painted color finish that remains beautifully tough for years and years, panels are available in a range of contemporary colors. These panels and color trim can be combined to provide a contrasting or complementing finish that is architecturally attractive. Color of choice may be requested at the time of order.  






Our panels are usually made of Galvalume.  Galvalume   panels are formed of steel sheets that have a coating that is about 55 percent aluminum and 45 percent zinc by volume. The result is a steel sheet that is highly corrosive resistant. Galvalume offers the building owner the best features of both aluminum and zinc: the durability and long life of aluminum coatings; and the galvanic protection of zinc coatings.