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  • Home
  • Building Types
    • Pre Engineered Buildings
    • Express Steel Buildings
  • Roll Up Doors
    • Residential Roll Doors
    • Light Duty Commercial
    • Heavy Duty Commercial
    • Door Insulation
    • Door Windows
    • Door Seals
    • Electric Openers
  • Contact USSNA

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Pre-Engineered Steel Buildings

Steel frame structure of a building under construction on a clear day.

Building designs will meet local codes and loading

The buildings are for any type of application. Aviation, Agriculture to Commercial and Residential, send us your drawings and ideas and we can design and build to your needs.  

Illustration of a red steel roof truss frame structure.

Clear Span Double Slope

 Clear span gabled rigid frames with variable depth columns and rafters, with ridge at center line of frame.

Width 30' to 300' and over
Height 10' to 60' and over
Standard roof slope 1/2 : 12 to 6 : 12

Typical Uses:

Residential Garages & Workshops, Gymnasiums, Industrial, Clear Span Work Areas, Overhead Bridge Crane Conditions, Indoor Recreational Facilities, Tennis, Riding, Soccer, etc., Agricultural equipment or grain storage, Architectural applications

Simple brown wooden frame with an empty white center.

Clear Span Single Slope

 Clear span single slope rigid frame with uniform depth columns and uniform or variable depth rafters.

Width 15' to 120' and over
Height 8' to 60' and over
Standard roof slope 1/2 : 12 to 6 : 12

Typical Uses:

Shopping Centers, Convenience Stores, Free-standing Retail Units, Fire Stations, or where drainage is a particular concern. 

Simple steel frame structure with angled roof supports.

Multiple Span Double Slope

 Multi-span gabled rigid frame with variable depth columns and uniform or variable depth rafter sections supported by intermediate columns, with ridge at center line of frame.

Width 10' to 600' and over
Height 20' to 60' and over
Standard roof slope 1/2 : 12 to 2 : 12

Typical Uses:
Warehouses, Distribution Centers, Manufacturing, Industrial, or other facilities where high eave height or large square footage is required. 

Simple steel frame structure with angled roof supports.

Multiple Span Double Slope

 Multi-span gabled rigid frame with variable depth columns and uniform or variable depth rafter sections supported by intermediate columns, with ridge at center line of frame.

Width 10' to 600' and over
Height 20' to 60' and over
Standard roof slope 1/2 : 12 to 2 : 12

Typical Uses:
Warehouses, Distribution Centers, Manufacturing, Industrial, or other facilities where high eave height or large square footage is required. 

Multiple Span Single Slope

 Multi span single slope rigid frame with uniform depth columns and uniform or variable depth rafters.

Width 15' to 120' and over
Height 8' to 60' and over
Standard roof slope 1/2 : 12 to 6 : 12

Typical Uses:

Shopping Centers, Convenience Stores, Free-standing Retail Units, Fire Stations, or where drainage is a particular concern. 

Main Frames / Secondary Framing

Solid I-Beam construction for optimum strength

Building material used is minimum 50,000 p.s.i. yield strength (some manufacturers use 36,000 p.s.i. yield strength material, which is not as strong). By using a higher yield strength material, a smaller web can be utilized which means a space saving design.
Steel building frames are single bead; continuous arc welded by automatic welding machines (this helps ensure quality control). A factory primer coat is applied to help protect them during the building erection process. End Wall Frames and Columns are either cold formed, mill-rolled or built-up "I" sections depending on design requirements.  

Secondary Framing Girts & Purlins

 Secondary Framing Girts & Purlins are 8", 10", or 12" to meet design requirements.
Cold rolled Z-section, 13 to 16 ga. ASTM A-570, 55,000 p.s.i. yield material is used to provide maximum strength.  

Girt System

 Bypass girt system overlaps at sidewall columns forming a continuous "beam" for extra strength.  

Purlin System

Purlins are top-mounted on the rafter with a varied lap of 2' to 6' for strength and cost savings in erection labor. Maximum purlin spacing is 5' on center.  

Eave Strut

Eave Strut is a cold-formed C-Section that is rolled for the appropriate roof pitch, to help insure weather tightness at the eave.  

Base Condition

Sheeting angle is a continuous sheeting angle supplied for the attachment of the sheeting at the rake of the steel or metal building for ease of installation.
Base angle is a continuous angle, supplied for the attachment of the base of the sheeting to the concrete. It is attached to the concrete with ram-sets and/or equivalent anchors by others.

Base formed trim is an option also when a sheet notch is not available. It is included in the trim package when needed.

Base girt can be added also when the building has no floor and is added to support the base of the wall sheet.

Bracing Condition

Bracing diagonal rod or cable bracing may be supplied for roof and walls to remove longitudinal load from the structure.
Angle Flange Bracing is provided for the connection of the rigid frame to the purlins and girts. This ensures that allowable compression levels are adequate for any combination of loadings. Purlin bridging angles may be provided at each mid-bay to assure consistent purlin spacing and stiffening.

Portal framed are used in conditions when the bay requires open area, doors, windows or other building products that can not be blocked by diagonal bracing.

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