Duro Span Steel Building Technical Specifications

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Duro Quick Specs

• Heavy-duty GALVALUME®+ AZ180 (AZ60)
• All necessary hardware included
• No interior frames for 100% clear span space
• Easy foundation set-up
• Features 60% aluminum and 40% zinc alloy
• Much more rust resistant than traditional galvanized steel
• Energy effecient and high heat reflectivity
• Perfect for use in every climate

Additional Details and Specifications

1.0 Scope - This section covers the design, material, fabrication, shipment and erection of arch-based building systems. All material, erection and field work included and excluded shall be in accordance with the "Code of Standard Practice" of the building construction industry.

2.0 Description - All the various models of buildings listed below utilize the basic bolted arch panel concept to form spans of various shapes. The pre-punched panel bolted construction can be utilized for permanent structures or be easily dismantled for reassembly with virtually no damage to the members. This portability is an added feature not normally encountered in the pre-engineered building field.

2.1 Building Size - Building sizes range from 10' wide spans in our Mini models up to unlimited widths in our "multi-span" arch systems. Lengths are unlimited, based on 18" increments for the Mini building and 2' 6" for all other models. Peak heights and sidewall clearances vary for different model types and cover a wide range of combinations.

2.2 Building Type - (a) Arch Models: A single radius clear span arch structure. Standard sizes range from 19' wide to 100' wide with height being limited to 1/2 span or less. (b) Open Sided: A single radius, partial arch structure, clear span with structural frame supports on open side. Standard sizes range from 19' wide to 50' wide with open side clearances of 8', 10', 12', 14', 16' and varying bay spacing. (c) S Series: A straight sided, multiple radius clear span arch system. Standard sizes range from 20' wide to 60' wide, with straight sides and varying center heights. (d) G Series: A straight roof, straight-sided clear span building system with a uniform roof slope of 18 degrees. Standard sizes range from 20' wide to 40' wide with varying center heights. (e) A Series: A straight roof, with a uniform roof slope of 18 degrees, straight side panels angled at base. Standard sizes range from 20' wide to 50' wide with varying center heights. (f) Roof Systems: A single radius clear span low profile arch structure designed to act as a roof system utilizing conventional wall designs as sidewall support. Standard sizes range from 30' wide to 90' wide with heights in the 10' to 30' region. (g) Multiple Arch Spans: A series of single radius arch structures sharing a common structural support system as an interior wall. Standard sizes range from 30' to 70' wide for each individual span, joined side by side in any number of combinations from double span to triple span and upward. (h) Conveyor Covers: Either single radius or multiple radius clear span arch structures designed to cover standard single or double conveyors and acting as a gallery. Standard sizes range from 10' wide to 30' wide with heights and sidewall clearances to accommodate any combination of conveyor and walkway systems. (i) Mini Buildings (Security Shelters): Single radius clear span arch structure with straight sides. Designed to provide tamper proof, secure cover for remote storage locations such as well-head valves, oil field storage, etc. Standard sizes range from 10' wide to 20' wide with various peak heights to suit different applications.

2.3 Arch Structures - All arch structures, other than Mini Buildings, utilize our standard 2' 6" W X 10' L corrugated pre-punched panels as the basis of the design. Panels are cold formed to various radii as required and bolted together to achieve the desired span. Panels are gang punched to ensure uniformity of manufacture and ease of assembly.

2.4 Endwall Systems - All endwalls are designed using our standard 18" center 3 1/4" deep corrugated, pre-punched panels to form various end wall arrangements as required. By altering the pattern of panels, any size opening can be achieved to accommodate roll-up, overhead, swing or sliding door systems.

2.5 Building Loading: -General Basic design loads shall include live, snow, wind and earthquake (if applicable) in addition to dead load. All loading shall be in accordance with the governing building code as prescribed by local building authorities. Snow and Wind Load Design snow and wind load shall be based on the specified ground snow load and wind pressure respectively. Distribution of loading over the building envelope shall be in accordance with the applicable governing building codes for the location involved. Seismic Loads If applicable, the effect of dynamic loads must be considered in combination with other loads.

3.0 Design and Plans - Plans and Specifications The manufacturer shall submit plans and specifications in sufficient detail to establish the design of the structure under consideration, including but not necessarily limited to, all loading conditions, material grades and geometry of the panel section. Design Certification upon request, the manufacturer shall furnish a letter of design certification signed and sealed by a registered professional engineer.

4.0 Materials - Materials shall be new and shall meet or exceed the mechanical and physical properties required by the design and the fabrication process.

4.2 Fabrication - Fabrication tolerances shall not exceed those recommended by the governing building codes.

5.0 Arch Systems Materials - Basic arch panel structures are available in the following material: Super Galvalume Plus – 24Ga. to .16Ga. AZ60/180 Galvalume Plus steel (Heavy Commercial Coating with 40 Year Warranty) passivated with regular mill finish. The Duro Span building manufactured from AZ180 Galvalume steel sheet will not perforate within a period of 40 years after shipment from the factory due to exposure to normal atmospheric corrosion. 
We will replace any component that does not conform but is not liable for cost of labor or consequential damages due to such non conforming. Notice of such defects must be given in writing to the company immediately upon their discovery.

5.1 Fasteners - Fastener location and spacing shall be in accordance with manufacturer's standards for the roof (arch) and wall panels. Basic structural fasteners are as follows: Indented Hex Washer Head Machine Screws, Organic Coating, Assembled with Neoprene Washers 5/16 - 18 tpi X 3/4" | 5/16 - 18 tpi X 1" | Square Machine Screw Nuts, Organic Coating | 5/16 - 18 tpi

5.2 Sealant - Manufacturer shall provide, when requested, quality metal building tape sealant for all roof seams and joints. Sealant is a butyl rubber compound used to seal panels against air, dirt, ice and water. Material is compatible with most plastics, foams, rubber and other metal building components.

5.3 Trim and Flashing - Special manufactured standard double angle flashing system is utilized at all end wall to roof transitions. Flashing is made from heavy gauge steel to provide some structural stability as well as finishing features.

6.0 Accessories - Manufacturer provides a complete array of standard accessory items available for all structure types.

6.1 Swing Doors - Construction - Pre-hung 4' X 7' panel assembled door suitable for padlock type closure.

6.2 Sliding Doors - Top-hung heavy-duty panel construction, with 14 gauge framing and 22 gauge corrugated door panels. Doors are equipped with pull handles, heavy-duty ball bearing rollers, interlocking edge, bottom seals, latch and lock device.

6.3 Hangar Doors - Manufacturer has a full range of standard double track top hung sliding hangar doors. Construction is as standard doors, and leafs are on a double track system to allow for partial opening. Sizes range from 30' to 80' in width – in heights of 10'-0" to 20'-0".

6.4 Sectional Overhead Doors and Roll Up Doors - Framed openings shall be all steel heavy-duty bolted construction. Type of door, hardware required and glazing shall be furnished, installed and painted by others.

6.5 Skylights and Wall Lights - Manufacturer has a wide variety of fiberglass panels formed to the shape of the basic building components. Material is a quality 12 oz., 16 oz., or 24 oz. fiberglass panel designed to install as a replacement for standard steel sections for ease of erection.

6.6 Ventilators - Continuous circular gravity type 12" diameter ventilator or 12" diameter turbine ventilators utilizing heavy duty ball bearing type shafts for quiet long lasting service.

6.7 Roof and Wall Insulation - Arch type structures are compatible with all conventional insulation methods – spray on, fiberglass rolls or rigid foam.

7.0 Warranties: - Manufacturer's Warranty shall warrant the following: 1) All buildings are designed in accordance with the local governing building code to withstand the published wind and snow loadings when provided by the seller to the manufacturer. 2) All materials will be free of defect in material and workmanship.

8.0 Shipping - All arch structures have unique compact stacking capability due to the nesting of the standard panel components. This stacking feature greatly reduces the bulk found in normal building construction and reduces freight costs.

9.0 Erection - The manufacturer supplies detailed comprehensive erection guides for all building models. Blueprints availabe for a nominal fee. These erection guides contain valuable information to minimize construction problems and speed up installation.

Why Build With Steel?

100% Usable Space
Clear span trussless steel building design ensures that building interiors can easily accept conventional insulation, electrical wiring heating and air conditioning ducts, plumbing systems, drywall, false ceilings and partitions.
Duro Span steel buildings feature clear span construction, which eliminates space robbing trusses and posts. This ensures maximum usable space, which means lower cost.
Clear span trussless steel building design ensures that your steel building interior can easily accept conventional insulation, electrical wiring heating and air conditioning ducts, plumbing systems, drywall, false ceilings and partitions.

Steel Buildings are Durable
Duro Span steel buildings outlast most all other structures, and longer life means lower cost. Duro buildings are constructed of AZ180 Galvalume Plus™steel, which offers a 30-year factory warranty against corrosion, and materials will not deteriorate or require replacement.
Duro Span provides world-class engineering and support. All Duro steel buildings are designed and tested to the highest standards of quality by factory-employed engineers, and complete engineering drawings are available upon request.
Steel Buildings are Maintenance Free
Duro buildings are virtually maintenance free. Each structure is manufactured using AZ180 Galvalume Plus®steel, which offers a 30-year factory warranty against corrosion.
This all-steel construction eliminates maintenance associated with rot and warping, and the fine spangle and soft metallic sheen eliminates the need for painting.

Assembly Information

More than 75% of Duro customers erect their buildings themselves. Construction of a Duro building requires only four people. Construction can be done with fewer or more people, but four people can get the job done, depending on the size of the building, in a matter of days.

1. Raise the arches into place. In most cases no heavy equipment is necessary when raising your arches.

2. All the arches are finally up. If you purchased an open ended building, you are done.  

3.  Open Ended Building - All arches completed.

Option 1: Install the end walls. Our pre-cut, pre-drilled end walls are easy to install with features like weather strip inserts and heavy-duty trim kits that guarantee a lifetime custom fit. The last nine inches of each end panel is flat so the two panels fit tight when bolted together making it easy to assemble. The bolts sit on the flat surface, not a corrugated one giving a tight seal with no leaks.

4. Install the end walls.

5. Install the doors.

6. Building with end walls completed.

Building your own end wall is an easy task for any do-it-yourselfer. Beautiful end walls can be customized to your own specifications, requirements and personal tastes.


You can buy your next steel building with confidence. Duro Span is is proud to adhere to industry standards of excellence and quality assurance.
• All buildings are designed in accordance with the governing building code to withstand the published wind, snow and seismic conditions.

• All buildings are certified under CSA-A660 Quality Certification for Steel Building Systems.

• Welding Bureau certified to CSA Standard 47.1 for fusion welding of steel.

Steel Buildings Offer Fire Protection

Steel buildings are fabricated from non-combustible materials making them virtually fire-proof. But it's not just the fire protection that offers peace-of-mind. The vast majority of insurance companies offer significant savings on premiums for steel buildings. It only makes sense - the risk is less, and so are your insurance premiums. Steel buildings offer what traditional construction cannot offer - true peace of mind from the threat of fire!

Get Your Free Duro Span Steel Building Quote!

*Prices Do Not Include Shipping