Arch steel building features, design & specifications

Galvalume® Steel Construction

Curvco Steel Structures are truly US Buildings as they are manufactured in the U.S. using 100% Galvalume, the finest quality commercial steel made in the US.

Galvalume is a coating on the steel substrate that is applied at the steel mill. This coating is a mixture of some of the most durable metals including Aluminum (55%), Zinc (43%), and Silicon (2%). The advantage of Galvalume is the aluminum’s ability to create a highly corrosion-resistant oxide film combined with the sacrificial action of zinc. The end result is a coating that provides excellent corrosion resistance on the sheet (steel panel) while still providing cutting-edge corrosion protection.

This unique coating forms an almost impervious (impenetrable) shield over the steel; in laboratory testing, it has 7 times the resistance to rust as galvanized. It is extremely effective, especially in regions subjected to corrosive environments or acid rain. For this reason Curvco offers a 40-year non-prorated warranty against rust perforation.

Why Steel?

Steel is a vital part of our everyday lives from the cars we drive, the trains we ride, the appliances that make our lives easier and much more. Steel is durable and the most recycled material on earth. The steel industry has invested in the latest technologies to make steel more innovative, lower in cost to you and stronger than ever. Here are just some of the benefits of building with steel

  • Strong and Lightweight – Significantly stronger than wood, needs no maintenance, easy to work with, and more economical.
  • Durable – Won’t crack, chip, warp or sag. Can be engineered to better withstand hurricanes and earthquakes.
  • Non-combustible – Fire resistant material.
  • Versatility – Can be custom formed and cut to create high endwalls and large open spaces while maintaining its durability.
  • Better for the Environment – Saves trees, is not treated with pesticides or other chemicals and does not encourage mold to form.
  • Sustainable Building Material – meets criteria for “GREEN” building LEED requirements


Curvco steel hardware consists of a one-size nut-and-bolt for the entire building! The bolt features a super resilient JS-1000 clearcoat coating. In a military Kesternich saltwater cabinet test, this bolt withstood over 1000 hours without showing any surface rust! (A standard hardware bolt only lasts 70-90 hours.) The United States Army Corps of Engineers has certified this bolt as superior in applications for the US Armed Forces. Just another way Curvco can save you time and money while providing the highest quality product!


Prefabricated For Simple, Strong, Tight Assembly

quonset building

All the steel building arch and end-wall panels are pre-formed and pre-drilled for easy installation and assembly. No field welding is necessary. Since the lip and the last 9 inches at the end of each arch panel are flat, the arch sections bolt together super-tight, as the bolts only rest on flat-to-flat steel.

When the arch building panels are bolted together and overlap from panel to panel, and, at each lip every 2’ down the length it doubles the steel thickness. This overlapping or “doubling” of the thickness simulates having a steel beam every 2’ down the length and similarly simulates having a steel reinforcing plate wherever the panels bolt together. This redundant engineered design combined with the deep corrugation and heavy gauge of the steel makes the Curvco Steel Building an incredibly strong pre-engineered metal building.

Curvco arch buildings have been pre-engineered and designed to meet your local wind, snow, and seismic conditions. Since Curvco’s buildings are based on an arch configuration with a deep corrugation using heavy-gauge steel, it enables them to withstand hurricane-force winds, the heaviest snow loads, and even tremendous seismic activity. They have been laboratory tested against hurricane-force winds and approved for use by the state of Florida (FL 13036.1), (FL 11815.1).


Engineered Design

Curvco Steel Buildings’ standard models can usually accommodate virtually any application. In cases where a customer has a unique application, our engineers will modify existing models or custom design a building solution. Using CAD (computer-aided design) software they can easily tailor the product to accommodate often difficult criteria all at a significantly lower cost than conventional construction. It is because of this ability and attention to customers’ needs that Curvco has cultivated years of repeat business from many Fortune 500 companies and Government agencies. Here are just some of the custom or special uses Curvco can design arch buildings:

  • crane liftable buildings
  • covering conveyor systems
  • mounting to a barge or ship deck
  • mobile cover- -attaching to rails that can be rolled on a track into place
  • Roof Kits for Shipping Containers– -attaching to shipping containers


We offer a selection of very useful accessories to customize and improve the functionality of your building. These include personnel doors, skylights, vents, exhaust fans, energy star fiberglass insulation systems for Quonset steel buildings. Please visit this informational page to learn more about these accessories and their benefits.



Curvco Steel Structures Standard Building Features

Other Buildings

From 10’ – 140’ wide, custom design applications availableLimited to only 70’ wide, no custom design engineering
40 Year Warranty on color coatings by Akzo Nobel and manufacturerColor not available or only 15 – 20 year warranty
40 Year Rust Perforation Warranty on Galvalume Coating backed by steel mill and manufacturersGalvanized steel with no warranty
100% US Buildings, USA made with USA steel; meets Buy American, and American Recovery ActsForeign made can’t meet Buy American or quality standard and sourcing requirements
Approved by US Army Corp of Engineers (USACE) meets military specificationsDoes not meet USACE Specifications
Engineer certified design for USA, Canada, Euro CodesNo international approvals, limited USA State of certifications
Superior tensile strength, high yield 80,000 KSI Galvalume steel and 50,000 KSI if bid specifications require itUse lighter tensile 33-37 KSI steel
Pre-fixed assembled durable polyethelyne washers on boltsNo washers, or cheap rubber washers that dry out
Standard, Grade 8, 1500hr KC tested bolts, optional stainless, Grade 5 and Grade 2 with 1,000hr KC salt spray testGrade 2 bolts only, none others
Consistently high tech quality control on fully automated production line with roboticsManual production with inconsistent quality control. Problems in the field
Independent laboratory testing to verify certifications as required for USACE military projectsNo testing on material for quality control
Prefabricated, Preformed and Predrilled no welding or no drilling requiredNot predrilled, pilot spot holes require high labor field drilling to ream out
Reduced freight cost by coshipment with other dealer ordersExpensive single freight shipment cost
24 hour construction toll free hotline assistance even available after hours for the do-it-yourselfer. Dedicated customer serviceLimited assistance, no 24 hour or weekend and holidays service
Energy Star rated, LEED Compliant Galvalume steel quality for tax credits and may subsidize utility rates lowerNot Energy Star rated, not LEED compliant, and does not qualify for tax credits or reduced utility rates