All Koyker Manufacturing products are now live on SiouxSteel.com. View Koyker Products Pro·Tec Buildings Pro·Tec Buildings are manufactured by a company with over 100 years of experience! Whether you're in need of a storage building or a safe environment for livestock, Pro·Tec Engineered Buildings are the economical choice. They are easy to set up, easy to maintain, and easy on the pocketbook. Most importantly, they adapt to your needs and stand up to tough weather conditions. Engineered for stability & strength, your Pro·Tec Building can be customized to fit your needs, including Sentry Buildings that can store over 5 million bushels of grain! Pro·Tec Buildings provide natural lighting and superior ventilation, while offering unbeatable strength and durability. They are engineered to meet the needs of both small and large operations and are manufactured right here in the USA. Pro·Tec Buildings are available in open span widths up to 200 feet and can be manufactured to any length. Compared to wood or steel structures, Pro·Tec Buildings offer: Easy relocation Natural lighting Simplified installation Lower project costs Minimal maintenance Foundation choices We want to help you get the most value for your building investment. That's why we have engineered a building solution designed to protect your livestock, equipment, crops and anything else you need to store; while increasing your profits at the same time. SENTRY Series Gable Style Single Tube Category Applications Flat Grain Storage Category Options Meet Sioux Steel Careers History Product Lines Gifts & Apparel Explore Our Products Grain Storage Koyker Manufacturing Paddle Sweeps Pro·Tec Buildings Livestock Equipment Custom Products Find a Dealer Get In Touch Contact Us Customer Service Territory Managers & Reps Become a Dealer Return Goods Request More Information Upcoming Shows Find Resources Product Brochures Frequently Asked Questions Warranties Dealer Login 800.557.4689 Toll Free 605.336.1750 Local 877.782.3073 Livestock Made in Usa Patents Privacy Policy © 2021 Sioux Steel Company. All Rights Reserved. Site by