our Domes tent are engineered for both internal and external weight loads, and support lighting and sound equipment. We offer an in-house structural analysis upon request. To be approved for permitting, your local building department may require engineering documents. Our architect and engineer can help you meet your requirements.Our frames are made of USA galvanized steel. They are engineered for both internal and external weight loads, and support lighting & sound equipment. our dome tent are the most durable structure, utilizing the least material.