All API Structures are manufactured to conform to a variety of military and building codes for 40 PSF snow loads and 120 MPH winds. They are made of aluminum frames with flame resistant PVC coated polyester scrim. Fabric is mildew and bacteria resistant as well as treated to prevent ultraviolet degradation. Fabric is rated for 15 - 20 year exposure and available in many colors. API has 18 years of experience in supplying all branches of the United States and overseas militaries. We have a long list of references that we will provide upon request. The bottom line is that when you do business with API, you can be confident that we will perform up to your expectations.