Rooftop Support Blocks Made from 100% recycled tires and pre-galvanized steel, these heavy-duty roof blocks are built for long-lasting performance. Customize your Unistrut roof block system for a variety of applications, including gas, solar, HVAC systems, electrical conduit, roof walkways and more. G-STRUT Rooftop Support Blocks feature innovative designs that are compatible with most rooftop materials and resistant to floating and shifting. Weatherproof roof block materials inhibit damage due to freezing and thawing, and green reflectors enhance safety and visibility. Explore the sizes and configurations of rooftop support blocks available through Gregory Strut, or contact a member of our team today to discuss your needs.