Zolyndo Portable Prefabricated Tiny Home 13x20ft, Mobile Expandable Plastic Prefab House for Hotel, Booth, Office, Guard House, Shop, Villa, Warehouse, Workshop (with Restroom) Safety and Durability: Constructed with a steel frame and flame-retardant foam wallboard, this container home prefabricated is waterproof and thermally insulated. It’s earthquake-resistant (grade 8) and wind-resistant (grade 10).