The Dura-Grip General Code stair is designed for portable building access that requires International Building Code and ADA Compliance. You can assemble these stair systems in minimal time and adjust them to varying threshold heights. General Code compliant access to portable classrooms, site built, and modular buildings Non-corrosive and non-combustible maintenance free durable aluminum fabrication Minimal parts with slip in rails and legs for easy installation Strong and stable slip resistant and self-draining deck Minimal assembly resulting in fast installation Lighter in weight than comparable systems 1 Year warranty Landing and stairs designed for 100psf live load and a concentrated load of 300 lbs.