CSI SAFE 22 - Tool for designing concrete floor and foundation systems. CSI SAFE for Windows PC is the ultimate tool for designing concrete floor and foundation systems. From framing layout to detail drawing production, SAFE integrates every aspect of the engineering design process in one easy and intuitive environment. SAFE provides unmatched benefits to the engineer with its unique power, comprehensive capabilities, and ease of use. Laying out models is quick and efficient with sophisticated drawing tools or using one of the import options to bring in CAD, spreadsheet, or database programs. Slabs or foundations can be of any shape and can include edges shaped with circular and spline curves.