Spiral Stair Design Plan Section Railing Detail with Dimensions

This spiral stair design plan presents a complete drawing set, including a circular stair plan, sectional elevation, tread layout, central column detail, and railing connection specifications with dimensions. The layout illustrates step-by-step tread arrangement around a central structural core, showing riser height, tread width, inner radius, and outer radius measurements for accurate circulation planning. Detailed base plate fixing, anchor bolt positioning, and support frame alignment are clearly defined. The sectional views indicate floor-to-floor height, stair slope, landing integration, and vertical clearance to ensure safe and functional movement within the space.