First take the dimensions of the stairwell opening. All our stairs are. Pin On Spiral Stairs As per BS5395-2 1984This provision makes the stairs to fit comfortably in the given space. . Technical Specifications and CAD Drawings. Free Spiral Stair Details The dwg files are compatible back to Autocad 2000 These Cad Drawings are free download now. Spiral Staircase Residential Spiral Stairs follow a helical arc and the treads radiate around a central pole. Ad Best Spiral Stair Kits In The Industry. Spiral Staircase Residential Spiral Stairs follow a helical arc and the treads radiate around a central pole. Cover for durability fire and bond requirements EN 1992-1-1. 1900mm The opening left for spiral staircases is 15 cm more than the diameter Vatican Museum Staircase. Ad Quick Quotes and Personal Touch set us apart. Staircase technical specifications and CAD drawings for developing your spiral and circular sta...