Stair calculator provides parameters for construction calculations. Minimum tread length is 10 inches (25.4 cm). Maximum riser height is 7.75 inches (19.7 cm). Stair width should be at least 36 inches (91.44 cm)
AutoCAD was first released in December 1982 for CP/M and IBM PC platforms. Derived from Interact CAD, which started in 1977. Became most ubiquitous CAD program worldwide by March 1986. Later versions released for Windows, macOS, iOS, and Android
Sandwich panels consist of three layers: low-density core and thin skin-layer. Core material resists shear loads, while face sheets resist bending loads. Panels can be honeycomb or solid filling with thicknesses from 40mm to 200mm
Specifies technical delivery conditions for hot rolled non-alloy structural steels. Applies to flat, long products and semi-finished products. Excludes structural hollow sections and tubes
CEN approved this European Standard on April 23, 2004. Available in English, French, and German versions. CEN members must comply with national standard requirements
British Standard BS EN 12020-2:2016 supersedes EN 12020-2:2008. European Standard EN 12020-2 approved by CEN in March 2016. Published in English, French, and German versions