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A stair tread is the horizontal portion of a set of stairs on which a person walks. The tread can be composed of wood, metal, plastic, or other materials. In residential settings, treads can be covered in carpeting. Stair treads can come in non-slip varieties, particularly in commercial or industrial locations. [1]
The nosing is the protrusion beyond the riser when vertical risers are used, or beyond the back of the tread below, when angled risers or no risers are used. Anti-slip strips or nosings may be applied. These stair parts can be manufactured from a variety of materials including aluminum, vinyl, and wood.
Where there is insufficient space for the full run length of normal stairs, "alternating tread stairs" may be used (other names are "paddle stairs", "zig-zag stairs", or "double-riser stairs"). [ 16 ] : 19 Alternating tread stairs can be designed to allow for a safe forward-facing descent of very steep stairs (however, designs with recessed ...
The most common alloy used for aluminium tread plate is 6061, although 5086-H34 and 3003-H231 are also used. [1] Diamond plate is usually steel, stainless steel or aluminium. Steel types are normally made by hot rolling, although modern manufacturers also make a raised and pressed diamond design. [citation needed]
The platform and stairs usually consist of open steel gratings, to prevent the build-up of ice, snow, and leaves. Railings are usually provided on each of the levels, but as fire escapes are designed for emergency use only, these railings often do not need to meet the same standards as railings in other contexts.
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