Types
Bleacher structures vary depending on the location, but most outdoor modern bleachers have either an aluminium tube or steel angle understructure (known as frame-type bleachers) or steel I-beams (known as an I-beam bleacher). Most smaller bleachers are frame-type bleachers and most larger bleachers are I-Beam bleachers. A bleacher is known as a grandstand when it contains VIP seats. Bleachers range in size from small, modular, aluminum stands that can be moved around soccer or hockey fields to large permanent structures that flank each side of an American football field. Some bleachers have locker rooms underneath them. In indoor gyms, bleachers can be built in so that they slide on a track or on wheels and fold in an accordion-like, stacking manner. These type of bleachers are known as telescoping bleachers.
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