 CPCI Canadian Precast Concrete Institute " Double tee slabs can be used for most applications requiring a long span floor or roof system (10 m to 30+ m) and/or additional load carrying capability ... Parking garages, office buildings, commercial buildings, gymnasiums, pool roofs, food processing plants, paper mills, industrial buildings, and sewage and water treatment plants are all ideal applications. Slabs can be cantilevered at one or both ends for up to 4 times the slab depth.."  " Precast prestressed concrete double-Tee units frequently offer an ideal architectural and structural solution to achieving longer spans. Unit widths are generally about 2400 mm and spans may be 16 m or more dependent upon loading [...]
The A-Z of double-TeesThey have proved particulary popular for multi-storey car parks, shopping centres, offices, leisure facilities and factories, as well as for light bridges. Indeed, they can be used to advantage almost anywhere that long spans, high loadings, ribbed soffits or, equally importantly, fast construction times are required " CONCRETE July/Agust 1995
2) Standard depths
b. Double tee = 10?-24? 
Forjado de hormigón armado. Interejes de 60 cms. Grandes luces (hasta 12 m o mayores) . Grandes sobrecargas.
Thus the ratio L/d can be seen to be a measure of performance as well as a ratio that can be controlled by the designer. This simple calculation, as well as the experience of many designs, has led to sets of "Rules of Thumb" used to establish system and member depth or thickness. The following are "rules of thumb" for minimum depth of concrete, wood and masonry structures that should assure good performance: L = clear span, H= clear height, and S= clear width.
 CPCA Canadian Portland Cement Association Oldcastle Precast Building System
"double tees are available 10’ and 12’ wide in depths of 24" to 36”. Stems can be dapped to lower section depths depending on application. Standard lengths to 60’ but custom designs can exceed that" 
WCP Wells Concrete Products Structural Precast Concrete
Pre-cast Specialties, Inc. (PCSI) STRESSCRETE
>Stresscrete Double Tee is specifically designed for suspended floors in large commercial buildings The prestressed spans come in two standard size modules (other sections are available), 1200mm and 2400mm wide. Typical spans for Double Tee sections range from five metres to eighteen metres. Differing sections are available within these ranges to accommodate specific design Double tee floors
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