By variety of types and a complete set of solutions to the problem of convenient and comfortable recovery from one level to another, especially in cramped conditions, when the installation of fixed ladder structure is impossible because of the small size of ceiling aperture. The second important advantage of the attic stairs - they do not permanently occupy valuable space. Maximum load on stage for all types of ladders - 150 kgf. Years of experience identified as the standard size in height from floor to ceiling or ceiling aperture size, tilt angle march (64-68 °), the thickness of overlap. The basis of the principle construction of convenient and safe recovery (downhill), ease of use. During the operation attic ladders do not require additional adjustments. In the case where a ceiling opening is not possible under the standard dimensions, attic stairs can be made on individual size, based on the constructive opportunities selected.

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