Number of steps
The total number of steps provided in the design of the stairs. This parameter is indicated rather for reference — the primary characteristic is still the height of the stairs. Note that when calculating the number of steps, the footboard is also taken into account (see below).
Max. load
The maximum weight a ladder is guaranteed to be able to support without breaking. When choosing an option for this parameter, it is worth considering not only the weight of the user himself, but also the additional weight — equipment, tools and other items that are planned to be used in the work. Also, it is necessary to make a margin for the maximum load. This is due not only to the fact that different people with different equipment can use the stairs. The fact is that this parameter can be measured by different methods, including with the help of a fixed load installed on the ladder; at the same time, a person, even during the most calm work, does not stand absolutely still. Accordingly, there are irregularities in the load, and it is quite possible that at some points it will exceed the calculated one even with a seemingly acceptable weight. This is fraught with breakdown at the most inopportune moment. Therefore, when buying, it is advisable to make sure that there is a weight margin of at least 10-15 kg — this will minimize the risk of such troubles.
Max. height
The maximum working height of the ladder. In models that do not have a footboard (see above), this parameter is usually indicated in the specifications for the total length of the stairs. It is worth noting here that the height of the upper step in such cases rarely corresponds to the working height to the nearest centimeter - firstly, the stairs are almost never strictly vertical, and secondly, the outermost steps are usually not on the very edge. However, in most cases this difference can be neglected. If the design provides for a footboard, then the height is measured along it.
When choosing a ladder by height, it should be taken into account that the longer the structure, the greater its weight and, usually, the higher the price. Therefore, buying a model with a long length makes sense only when there is a real need for it.
Dimensions (folded) (LxW)
Ladder dimensions in fully folded position. The smaller they are, the more convenient the ladder will be in storage and transportation. Usually, only the length and width are indicated in the characteristics, because. the thickness of modern stairs is very small and in most cases it can be neglected; and in some models, only the length may be indicated at all — for the same reasons.
The height as a stepladder
The maximum height of a ladder when used in ladder mode. This parameter is specified only for models that are not originally ladders (see "Type"), but can be used in a similar format. Usually the height is given by the height of the highest rung in the "ladder" installation.
Weight
The total weight of the ladder. On the one hand, the lighter the model you choose, the more convenient it will be to carry, the less effort will be expended. On the other hand, lighter weight means less material used in the construction of the stairs, and this can adversely affect reliability. Therefore, it is worth choosing an option for this parameter depending on the planned features of the application. If the expected load on the ladder is significantly lower than the maximum, then you can not pay close attention to the weight. But if you have doubts and/or plan to work in difficult conditions with a heavy load, you should choose the more massive one from two models with the same characteristics. It is unlikely that this will seriously affect the cost of forces, but the risk of breakage and a dangerous fall will decrease significantly.
