There is a wide range of fixings to choose from. They are available in short, ribbed or spiral versions. But what is each fixing suitable for?
To select the right fixing, the building material in which the fixing is intended to bear load must be taken into consideration. A distinction is made here between wood, the various types of concrete, dense masonry walls (limestone, brick, clinker), porous walls (porous concrete, aerated concrete, pumice concrete) and board materials.
The types of fastening are distinguished according to the type of force transmission into the structure – these being friction closure, form closure and material closure.
Plastic fixings are most commonly used for friction closure. The most simple type is the classical expansion plug, which holds best in concrete and masonry made of solid stone. The expansion part of the plug is pressed against wall of the drill hole; the friction created by this holds the plug in the building material.
With form closure, the fixing folds open in the cavity of the building material. In other words, it adopts the shape of the cavity in the building material. These kinds of fixings are particularly suitable for fitting in hollow core bricks or board materials. They are available in different versions, e.g. as all-purpose or cavity fixings.