What are fixed and sliding points, and why are they important in facade assembly?

Facades are exposed to constant fluctuations in temperature. The materials used normally have different coefficients of expansion. It is therefore important to constructively allow for the possibility of thermal changes in length. A support profile strip is fastened to a wall holder via a clearance hole. All vertical loads, e.g. the weight load of the cladding panel, are removed via this fixed-point wall holder. All other wall holders are designed as sliding points, which only accommodate horizontal loads (e.g. wind loads). For this purpose, screws are positioned as fastening elements precisely in the middle of a slotted hole. Due to temperature changes, the profile can now be contracted or expanded without any constraints, which in turn leads to bulges or dents in the facade.