Heat work of materials is the phenomenon of changes in the dimensions of building components caused by changes in temperature. It results from the thermal expansion and contraction of materials, which cause them to elongate when they are heated and shorten when they cool.
The thermal work of materials occurs in all elements of construction and finishing. Its magnitude, however, depends on the type of material, the extent of temperature change, the length of the component and the conditions under which it is fixed. It is particularly important in elements exposed to direct weathering. It has also important in structures with long spans or lengths.
Inadequate consideration of the heat work of materials can lead to stresses, strains, cracks and fractures. It can also cause damage to joints and finish layers. Therefore, this phenomenon is taken into account in design by using dilatation and expansion joints, as well as appropriate installation solutions that allow for free thermal deformation.
