Daylighting design of buildings is a neglected discipline of building physics, although it is an important element of a healthy indoor environment, since daylight influences the well being of every living being inhabiting a space inside and outside of buildings. It influences the biological rhythms of humans and also enables a visual feedback from the surroundings. To evaluate daylighting inside of buildings one may use any of the available numero-graphical or numerical approaches as much as computer tools. Nevertheless one does not know how precise these methodologies really are. The values of sky, externally and internally reflected components of the obtained daylight factor may vary depending on the given tool, used. To prevent such errors CIE did publish a technical report for the validation of computer design tools, howbeit it can be used to verify the quality of older methods too. The aim of the paper is to point out, that numero-graphical approaches can sometimes determine the daylight factor levels with a smaller errata in contrast to newly developed software, particularly if it handles about the sky and externally reflected components of daylight factor.

The paper deals with issues connected to shrinkage of industrial concrete floors and the consequent formation of cracks within the structure, since it handles about an undesirable effect. A huge number of cracks may cause serious defects and faults. The beginnings of the paper do summarise the theoretical background of volumetric changes, discusses their types and explains the possible methodologies for their measurements, the major objective of which is focused on the determination of the amount of cracks. Inside of the experimental part three samples are monitored with respect to shrinkage. The measurements are done with the utilisation of a shrinkage drain and are carried out for a time interval of 12 hours, whereas the structure moves the most under this particular time period. In the last chapters it comes to an evaluation of the results. This includes a comparison of obtained data against normative requirements dealing with shrinkage, and a subsequent a comparison of samples, since the observations are done under the exact same boundary conditions