The aim of the research was to find the relationship between the dimensions of the shelf materials and the spans made of traditionally used board materials of a thickness not exceeding 20mm. In the process of study quantitative and grapho-analytical research method was used. There are done constructive technologically board shield bearing capacity improvement solutions to the used board materials. The selected board materials were tested for constructive technologically board shield bearing capacity improvement solutions. Dismountable construction fittings, round pin and cam tie (stationary rack), and shelf holder (adjustable shelf) were used. To achieve this goal 52 shelves of the length of 764 mm, 964 mm and 1164 mm were made. The strength and stability of shelves was tested with the loading method set according to LVS EN 14073-3:2004 standard. The results of the experiment were compared with the results of the program “The Segulator”. According to the standard the shelves were fortified in cabinet and loaded evenly throughout the length of the shelf (764 mm − 33 kg, 964 mm − 42 kg, 1164 mm – 50 kg). The stiffness of the shelf was measured in the mid-shelf extending it to a straight-line starting position. The results showed that the most effective way to improve the stiffness of the material is to thicken the sides and to produce laminated shelves. Further studies should be carried out using other ways of shelf thickening, other wood materials and adhesives, as well as looking for other options of improving the stiffness of the shelf. The aim of the study was achieved. The results confirmed that the best solution in the construction of long span shelves is to use the thickening application or adhesively bonded twisted material. The flexural strength of fixed fortified shelves varied depending on the degree of the reinforcement, the difference on average being three to five times, but for the the adjustable shelves up to 3 times