Accuracy

In the mid-1980s, Czechoslovak standardizers introduced the dimensioning of construction drawings in mm instead of the previously used centimeters. However, this bold measure had practically no response in practice, as our construction industry was dealing with accuracies far exceeding centimeter dimensions, and it seemed that measuring in elbows would dimensionally fully correspond to the conditions of the construction sites at that time. A breakthrough came only with the open competitive market environment allowing the entry of quality foreign manufacturers.

One of them is undoubtedly the YTONG group. In the 1990s, the group took over the production of Siporex in Hrušovany near Brno, and with significant financial resources, reconstructed it to a level corresponding to advanced global manufacturers. Production was fundamentally refined and led to the effort to apply thin-layer masonry mortars, which requires the production of so-called precise blocks. These blocks exhibit very small manufacturing tolerances. It is not only about height, width, and length; angular deviation also plays an important role. If the desired production accuracy is achieved, thin-layer masonry can be applied – using "glue" instead of traditional mortar. YTONG also achieved this goal in the first half of the 1990s.
The manufacturing height of the precise block was chosen in accordance with European practice at 248 mm, which corresponds to the compositional height of a "layer" of 25 cm. This height is common for so-called metric divisions. The difference of 2 mm is to be filled by the aforementioned thin-layer mortar. For other building materials for the rough construction manufactured in the metric system, the manufacturing height is 238 mm, and the mortar "claims" the remaining 12 mm. It is logical that these 12 mm must be mixed, delivered, picked up, applied, spread... In short, it is practically six times the amount of binder that needs to be incorporated. The right angle of the material guarantees that if the first row is carefully laid (and YTONG provides a qualified expert for this purpose free of charge), no corrections are needed during the masonry process. The work is very easy and above all fast. Hand in hand with this high precision goes easy processability. YTONG very conveniently rents band saws, on which there is no problem cutting pieces to a thickness of just 10 mm. And practically "without waste." No other building material for rough construction can be processed with such precision. The last gain that the customer adds to the account of benefits is the final flatness of the masonry. If the wall is really built carefully, it is possible to work with an accuracy of 1 mm when measuring with a two-meter batten. A low layer of internal plaster and a reduction in costs are then the reward for the right choice of material and invested diligence.
The path of refining manufacturing dimensions that the YTONG group embarked on in the 1990s is an inevitable path of progress. This trend underscored the previously well-known benefits of the material in terms of ecological, economic, production-energy, and many other technical-physical properties, thus placing YTONG material at the forefront of materials for rough construction not only in the present but also for the distant future.