Paper will inform you about the results of a comparison of several hydrophobic additives. Building components based on plaster without special treatment generally have high water absorption (~ 30 %) and they are therefore not suitable for areas with high incidence of moisture, where they can be exposed to direct contact with water. The trend leads towards lighter building materials, which often leads to an increased proportion of open porosity and thus to increased absorption. A suitable solution is utilization of hydrophobic additive during the production of gypsum building elements. Appropriately chosen additive can significantly reduce water absorption, even at relatively low addition and high mass lightening of element.

The 70-ers and 80-bit of the last century were developed a number of standardized structural framing wood-based, which produced the then national wood processing plants. Several of these systems have been specifically developed for agriculture, in which wooden structures are preferably applied mainly for objects with increased aggressiveness environments such as. storage of fertilizers, stabling facilities etc. Some of these buildings still serve their original purpose even today, although their structures are weaknesses of different nature.

The weakest part of concrete high-rise block are their envelopes, so most of regenerations are dealing with reconstruction of existing envelopes. It related of the replacement of window openings, the installation of additional contact thermal insulation or modifications of projecting structures, including loggia glazing and, last but not least, changes in the colour shading of the surface façade layer. These adjustments can improve energy efficiency of the building, but secondary negative effects on the interior environment in terms of the daylight level must also be considered. In this study we tried to take account of both width and shape of jamb of the window with taking into account the effect daylight inside the room.

The paper is focused on hygrothermal performance of light pipes used in Kaprálův mlýn center. It is present an analysis the condensation risk in roof dome of light pipe and on surface of double insulated glass in cool part of light pipe. Insulated glazing is integrated to thermal insulation block made of extruded polystyrol.

This paper is the first part of the series about windows and doors on TZB-info. The series will be focused on all elements of windows and doors, their design and construction. We will highlight in detail the most important aspect for choosing new windows or doors. This first part is focused on windows and doors with plastic frame.

Timber-concrete composite structures which use advantages of both materials are suitable for new works and reconstructions of civil and residential buildings. There are described many methods of joining between timber beam and concrete slab in technical literature. Joints are more and more sophisticate which brings higher demands of work control and technology. Main goal of this paper is in design technologically low demanding method of joining with steel plates and nails, to test its shear strength and compare it with other similar joining method.

Analysis of the problems associated with ventilated spaces under the building focused on the specific conditions of wooden buildings with low energy performance and climatic conditions in the Czech Republic. Specification of principles for the design of adjacent structures.

The paper is concerned with some selected defects and failures of timber structures and their rehabilitation. The paper summarises some conclusions from the construction and real behaviour of selected timber systems. Due to the fact that their load-carrying capacity and deflections are considerably affected by the load-carrying capacity of the joints, it was de-sirable to verify the influence of structural design of fasteners and connectors on the over-all behaviour of structural systems. Findings from behaviour of structures after their reha-bilitation are crucial for further research into real behaviour of timber structures.

This paper deals with the time period of condensation on the inner surface during the day and the severity of this phenomenon. Condensation on the surface structure occurs when the surface is cooled to or below the dew point temperature, which is a function of temperature, relative humidity and atmospheric pressure.

The article describes what a National Heritage Institute, its scope, location of sites and activities. The following are types of divided heritage protection, (cultural monument, national monument, conservation). In conclusion, described the law on state conservation), obligations for owners and likes the cultural monuments.

The work describes the divisions of contemporary and traditional solid wood constructions. The introduction briefly explains the historical development of timber structures and the advantages that these structures provide. Individual structural systems are described according to the basic elements and usage possibilities. The requirements for the massive wooden houses are listed in the form of technical standards and laws that have to meet.

This paper deals with the basics of the so-called “Massive Timber Construction“ (MTC) system. The paper is focused to the design of MTC system (mainly design of floors, shear walls and connections) which is made from the relatively new wood-based product “Cross Laminated Timber” (CLT). CLT consists of several layers built-up with boards. Their assembly in orthogonal directions allow them to produce elements with big dimensions. Currently, no regulations for the design of CLT-elements are given in the European standards. Nevertheless mechanical parameters of CLT-elements can be determined on the basis of the properties of the single layers as is shown in the paper. It is expected that CLT will play an important role in the future use of wood in single and multi-storey buildings.

Thermal stability of rooms affects the local characteristic of the area, building geometry, orientation to the cardinals, the ability of heat storage, mean and intensity of ventilation, and also the size and properties of transparent parts of facade along with their shading. The most effective way to prevent the overheating of the room is to reduce heat gains through transparent structures by shading. Shading by overhanging structures is expressed by sunlit factor fs. This factor changes during the day, with the movement of the sun, and thus the determination for calculations is difficult. This paper deals with a comparison of two different methods of calculation, their comparison and the final comparison with the measured data.

The current knowledge about deformation of mechanically fixed insulation in the ETICS is based on the new tests of anchors. New experience shows that performance of the anchors is limited. It deals especially with dynamic load tests simulating the long-term effect of the wind on facades.

This paper deals with possibility of using recycled construction and demolition waste as aggregate for concrete. The European Standards describes tests and properties of recycled aggregate for concrete. The main aim of this investigation was determination of recycled aggregates properties and their comparing with properties of natural aggregate and requirements in Standards. Selected geometrical and physical properties were tested and results were used to design concrete mixture. It was found that the main differences between natural and recycled aggregate is water absorption. Water absorption of recycled aggregate was more than ten times higher.

Measurement of short term water absorption and thermal conductivity was carried out on samples of traditional insulation and the insulation samples from natural fibers. Further, the measured change in thermal conductivity after soaking and subsequent drying of the original weight.
The results showed that the thermal insulation of natural materials retain their original properties – thermal conductivity, shape, compared to conventional insulation.

The article deals with sound insulation of wooden house constructions, including the national requirements for sound insulation of walls. There is also a brief description of the laboratory measurement of the sound insulation of wall constructions and information about the sound insulation of single and double wood-based structures.

A new type of circular wind bracing has been developed for stiffening of high-rise slender steel structures. This bracing can use pre-stress to modify its stiffness to achieve required properties. The models scalled 1/20 are subject to static and dynamic load laboratory tests in order to prove theoretical conclusions and to adjust optimal values of pre-stress.

The term “ancillary materials” covers a wide range of products (mouldings, profiles etc.) which significantly influence the overall quality of works. As legislation normally does not require any verification of performance and no relevant standards exist, verification and declaration of performance is usually omitted. In reaction to that, we have specified characteristics and verification methods for adequate and consistent verification of relevant characteristics in the framework of voluntary certification.