This task deals with the properties and the possibility of recycling of thermal insulation materials such as polystyrene and mineral wool, not only from buildings after demolition but also from discarded materials left over after the construction of new buildings. This newly developed material is being tested as a filler for ultra-lightweight concrete where it fills the cavities of ceramic hollow bricks, as a filler for self-compacting concrete (SCC) and for the production of acoustic facing.

The paper offers an overview of the performed analyses, which evaluated the leakage into underground garages in the densely built-up area of the Prague city centre. Only after a comprehensive reassessment of geological conditions, the project and other available information was it possible to determine the probable causes of leakage into large underground parking spaces.

The presented paper strives to assess the influence of the type and material composition of the roof on the course of temperatures in the roof structure by the so-called dynamic method.

This contribution deals with damage to buildings and building materials due to bad manage of rainwater regime. Effects are divided according to location of damage. First, the damage of roofs and roof trusses is presented, which are followed by examples of damage to the enclosure walls. The most attention, including numerical 3D modeling, is devoted to damage to foundation structures and foundations.

This paper deals with the test results of shear characteristics of thermal insulation boards based on MW with longitudinal orientation of fibres of thickness 200 mm and more according to ČSN EN 13162+A1, documents serious faults in test procedure according to current ČSN EN 12090, reasons included, and proposes possible way of their solution.

In the expert business, the usual requirement is to find a possible fault, its cause and a proposal for how to eliminate it. More and more often, however, in expert practice I encounter the requirement to simultaneously assess the current state of the flat roof and especially the waterproofing layer and comment on its possible further functionality and durability.

The paper is presenting problems that are to be solved within expert opinions focused on wooden houses which foundation is designed as a crawl space.

The present paper deals with the assessment of several realized construction details within the renewed flat roof of the multifunctional building. The new roof structure has the composition of a single-layer flat roof with a classic order of layers, which is mounted on the original roof structure. The problematic details are closely related to the incorrect realization of the waterproof membrane and its fitting to the individual building structures within the detail. Individual factors play a significant role in the assessment: absence of additional elements (cover and anchor strips), improper drainage of rainwater from the roof surface and improper handling of accessories within the waterproof membrane. The assessment of the individual details revealed significant shortcomings that can cause rainwater penetration into the roof structure and thus endanger the reliability and durability of the roof.

This paper deals with the content of prepared review of ČSN 73 2902:2020 External thermal insulating composite systems (ETICS) – Design and application of mechanical fastening for fixing of ETICS in the base material. It specifies modifications made in content of standard and in particular the addition of new provisions for correct assessment of the stability of the ETICS.

The paper deals with construction modifications of the public building complex roof, which was repeatedly flooded. The roof structure consists of a combination of a sloped roof around the perimeter of the building and a flat roof above the inner space of the floor plan. In the article the authors focus on solving the atypical detail required by the roof modifications.

In modern building systems, sound insulation of walls is often made of multi-layer structures. This article deals with the acoustic operation of such structures and discusses the importance of proper implementation. It also warns against limited sound insulation at low frequencies, which is often not given enough attention. Software for calculating sound insulation - INSUL - was used to compare the acoustic behavior of structures and for simulations.

From the point of view of sustainable development in construction, the possibility of using easily renewable raw materials for the production of advanced thermal insulation materials currently represents an interesting way to effectively reduce the energy consumption of buildings. Insulators with ever-increasing thicknesses are being utilised in buildings; the use of these raw materials allows for the insulators’ production without the need for a substantial increase in CO₂ emissions and energy consumption.
Natural fibres generally display very low thermal conductivity. Despite their relatively great thickness (in the case of technical fibres) these fibres are porous, and upon reducing pressure they show significant loss of thermal conductivity. Remarkably, it is the same in the case of materials based on glass fibres, which are used industrially in the production of vacuum insulators. When using natural materials as thermal insulators there is a common problem with their high sensitivity to humidity and consequent degradation of thermal insulating properties upon increasing their water content. In the case of using natural fibres for the production of vacuum insulators, these fibres are protected against humidity by a barrier foil that creates a vacuum insulation panel (moreover, the panel also always contains an active dryer), this is why their use in this field is so interesting.

Contractors tend to ignore design solutions to reduce the cost of construction. Change of materials, absence of building elements, adjustment of layer composition, application of cheaper alternatives – these are common situations in construction practice. In certain cases, these modifications are without consequences, but in such a situation it is necessary, among other things, to take into account the laws of physics. This article deals with the case in which the structure was replaced – instead of the reinforced concrete ceiling slab, the contractor chose a wooden structure. Wood has significantly different properties than reinforced concrete, so it is necessary to take into account several aspects such as statis, thermo-technical properties and last but not least – with whitch this article deals with – moisture conditions in the structure. The relationship of wood and moisture is specific, the article assesses a specific case of such a structure, lists the possible consequences and finally suggests the most appropriate solution – adjusting the composition of this particular ceiling structure to meet the requirements.

White tanks are structures which, in addition to the load-bearing function, must also have the function of watertightness. Watertight of the concrete is ensured by adherence to design, production and technological measures. The width of the early-age cracks that former in the structure is controlled by the reinforcement. During construction, however, joints (expansion, construction and control) are created in the structure, which must also be watertight. The joints are the most sensitive place of the white tank and therefore the most leaks are created at the point of the joints. The correct choice of the joint sealing system is the basis for the design of the watertight joint. The paper deals with the description of various joint seal and pipes through of the white tank.

In this paper, the authors consider the aspects of routine procedure compared to the expert approach in solving construction defects and failures. For better orientation in the issue the basic terminology of defects and failures sphere is given. Also, the authors describe in details the course of both solutions, contemplate their specific aspects and point out their consequences. An essential part of the article is presentation of the potential benefits of the expert approach, the advantages of the expert approach are emphasized in the conclusion.

The paper discusses the importance of water absorption of traditional building materials and the ability of traditional non-insulated buildings to withstand rising damp. It also draws attention to some of the risks involved in reducing the water absorption of building materials designed for remediation of moisture and salts problems of traditional buildings.

Any roof likely to fall from a height shall be fitted with a handrail or restraint system as appropriate for the intended operation. Protection of persons against falls from a height must be addressed already during construction. Therefore, Act No. 309/2006 Coll. in its current wording, it specifies the work of the contractor and sets out its obligations. In addition to this Act updated in 2016, it is of course necessary to take into account other legislative requirements in the construction process. This implies many responsibilities of individual construction participants, which will be discussed in this paper.

The flat roofs of warehouse and production halls show some typical defects. A very common cause of roof problems is incorrect implementation of anchoring detail of the attic. The causes and solutions to these typical defects are described below.