Passive houses reduce the need for heating to compensate the heat loss through the building facade and ventilation. But at the same time it increases consumption of the auxiliary energy for circulation pumps and fans. The analytical result can be for many readers quite surprising.

Paper presents an example of energy performance calculation according to the current methodology of evaluation of the energy performance of buildings. The example shows how it is unreal to achieve the passive standard by another insulation. It is possible to meet the energy requirements for heating buildings by non-traditional forms of energy such as using heat pumps with photovoltaic systems, etc.

Assessment of existing buildings and their refurbishment is very delicate task. Every multicriterion assessment tool in the world is dealing with this problem in its own way. In terms of the Czech conditions and assessment tool SBToolCZ, cultural-historical value was taken into account in reSBToolCZ. Because this value significantly influences the possible scale of renovation interventions.
The assessment method reSBToolCZ takes into account cultural-historical value and involves it into the evaluation in a way that it is a part of the overall result. The principle is a relative setup of those criteria which are connected to the cultural-historical value. The setup depends on the scale of the possible building interventions. Currently, testing of the methodology is being made on existing buildings.

Analyze of passive buildings internal microclimate is described in this contribution. The article focuses on inside state from point of view of thermal -moisture, odour, aerosol or toxic assessment and its influence on inhabitants health. A separate section discribes the inside moisture level during ventilation or passive buildings heating.

When evaluating the fire protection of building structures, the designers often get into situations when they have to choose the most appropriate option. The issue is usually not clear and brings the intuitive solution. In all these cases, decisions can be applied by using mathematics. This paper shows a variant solution in the possible ways of assessing the optimal choice of fire protection equipment in buildings. The methods and principles of the solutions are complemented by practical examples.

When heat and energy assessment of existing buildings it is often a problem to determine the heat transfer coefficient U. In many cases it is possible to use a relatively simple measuring device. The device is designed only to measure heat transfer coefficients for vertical facade structures. It could be alternatively used for horizontal structures such as ceilings and floors as well.

One of the oldest remedial measures include insulation with air cavities. The most effective solution is to create a nationwide voids under floors designed to ensure air movement. This leads to diffusion of water vapor structures and thereby reduce moisture. These measures can not be undertaken alone, they are always part of a combination of remedial interventions. An example of such a solution is given on a complicated historical building in the middle of Prague - in the palace, which is situated in steep terrain notch below the Prague Castle.

Energy performance of the building is fundamentally influenced by its cover. Glass and opaque part of of the building envelope affect both sides of the heat balance - heat gains and losses. Their effect is influenced by meny other factors. It can not therefore in general and clearly be said how to design the individual elements the building envelope to achieve optimum ratio of profits and losses. This paper focuses on family houses and describes how for different variants of houses with different envelope parameters changes the influence glazing and shading, and their optimum potential in terms of heat balance in the winter and summer.

Comparison of the Czech methods for measuring the flatness of industrial floors with methods defined in the German standards (DIN), American standards (ASTM and ACI) and the British document (TR 34).

Base layer of the floor, either concrete slabs or anhydrite based, does not at first glance, but can significantly affect the final aesthetic appearance and functionality and durability of the wear layer flooring. In today's hectic the technological breaks are getting shorten to a minimum, often laying the surface layer is processing, although the substrate is not yet ready. It is therefore important to check its readiness (ie humidity) before installing the final layer in an appropriate manner. Post presents the methods used at home and abroad to determine the moisture condition of the base layer of the floor. For each method there are presented their advantages and disadvantages and limitations.

In connection with the new wording of the Energy Performance of Buildings Directive EPBD (recast), 2010 [1]) it is certainly necessary to discuss the next generation of buildings with minimized energy use. It should be noted the connection between the clearly described categories of low-energy and passive buildings on one side and zero-energy buildings on the other. Moreover the directive contains a number of other important issues, among others the setting of energy criteria on so callled cost-optimum level.
The paper comments the possible set of criteria describing in a unified way all categories of energy optimized buildings, including passive and zero-energy buildings. New Czech technical standard CSN 730540-2 Thermal protection of buildings. Part 2 Requirements [2] (November 2011) supports this approach.

Ensure environmentally friendly disposal and possible recycling of old and damaged clothing is quite problematic in practice. The problem with waste disposal of textiles is the fact that clothing is a waste mixture of natural and synthetic fibers. The paper deals with possibilities of development and production of insulation materials based on waste textile fibers and their subsequent application in modern floor construction.

This paper describes the results of research aimed at studying the real hygrothermal behaviour of different types of cellular concrete products for masonry structure, particularly in terms of thermal characteristics depending on temperature and moisture content of the material.

Calculations of heat transfer through soil according to ISO 13370 [1] and EN ISO 10211 [2] are rare. They stands out not only for the specific subject of interest, but also for a completely different philosophy of the calculation for determining the physical quantities. It is clear that this is unfortunately in conflict with the definitions and in conflict with real physical phenomenons. We try to approach the reasons for this assertion.

The author in his paper examines in detail the individual steps that make up the course selection process for energy services provider. Special focus is on the evaluation of the bids submitted in the tender.

For some time I start to have an allergy to the word ecology and ecological architecture. These words can mean many things, depending on what you need. So I'll try to put my opinion into a more specific framework. What is green architecture? Why is modern architecture abnormal when waste is normal? What is the situation in the Czech Republic for the use of "POTENTIAL SAVINGS?" How is the Czech Republic architecture environmentally friendly?