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What are the common parts of residential buildings in the Czech Republic?

19.6.2017 | Ing. Petr Bohuslávek, redakce
The definition of what is a common part of a residential building is essential especially when modifying the building structures and eliminating defects that affect both a common part and residential units. How common parts are defined affects who finances the modifications and reconstructions of such structures and parts. The definition of common parts is based on the new Civil Code (No. 89/2012 Coll.) and on the already abolished Act on Ownership of Housing (No. 72/1994 Coll.).

Securing brick buildings against the influence of technical seismicity

29.5.2017 | doc. Ing. Jaroslav Solař, Ph.D., VŠB TU Ostrava
The contribution dealst with the problematics of statical defects, or more precisely with the formation of cracks in the brickwork caused by the effect of technical seismicity. It further deals with the construction principles which can be used when designing reconstruction of buildings which are located within the reach of the effect of technical seimicity. The problematics of historical buildings and conservation areas is also mentioned.

The Effect of Local Thermal Bridges on Thermal Performance of Curtain Walling

17.4.2017 | Ing. Roman Jirák, Ph.D., Ing. Petr Jaroš, Ph.D., DECOEN znalecký ústav s.r.o.
U-value calculation of curtain walling is one from more difficult calculation in the civil engineering. In according to trend of increasing glassing surface of building envelope, the curtain walling has big influence on thermal behaver of buildings. This is why it is necessary to calculate the thermal insulation properties with special attention. This article focuses on influence of different local thermal bridges on curtain walling U-value.

The invention, patent or utility model - who should sort?

8.3.2017 | Ing. Zdeněk Lyčka
The article explains the differences between the invention patents and utility model from the perspective of Czech legislation. Also highlights the confusion individual categories and purposeful fraud by producers and sellers of equipment.
1 comment, 08.03.2017 07:44

Nearly Zero-Energy Buildings

9.1.2017 | Ing. Jan Antonín, Ph.D., EnergySim, Ing. Magdalena Purkrtová
For more than a year, a nearly zero-energy standard has applied to certain buildings. In the Czech environment, specific technical parameters for such buildings have been known for three years. And for over six years, the Directive on energy performance of buildings has been in force, imposing the obligation upon EU member states to introduce this standard.

Nevertheless, it seems that for many experts, including those in the field of energy, this term is still quite unclear. Many imagine buildings coated with photovoltaic modules from the ground to the roof, buildings which are better than passive ones or buildings which are self-sufficient, i.e. completely independent of public energy networks. Given the fact that the concept of a nearly zero energy building is very distant from such notions, and because this standard will soon become obligatory for all buildings, including small family houses, let's have a look at what a nearly zero-energy building really is.
6 comments, last 12.01.2017 14:25

Sound insulation acoustic tests in laboratory in situ

4.4.2016 | Ing. Pavel Rubáš, Ph.D., Technický a zkušební ústav stavební Praha, s. p.
Windows and door designed for noise reduction can be measured by two methods: laboratory airborne sound insulation (EN ISO 10140) and in-situ airborne sound insulation (EN ISO 104-5). The in-situ method mandates for averaging results of measurements taken in surface of tested samples for specific angles of incidence. Furthermore, the article presents some original formulas which could be applied for Rw improvement if the door or window does not reach a minimum requirements or if there are specific requirements for noise reduction. During the measurement of in-situ airborne sound insulation on installed doors or windows, the result can be contaminated by some specific factors like geometry, sizes etc., compromising the compatibility with the laboratory results. It has been noticed how these practical problems, jointly with the acoustical design in the presented formulas, can significantly increase the laboratory values of the product. Results of in situ tests are discussed in comparison with results obtained through a traditional tests performed in the lab.

A questionnaire survey of the state of school buildings

22.6.2015 | Ing. Marek Begeni, doc. Ing. Vladimír Zmrhal, Ph.D., ČVUT v Praze, Fakulta strojní, Ústav techniky prostředí
The article describes a questionnaire survey for mapping the state of school buildings, with a focus on the indoor environment.
1 comment, 22.06.2015 16:05

Defects occurring when renovating opening panes of buildings in preservation zones

8.6.2015 | Ing. František Stránský
In buildings registered in preservation zones the preservationists require keeping of the division and shaping of the opening pane girts and respecting of the original look of the facade. Keeping the girt profile, it is nowdays permitted to glaze the window wings using insulation glass. The manufacturers of windows still make many mistakes affecting not only physical characteristics of the opening panes but also their durability – life time.

The methodology for estimation of the thermal factor at the inner surface in the corner of glazing

1.6.2015 | Ing. Roman Jirák, Ph.D., Decoen v.o.s.
The surface temperature as one of the most watched parametres of the opening panes and light enveopes not only in the Czech Republic is being assessed in a view of risk of water vapour condensation, or more precisely in a view of their health and a hygyenic flaws and ecologically sound environment where inbuilt. The mening is determination if the structure is suitable for the marginal conditions or whether is necessary to choose another structure.

The methodology for estimation of the thermal factor at the inner surface in the area of glazing groove

18.5.2015 | Ing. Roman Jirák, Ph.D., Decoen v.o.s.
The surface temperature as one of the most watched parametres of the opening panes and light enveopes not only in the Czech Republic is being assessed in a view of risk of water vapour condensation, or more precisely in a view of their health and a hygyenic flaws and ecologically sound environment where inbuilt. The mening is determination if the structure is suitable for the marginal conditions or whether is necessary to choose another structure.
5 comments, last 26.05.2015 13:08

Double window – issues of design and implementation of replacement windows with recessed external lintel.

11.5.2015 | Ing. Petr Pohl, projektant pozemních staveb a rozpočtář, jednatel stavební a obchodní firmy
In the article, I would like to draw attention to the issue with an outside window lintel on existing double glazed windows. The lintel is mounted below the other lintel and can therefore when replacing windows in modern window to form a problem. The article presents possible solutions window lintel. The most appropriate way is a solution that includes the total renovation of the building envelope with the replacement of windows.
2 comments, last 11.05.2015 23:09

Verification of applicability of thermographical measuring of surface temperature and the influence of emissivity of glossy materials while eliminating the reflected radiation using a metal shield

26.1.2015 | doc. Ing. Jaroslav Solař, Ph.D., Ing. Filip Čmiel, VŠB TU Ostrava
The exact determination of emissivity and the following determination of surface temperature of glossy materials can be carried out e. g. after applying a material with a known value of emissivity on the surface (e. g. self-adhesive foil or spray tint). The contribution deals with other possibility of determination of surface temperature and the influence of emissivity of glossy materials using a metal shield that reduces the negative influence of the reflected radiation during the termographical measurement.
Praha

Prague Building Regulations – The Analysis of the Fundamental Principles of Territorial Requirements

20.10.2014 | Ing. arch. Marek Janatka, Ph.D., Katedra urbanismu a územního plánování Fakulta stavební ČVUT v Praze
Prague building regulations currently represent debated and controversial topic among both professionals and the public. This is a new concept of law to which they are greatly implemented basic knowledge of urban theory and practice. The article summarizes the basic principles of the new regulation in the field of territorial requirements.

How to reveal (during spring and summer seasons) any danger of interior wall mould & condensation on windows that may have develop in wintertime

22.9.2014 | Ing. David Sýkora, Ph.D., VŠB - TU Ostrava, FAST
Hidden defects of buildings, which may become evident only in winter, are one of the biggest problems of any real property purchase. The article gives some advice how to detect them in advance so that the buyer may be prevented from submitting time consuming, expensive and often ineffective claims in face of the previous owner.
3 comments, last 29.09.2014 10:10

Defects and faults of windows, Part 2

1.9.2014 | Ing. Martin Múčka, Ph.D., znalec pro obor Ekonomika a dřevozpracování
This section is a continuation of the four-part article. "Defects and breakdowns construction wall opening" which states the defects in the timber windows which has been a problems for ten years. After further analysis by a team of experts, it was determined that the windows do not have an airtight seal. The problem area is the mounting of the windows which includes the glazing and silicone process.
dřevěná okna

Defects and faults of windows

18.8.2014 | Ing. Martin Múčka, Ph.D., znalec pro obor Ekonomika a dřevozpracování
The article describes the most frequent defects and breakdowns of using timber windows the author experienced for 10 years during his praxis. These problems are divided into the defects of construction arising from production. The defects and breakdowns during the assembly and the defects and breakdowns timber windows have during operation and construction.
3 comments, last 26.08.2014 20:13

Windows installation finally has its own technical standard

2.6.2014 | Richard Čemus, Marketing Manager, Tremco illbruck s.r.o.
Years of speculation about the correct windows installation finally ends. On May 1st the new standard ČSN 74 6077 Windows and external pedestrian doorsets - Requirements for installation came into force. It is the very first implementing standard for this branch of construction. The standard is based on the technical standard information TNI 74 6077 and replaces it.
2 comments, last 13.07.2014 19:25
okno s izolačním trojsklem

EFFECT OF GLASSED SURFACES ON COMFORT CONDITIONS OF INDOOR ENVIRONMENT

5.5.2014 | Ing. Jan Schwarzer, Ph.D., energetický specialista, Ing. Jiří Ježek, Oknotherm s.r.o.
The article deals with the determination of effects of heat radiation on the quality of the indoor environment in winter season, while insulating by double and triple glasses. Effect of radiation through the fillings of the panels and building structures has been evaluated on the basis of knowledge of the mean radiation temperature and operative temperature in the given indoor environment. Isotherms of mean radiation and operative temperatures for different cases of application of insulated glasses having different coefficients of thermal transfer have been presented.
1 comment, 06.05.2014 07:46
Měření svislosti okenního rámu vodováhou

Buying windows and doors, Part 8 - Warranty and Claims

17.2.2014 | Ing. Roman Šubrt, Energy Consulting, Ing. Zdeněk Petrtyl
The 8th part of the series about doors and windows is focused on the process of acceptance of the work including the assessment of defects and unfinished parts, and their removal. It recommends length of warranty periods and claim application.
Stavba železobetonového skeletu s jeřábem

Joint and several liability of construction company and its suppliers according to the new Czech Civil Code

17.2.2014 | Mgr. Mikuláš Vargic, Advokátní kancelář Šikola a partneři, člen konsorcia Frank Bold

New Civil Code enacts special type of solidary obligation to remedy the defects of building constructed under contract for works. All subcontractors (suppliers) of constructor, investor`s technical supervisors or construction project designer are solidary responsible together with the constructor in case the defect can be attributed to the performance they provided. However, these parties need not to be the parties to the contract for works itself (and usually are not) as their obligation arises by law.

The remedies that the investor can claim on these co-debtors, however, are limited to right to demand the repair of the defect. Investor may demand remedy on any of the co-debtors and all the co-debtors are obliged to perform the remedy in full.

The investor has to give notice to the debtor within a reasonable time. The notice can be sent to any of the co-debtors but we advise all investors to give notice always to the constructor first or together with the other co-debtors.

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