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Air tightness of building structures and critical details
Vávra, Petr ; Tichomirov,, Vladimír (referee) ; Bečkovský, David (advisor)
In thesis is dealt with problematic of how the value of air permeability may be affected by properties for water vapour diffusion with regard to OSB material There were chosen two main brands of OSB at Czech trade market Two specimens of OSB with different thickness were chosen for each brand. As a first the specimens were tested for air tightness to work out a value of air permeability for each specimen. Afterwords, the testing was conducted for gaining properties of water vapour diffusion on each specimen. As a final assessment was analysed the impact of properties of water vapour diffusion on the air tightness for each specimen. The general meaning of gaining higher air tightness with higher water vapour resistance was proved . It was shown that with raising thickness is usually gotten higher value of water vapour diffusion resistance. However it could not mean getting high air tightness. The crucial parameter is the quality of the material for gaining higher resistance against water vapour diffusion as well as for higher airtightness.
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Porovnání fyzikálních a mechanických vlastností dvojitého okna vyrobeného v roce 1920 se současnými výrobky
Kazimír, Tomáš
This work is focused on the comparison of physical and mechanical properties of the double window from 1920 and with a window made at present days. Based on the re-sults of tests carried out by an authorized research building joinery product in Zlín, these results were compared. Thesis deals with the comparison of construction of both wainscoting double windows. These windows were tested in the laboratory according to the three most im-portant technical requirements that are currently being placed on the windows. It is a test of air permeability, water tightness and resistance to wind loads.
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Změny technických parametrů oken při změně používaného kování
Hanzlík, Miroslav
The aim of the Bachelor thesis is to determine whether when the fittings for simple windows with a given profile and size is changed, there are changes in the technical parameters guaranteed in the certification. When testing there will be used four identical eurowindows, fitted with four types of fittings from brands ROTO, MACO, WINKHAUS and SIGENIA. The windows will be exposed to the test of air permeability, watertightness, weathering and finally again the air permeability. The results of the work prove, that at each change of fittings is necessary to for a re-certification.
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Vliv změny celoobvodového těsnění na technické parametry oken
Hanzlík, Miroslav
The aim of this thesis is to prove a necessity of re-certification after window seal change. A euro window was made and it was used five types of seals. All of this seals were measured on air-permeability and watertigthness. A differences in air-permeability among seals were measured. It was also determined huge impact on watertighness with correct sealing of head flashing with plastic ending. The watertightness is much better when is end of head flashing with plastic ending sealed with silicone sealant. The conclusion is necessity of re-certification of window after seal change. Because this step has significant effect on final watertigthness and air-permeability of window.
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Porovnání technických parametrů dřevěných a plastových vchodových dveří
Čupr, Milan
The main purpose was to compare the parameters of entrance plastic and wooden doors. The doors were measured in the acredited testing laboratory CSI a. s. Zlín for resistence to wind loads, watherproofness and air permeability. The doors were compared on obtained values and then we detected the weaknesses and strenghts of both types. Depending on the weaknesses and strenghts of the door there were evaluated the possible changes in profile thicknesses and seals and could be evaluated the options which could improve the final test parameters. In the end there was found out depence of the quality and the type of materials on the price door´s construction.
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Airtightness estimation of wood based residential houses using Blower-door test
Srba, Jaromír ; Böhm, Martin (advisor) ; Trgala, Kamil (referee)
This dissertation analyses airtightness of residential buildings which in many ways influences their energy performance and therefore also their costs of use. Properly conducted airtightening layer can significantly extend the lifespan of the construction. The main objective of the dissertation is to evaluate the construction of newly built buildings in the Czech Republic and to assess the most important parameters which affect airtightness.
The Blower-door test was used to assess air leakage. This method belongs among the most widely used and conclusive methods of analysis. Its advantage is mainly the fact that it can detect construction defects of the airtightening layer in important stages of construction (and possibly enable these defects to be corrected before completion). The core of this method is to create a pressure difference of deltap 50 Pa between the exterior and the interior of the building and at the same time discover the faulty places which are different for positive and negative pressure.
The air leakage was assessed in 345 residential buildings constructed between 2006 and 2016, especially in conventional wood frame buildings or with buildings made from wood panels such as cross-laminated timber. The development of values of air change rate through the building envelope was evaluated according to the Czech standard ČSN 73 0540-2 and the results were compared to previous outcomes of other authors. Analysis and photo documentation of the most frequently detected leakage points are also part of the dissertation. A significant decrease in values of the air change rate was discovered, on average by 40.49% in 2016 compared to 2006, while for passive houses the air change rate values were almost steady. For buildings with wood frame construction, it was the way of ventilation which was determined as the most significant parameter affecting air leakage. For wooden buildings with natural or combined ventilation, the average value of air change rate at the pressure difference of 50 Pa was 1,29 h-1, for buildings with mechanical ventilation and heat recovery it was 1,18 h-1 and for buildings with very low energy consumption for heating with mechanical ventilation and heat recovery it was 0,44 h-1. Other parameters affecting the values of air leakage include the construction company, the presence of a chimney, the place and method of construction of the wood frame construction.
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Air tightness of building structures and critical details
Vávra, Petr ; Tichomirov,, Vladimír (referee) ; Bečkovský, David (advisor)
In thesis is dealt with problematic of how the value of air permeability may be affected by properties for water vapour diffusion with regard to OSB material There were chosen two main brands of OSB at Czech trade market Two specimens of OSB with different thickness were chosen for each brand. As a first the specimens were tested for air tightness to work out a value of air permeability for each specimen. Afterwords, the testing was conducted for gaining properties of water vapour diffusion on each specimen. As a final assessment was analysed the impact of properties of water vapour diffusion on the air tightness for each specimen. The general meaning of gaining higher air tightness with higher water vapour resistance was proved . It was shown that with raising thickness is usually gotten higher value of water vapour diffusion resistance. However it could not mean getting high air tightness. The crucial parameter is the quality of the material for gaining higher resistance against water vapour diffusion as well as for higher airtightness.
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