Abstract
Alternative solutions to joints of outer wooden solid log walls are based on the current situation on the construction market, which reflects general change in attitude towards the environment. Apart from the evaluation of materials and products in accordance with technological and economic aspects, attention is paid to the effect of individual elements on the environment. This trend is reflected in construction practice by a comeback to original materials and expanding designs of residential buildings on the basis of easily renewable material resources, e.g. wood, which is relatively easily available and renewable construction material. When designing and constructing wooden buildings, it is necessary to take into account specific properties of wood (particularly volume changes), which need to be considered for solutions of individual details. Bed joints of wooden solid log walls are still a problematic detail in terms of thermal technology. It is a contact of two horizontal construction elements – beams, where maximum weakening of the wall thickness occurs. This spot is a relatively frequent place of a recurring thermal bridge during the wall construction. Analysis and improvement of this critical place of wooden houses, which has been more and more frequently built in the Czech Republic, would lead to their better evaluation in terms of heat-technical properties. The aim of the project was to design and examine adjusted variants of shape solutions of joints in between individual solid wooden elements. The project particularly focused on monitoring of surface temperatures in the areas of critical details – bed joints.
Highlights
The paper considers a Canadian type wooden solid log wall in terms of thermal technology, while the main goal is to compare variants of design solutions of such wall
The log wall was built with mineral wool insulation applied in bed joints with the profile type 1 (Fig. 3)
The theory part of the project was performed with the use of a computing program ANSYS, in which 7 shape variants of the bed joint profile of the log wall were modelled
Summary
The paper considers a Canadian type wooden solid log wall in terms of thermal technology, while the main goal is to compare variants of design solutions of such wall. Due to weakening in the area of bed joints and the heat conductivity coefficient of wood, a solid wooden wall hardly meets current strict requirements of the standard ČSN 73 0540-2 [1] for thermal transmittance value U. It was the surface temperature, which is one of the evaluation factors of structure quality, which was monitored
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