The above-ground part of the building is mostly constituted by the walls. Taking into consideration their surface, not solely their thickness is of big significance – support for the roof structure, but also insulating features – protection against changing weather circumstances and huge temperature losses.
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This last characteristic is particularly important in our climate zone.
A significant task in which architects must succeed is the selection of an optimal technical solution for the external wall insulation. In numerous cases, economic short-sightedness prevails and the compromise is made to use single-layer wall technology without insulation. In the multiple-layer wall purposes are split among two or even three components. One has solely (or primarily) structural function, the other has a simply insulating function, and possibly also another material of protective and decorative purpose. Therefore, thermal insulation depends predominantly on the depth of the insulating material layer. Smaller or greater thickness of this layer does not change the structure of the surface (of the other layers) or the expense for its construction.
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The modification in thermal insulation features interests only the price of insulation and influences the cost of the entire structure to a small extent.
Determining the most economically efficient depth of the thermic insulation layer in agreement with the principle of the shortest payback period or the lowest expenses for the long-term use cycle should be the starting point for the financier to reach an accord on the selection of wall composition and thickness of the thermal insulating material.