Abstract
CLT buildings - a critical view concerning airtightness and weather protection during building time. Wood constructions are gaining a bigger and bigger share in the building industry as well in bigger constructions. Mainly CLT (Cross-Laminated-Timber) elements are due to it’s stability, fast building up time, easy installation and high share of prefabrication a key point for this success. In this presentation I will take a critical view on the building physical properties like diffusion resistance and airtightness. Especially according to the normal building material properties of wood like swelling and dwindling of timber. As well we will take a closer look to different glue technologies which are used on adhesive tapes to seal the CLT elements airtight. There are different technologies available in the market which offer different quality levels. Another point to solve is the temporary weather protection of timber building due to an enlarged building time. Especially when we have visible surface in the walls or in the ceiling they must be protected against rain water – there are new self sticking membranes available in the market which have proven their ability to protect ceilings against rain in a large number of realised constructions. The performance of these products will be presented in some already realised projects and we will take a closer look at the requirements and problems which have been found in these projects.
Highlights
Building regulations, standards and an understanding of construction-physics processes all call for airtight buildings, and there is a good reason for this: the airtightness layer helps to save energy and avoid damage to structures, and provides good heat protection in summer
As well we will take a closer look to different glue technologies which are used on adhesive tapes to seal the CLT elements airtight
Standards and an understanding of construction-physics processes all call for airtight buildings, and there is a good reason for this: the airtightness layer helps to save energy and avoid damage to structures, and provides good heat protection in summer
Summary
Standards and an understanding of construction-physics processes all call for airtight buildings, and there is a good reason for this: the airtightness layer helps to save energy and avoid damage to structures, and provides good heat protection in summer. The temperature difference between these two climate areas tries to even itself out by means of air flow, known as convection. This involves warm air from inside the building exiting through the structure into the exterior in wintertime. It helps to ensure that mould and damage to building structures due to condensation are avoided, and provides for a pleasant indoor climate in summertime. Almost five times more heat is lost compared to the airtight structure
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