Eurotec Catalog: Wooden Decks Page 13
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TAKE WIND SUCTION INTO ACCOUNT To build a roof terrace, it is vital to take wind forces into account when planning the terrace design. Wind forces have a varying impact on the terrace, depending on the building height, shape and location, and they determine the amount of wind suction that occurs. Accordingly, the terrace needs to be secured against wind suction to prevent it from lifting off or sliding. Wind suction Wind suction is a wind load arising from the flow of wind. It acts on surfaces, which means that all external parts of a building need to be taken into account. Wind suction occurs as the result of pressure differences between the air blowing past and the air inside or underneath parts of the building. As the pressure of the air that blows past is lower than the air of the building elements, air is pulled out of the building parts. The air flowing out of the building parts exerts pressure on these parts, so failing to take wind suction into account from the outset can result in damage being caused. To give a terrace structure optimum protection from environment influences such as strong wind, the structure should be sufficiently weighed down. To achieve this, concrete slabs are installed in the substructure with our load brackets. The number of slabs needed varies depending on the location of the terrace. Terraces protected from the wind by buildings require fewer slabs than a roof terrace on a multi-storey building, for example. Along the edges in particular, sufficient additional slabs should be installed to ensure that undesired warpage of the structure caused by external influences is minimised. Terrace warpage (extreme example) 13
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