We commissioned a firm of structural engineers, with specific experience of fabric structures, to calculate and produce a full set of engineered calculations. They underpin our Stratus and Cirrus tents, covering every approved link, and every combination of sides up and sides down, with TipiStarTM fitted and without. The calculations consider the specific components of our Nordic tipis and use the results of laboratory testing of our timber, fabrics and sewing techniques. These incredibly detailed calculations allow us to confidently assess the safe conditions in which our Nordic tipis can be used and helps our customers to obtain permits and approval from regulatory authorities.