That they are staircases of interior or external accesses, whether they are right or out of snail: each Bürkle staircase is adapted to fulfill the requirements of your individual request, that it is the height of the steps, the width of emmarchement or the height of the starting step and the landing step. It convaint by the precision of fitting just like by a surface of facing smoothes formwork and without too many porosities. A special soundproofing makes it possible to obtain a high protector of noise of impact.