Building a concrete staircase needs to go through a casing, in other words to develop the space between two different heights. To do this, the necessary materials are first strong planks and moisture resistant, wedges, irons assembled together to form a robust mesh and, of course, concrete. The formwork of a concrete staircase proceeds in several steps, which you will be described in turn below.

Formwork

Beforehand, ask silt on the wall for support. Draw them discreetly in pencil the embattled steps. Then screw in the horizontal battens on the stringers. With the help of cleats you will then be able to fix the risers. The important during this stage is to make sure to keep a distance of 10 cm between the bottom of the first plate and the ground. Now, this is to set up the boards. Start with the first, the bottom, then climb gradually, keeping in mind the spacing of 10 cm between the lower end of the plank and the ground. Once laid the boards, it’s time to have the net, or mesh, in chains, the latter is inserted by slipping between the boards and the floor. Between the lattice and the ground, interpose shims (you may use falling blocks or small pieces of concrete) to prevent the iron lattice touches the ground during the next phase of formwork.

Pouring concrete

For the assay, it takes about 350 kilos per cubic meter of concrete, or, for a volume of cement, count two and three sandy gravel. The casting has him in two separate stages: first, the casting of a dry concrete, and that of a layer more fluid. Thus, first, a place which is called “ruin the concrete.” Start at the bottom of the stairs, the bottom of the formwork to be taken by a bed of dry concrete. This phase should be conducted so patiently to prevent rapid curing of the concrete, it must “pull” between each step.

Then comes the phase where the concrete has to “vibrate” (you’ll understand that the formwork is a veritable ode to concrete). Concrete and it becomes much less sentimental all of a sudden, it’s a slap on the boards with a hammer to spread the concrete evenly in all the gaps. You can also move the concrete with a trowel. Third comes the second layer of concrete, much more fluid this time. The steps are to complete. Finally, using a trowel, smooth the surface of the steps.

Stripping

No formwork without stripping, while here we are! This final stage usually occurs a week after the formwork for a staircase and the next day for an outdoor staircase.

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