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Above, the surface. Below, the system.

A flat roof becomes a usable terrace when the walking surface stays perfectly level and everything that makes it work finds its place beneath it. That is exactly what this detail shows: large-format porcelain stoneware slabs laid on Pedestal supports, above the waterproofing membrane, with the building services running through the cavity below.
The adjustable supports take up the falls of the substrate and give back a level floor, while underneath the slope keeps guiding water to drainage. Between the membrane and the slabs, a technical void takes shape — housing cables, conduits and pipework for electrical, water, irrigation and lighting systems, all kept tidy, protected and reachable at any time. Aluminium profiles reinforce the edges and distribute loads, for a solid surface even with large formats.
It is a system that works on several levels:

Levelling. Support height adjusts to compensate for falls and achieve a perfectly horizontal walking surface.
Inspectable technical void. The cavity accommodates services and pipework, which stay protected and accessible for maintenance and future work.
Ventilation and drainage. Water drains through the joints and across the membrane, air circulates beneath the slabs: the surface stays dry and stable.
Dry-laid and reversible. Each slab lifts and repositions with ease, to inspect the membrane or upgrade the services; at end of life, components are recovered and reused.
Protection of the waterproofing. The floor floats above the membrane and shields it from solar radiation, foot traffic and thermal shock, extending its life.

What you walk on is the surface. What makes it possible, and makes it last, is the system beneath. This is where we provide support: to those who design and those who install.