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Paver base is a form of aggregate used in the construction of patios and walkways whose topmost layer consists of mortarless (or "dry-laid") pavers. The first layer in the construction of such a surface is called the subgrade —this is the layer of native material underneath the intended surface.
Patios are most commonly paved with concrete or stone slabs (also known as paving flags). They can also be created using bricks, block paving, tiles, cobbles or gravel. Other kinds of patio materials these days include alumawood, aluminum, acrylic and glass. Other options include concrete, stamped concrete, and aggregate concrete.
A concrete slab is a common structural element of modern buildings, consisting of a flat, horizontal surface made of cast concrete. Steel- reinforced slabs, typically between 100 and 500 mm thick, are most often used to construct floors and ceilings, while thinner mud slabs may be used for exterior paving ( see below ).
Umbrella bag dispenser in front of the entrance. An umbrella bag in use. A more recent variant of the umbrella stand used in modern retailers is the umbrella bag dispenser, which allows the user to insert the umbrella into a disposable waterproof bag when entering a building, and to carry that bag with them so as not to get the floors wet.
A structural support is a part of a building or structure that provides the necessary stiffness and strength in order to resist the internal forces (vertical forces of gravity and lateral forces due to wind and earthquakes) and guide them safely to the ground.