Ventilated facade

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Rignano Flaminio, Italy
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Ventilated facade

GammaStone AIR is the most important technological challenge in the international industry of VENTILATED FAÇADES and is the result of huge R&D investments together with the skilled work of expert teams of Architects, engineers, and designers. Our team works continuously for the improvement of innovative and revolutionary building systems with the aim of harmonizing the aesthetic charm with the best results from the technical and functional point of view.
GammaStone AIR is an advanced eco-sustainable system able to satisfy the most ambitious and modern stylistic trends of architecture. It also optimize the functional requirements, the practicality and the comfort of living. Our ventilated façades, resulted from an intense research process, are an answer to the widespread need of efficient thermal and acoustic isolation for homes, work environments, etc., with structures and materials that, at the same time, guarantee unalterable aesthetic beauty.
GammaStone AIR is an excellent and unmatched cladding material; it is today the most suitable material available in the international market referring to ventilated façades.
This innovative paneling system for ventilated façades was developed in collaboration with the largest and most reliable companies in the sector. Together with our partners we reached top results referring to insulation, protection from weather events and from external noises.
The GammaStone AIR panels allow easy installation, versatility in architectural design, original stylistic solutions with a wide choice of large-sized marble, granite, porcelain slabs and stoneworks. GammaStone Structurally speaking, GammaStone AIR ventilated façades are really reliable. Our panels undergo stricht tests against wind, compression, hurricanes, etc. They are installed on a metal hanging structure fixed to the wall of the building with layers of insulation and protection materials are assembled within.
The function of the external panels is to protect and insulate and to create a gap between external environment and the structural wall of the building.

Further info from manufacturer on GAMMASTONE AIR
Further details
The suspension and the fixing devices of the metal structure are dimensioned so that an empty space between the insulating layer and the outer panel is created. This is an air chamber connected to the outside by air vents that are usually placed at the base and at the top of the façade creating a continuous ventilation effect in the gap. It is also called “chimney effect” due to the difference in temperature between the air in the ventilation chamber and the outside air. Air enters the gap from the bottom and moves upwards, thus creating an efficient airflow that maximize the transpiration of the façade. This ventilation allows the rapid elimination of aqueous vapours from the inside. Moreover it considerably reduces the condensation and the negative effects of any penetrations of water. This led consequently to the reduction of the quantity of heat that enters or exits from the building.
Ventilated facade invisible solution
The GammaStone AIR Ventilated System with mechanically fixed concealed hangers offers maximum design and highest safety.
This system eliminates any visible fixing device on the panel surface, which results in a clean façade with the smallest joint possible. At the same time it guarantees the highest safety as the system is certified to resist negative wind loads over 450 kg/sqm.

The system is composed by T shaped vertical mullions in aluminum fixed to the wall by two kind of special adjustable brackets: a structural one, 150mm high, to be put on the building slab at each floor, and the intermediate ones 80 mm high.
The first ones are designed to carry the vertical loads given by the own weight of the façade and to react to the horizontal loads, which means wind pressure and depression and act as a dilatation joint for the mullions.
The second ones are trolleys for the linear dilatation of the mullions, and they also bear the horizontal loads.
Between the basement and and the GammaStone AIR panel, a rigid or soft insulation panel can be put, up to 140 mm of thickness. The brackets’ length must be calculated.
Horizontal transoms are fixed on the vertical mullions to receive the concealed hangers of the GammaStone AIR panel. The quantity of mullions, transoms, brackets and hangers is determined by the requirements of the desired energetic and static performance of the final façade.
Dynamic thermal-fluid calculations determine the cavity between thermal insulation and façade panel, where the AIR circulates to keep the wall dry.

The particularity of the concealed cladding system are the narrow joints of 5mm between the panels, which results in an undisturbed aesthetic continuity of the façade in absence of any superfluous interference.
Technically, to hook the panel on the horizontal transom, the hangers are firmly fixed to the panel with rivets on the stainless steel sheet on the backside.
The perfect alignment of the panel is guaranteed vertically by adjustable screws and horizontally by a selfdrilling screw which fixes the position to control the linear dilatation.
Ventilated facade visible fixing solution
The ventilated façade system with visible fastenings provides the “smartest” solution proposed by GammaStone. In fact it offers an extreme rapidity in the assembly, both of the substructure that of the panel itself, and thanks to the possibility of painting the rivets in the same color as the panel, the intrusion of metallic parts are minimized.
The resistance to mechanical loads acting on the facade is the second master point of the system with visible fastenings: thanks to the overlap surface offered by the head of the rivets, the strenght of the panel is also guaranteed for important loads.
The relative thermal expansion between the panel and the substructure is managed by appropriat

The system is composed exclusively by a vertical warping, which guarantees a faster assembly than other systems. In particular, vertical aluminum T profiles fixed to the outer wall of the building by adjustable brackets of two types are used: a structural type, 150 mm high, to be placed on the slab in correspondence of the floors, and the other intermediate, 80 mm high.
The first to bear the vertical load given by the weight of the facade and contrast the horizontal loads given by the pressure and depression of the wind, the second ones play the role of trolleys for the linear expansion of the materials, also contrasting horizontal loads.
Between the GammaStone AIR panel and the wall a panel of insulating material of both rigid and soft kind up to 140 mm in thickness may be positioned.
The length of the connection brackets must be chosen according to this dimension. The exterior GammaStone AIR panel is attached directly to the uprights by means of rivets from the outside. The plate may be perforated in work with specific tips.
Based on the static requirements and energy performance that the facade will need to meet, the number of posts, brackets and rivets will be sized.
The cavity for AIR ventilation formed between the insulating material and panel GammaStone AIR will also dimensioned in function of the thermofluid-dynamic calculations of the façade.

Ventilated façades with visible fastening grant a precise positioning of the panels with a joint of 5 mm between each other, and the minimal presence of metal fastening elements, painted in the same color of the panel, allows the aesthetic continuity of the ventilated façade with almost imperceptible intrusions.
The panels can be pre-drilled in the factory, or drilled on site with special tools.
Fixing is carried out from outside after leveling the panel. It is a good practice to always place a rivet in the middle of the panel to control its deformation and to ensure the relative movement due to thermal expansion of materials by sufficient tolerance between the hole and the diameter of the rivet.

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