Ventilated facade invisible solution
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.
The horizontal cross section shows all components of the system. The thickness of a hard or soft insulation can vary up to 140 mm, so as the dimension of ventilation cavity of recommended minimum 30 mm can vary, based on its calculated performance.
In the vertical section, the use of the brackets can be easily identified by their different dimensions. The 150 mm main bracket is of structural use and guarantees a fix point to control the linear dilatation and represents a hinge and a joint for the mullions. The smaller 80 mm bracket has a static task and allows the relative sliding between bracket and mullion. The distance between brackets and their quantity is calculated according to the static system requirements.
This is one of the main points of the system. This is the principal AIR inlet of the façade, and, if the system is well designed from the technical and fluid dynamic point of view, the AIR from here goes up to the top of the façade with laminar motion. A grid or a pierced sheet, or an aluminum profile (included in our accessories range) must be placed to allow the external AIR to pass in the ventilation space according to the calculations.
The head detail ia another important point of the façade system. This is the outlet of the exhaust AIR coming up from the ventilation space and it must have two different roles: on the one hand, it has to protect the façade from the outside water thus granting the rain drainage, on the other hand, it has to allow the AIR outlet, without any AIR vortex or warm AIR stagnation.
The outer corner is one of the flagships of the GammaStone AIR façade system. The panels are cut at 45 ° in the factory and can be fixed at each other with the appropriate brackets in the back stainless steel sheet to give the elements of the façade a “monolithic” appearance, ie without vertical escape. Otherwise, one can determine the architectural joint by project and maintain it during assembly. In both cases, thanks to the locking of the panels, the stability in time of the joint is fully guaranteed.
Even this detail can be designed in detail. As in the case of the outer corner, the panels are fastened to each other to ensure the duration in time of the assembly and to confer the architectural aspect that most suits the designer, starting from a 0 mm joint.
The intrados side is a detail that gives personality to the building. In the version with concealed fixing with GammaStone AIR panel, the edge at 45 ° is realized with extreme precision, and the panels fixed together by rear brackets. The final aspect is that of a monolithic block, solid and clean at the same time.
The version with intrados in metal sheet, highlights much more the presence of the windows. In this case, the technique choice involves a great accuracy in the realization of the panels, which must include the compensation profiles for expansions and manufacturing tolerances of the building.
The sill plays a fundamental role in the frame of the windows, since the role of rainwater drainage is delegated to this detail. The version in GammaStone AIR imparts a monolithic appearance to the final system, and must ensure, thanks to the constructive system and seals, no infiltrations of water that can impregnate the insulation.
The metal sheet sill can be designed to ensure the evacuation of the ventilation AIR coming from the bottom, in addition to ensure the drainage of rainwater. The node must be designed so as not to allow water to enter from the outside, but at the same time to allow a convenient AIR expulsion.
The ceiling plays a decisive role, both from the architectural and fluid dynamic point of view. In addition to being a part of the window frame, is the other main entry point for the outside AIR. It is possible to achieve this effect even with the version made with panels GammaStone AIR.
The ceiling made of metal sheet has an important architectural impact on the building. To ensure proper functioning of the thermal/fluid dynamic machine that is a ventilated façade, the sheet must be perforated so as to allow the entrance of the external AIR in agreement with the calculations.