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Ventilated Facades - Technical Description

 

Granitech GHV Ventilated Façades


Granitech GHV ventilated façades are based on the integrated system of Granitifiandre fine porcelain stoneware slabs including safety netting, an insulating layer and an aluminium structure.
The structure consists of sections and brackets both made of extruded 6060 aluminium of the 6000 range according to EN 573-3, in physical state T6 according to EN 515.
The extruded sections will be installed vertically by means of suitable L-shaped brackets and will constitute the supports for securing the porcelain stoneware slabs by means of AISI 316 stainless steel plates and hooks. On fixing the uprights to the brackets, care must be taken to ensure that the section is fixed firmly in one place only, leaving it free to move longitudinally through the remaining fixing devices in order to ensure sufficient space to cater for the heat expansion of the aluminium. Safety of the whole system shall be ensured by proper checks in accordance with the applicable standards (Technical Regulations for Buildings - Italian Ministry Decree dated 14.09.05).
Special EPDM gaskets will be sandwiched between the porcelain stoneware slabs of the cladding and the metal structure, so as to avoid noise caused by vibrations.
The GHV system calls for horizontal gaps of 6 mm and vertical gaps varying between 2 and 10 mm approximately between the slabs.


Fixing brackets


The brackets for fixing the vertical sections to the wall of the building will be made by extruding them, after which they will be machined to make holes and slots in them and bent. Specifically, the bending will have the purpose of creating a system of springs for preliminary fixing of the uprights so as to enable optimum mounting of the metal structure.
The brackets will be of two types:

  • Brackets on the joints of the vertical metal structure, able to bear vertical and horizontal forces;

  • Brackets to be positioned between one joint and the next, capable of transferring the horizontal forces coming to bear on the ventilated façade to the wall of the building.

Metal structure


The vertical sections will have a T-shaped cross-section, with an overall width of the flange of 65 mm and a minimum thickness of 2 mm, while the web will be 48 mm long. The surface of the web will have longitudinal ridges (produced by the extrusion process) on it to enable coupling with the fixing brackets, which will have the same ridges on their surfaces. The thickness of the section on the web will in any case be 2 mm.
Coupling of the two surfaces with longitudinal ridges will in any case prevent the component securing the two parts from being subjected to shear stress by forces acting at right-angles to the surface of the ventilated façade (wind and horizontal seismic forces).
The T-shaped sections will be coated with powder paint at least 60 thick according to UNI 10681 and UNI 9983.
The paint will provide additional protection against weathering agents and will also have the purpose of avoiding unattractive reflecting of light in the gaps between the slabs of the cladding.


Plates with hooks


The porcelain stoneware slabs of the cladding will be secured to the aluminium structure by means of stainless steel plates.
The plates will be painted black so as to avoid unattractive reflection of light in the gaps between the slabs of the cladding.
In addition, they will be fitted with removable stainless steel hooks painted in the same colour as the chosen type of porcelain stoneware.
This means that, if required, each hook can be of a different colour so that the appearance is always attractive, even when slabs of porcelain stoneware of different colours are placed next to one another.
The plates with the hooks can be assembled in different ways:

  • with 1 or 2 hooks for the plates at the bottom and at the top of the ventilated façade, and for those on the joints of the uprights;

  • with 4 or 2 hooks for the plates in the central or side areas of the ventilated façade respectively.

High-density polyethylene will be injected between the hooks so as to ensure that the width of the horizontal gap remains constant at 6 mm.


Fixing components and connections

  • The brackets will be secured to the wall of the building by means of suitable stainless steel A4/A2 anchor bolts of the mechanical type or with a chemical anchoring agent.

  • The uprights will be secured in place in way of the brackets by means of aluminium alloy rivets with stainless steel nails. (rivet Al 4,8x12/14).

  • The plates with hooks for fixing the slabs to the metal structure will be secured in place by means of black-painted aluminium alloy rivets with stainless steel nails (rivet 3.2x8/6,5).

Insulating layer


Semi-stiff water-repellent glass-wool panel subjected to special treatments with heat-hardening resins and covered with a film of black glass on one side of the panel so as to create a first barrier against atmospheric agents and to screen the open joint between the slabs.

  • Density = 40 Kg/mc;

  • Heat conductivity = 0,034 W/mK.

Granitech GHS Ventilated Façades


Granitech GHS ventilated façades are based on the integrated system of Granitifiandre fine porcelain stoneware slabs including safety netting, an insulating layer and an aluminium structure.
The structure consists of sections and brackets both made of extruded 6060 aluminium of the 6000 range according to EN 573-3, in physical state T6 according to EN 515.
The extruded sections will be installed vertically by means of suitable L-shaped brackets and will constitute the supports for fixing an additional extruded aluminium section positioned horizontally. The porcelain stoneware slabs will be suspended from the horizontal components by means of suitable accessories for which a truncated cone-shaped hole has to be made in the slabs.
When fixing the uprights to the brackets, care must be taken to ensure that the section is fixed firmly in one place only, leaving it free to move longitudinally through the remaining fixing devices in order to ensure sufficient space to cater for the heat expansion of the aluminium. Safety of the whole system shall be ensured by proper checks in accordance with the applicable standards (Technical Regulations for Buildings Italian Mini- Ministry Decree dated 14.09.05).
Special EPDM gaskets will be sandwiched between the porcelain stoneware slabs of the cladding and the metal structure, so as to avoid noise caused by vibrations.
The GHS system calls for horizontal and vertical gaps varying between 2 and 10 mm approximately.


Fixing brackets


The brackets for fixing the vertical sections to the wall of the building will be made by extruding them and then machined to make holes and slots in them and bent.
Specifically, the bending will have the purpose of creating a system of springs for preliminary fixing of the uprights so as to enable optimum mounting of the metal structure.
The brackets will be of two types:

  • Brackets on the joints of the vertical metal structure able to bear vertical and horizontal forces;

  • Brackets to be positioned between one joint and the next, capable of transferring the horizontal forces coming to bear on the ventilated façade to the wall of the building.

Metal structure


The vertical sections will have a T-shaped cross-section, with an overall width of the flange of 65 mm and a minimum thickness of 2 mm, while the web will be 48 mm long.
The surface of the web will have longitudinal ridges (produced by the extrusion process) on it to enable coupling with the fixing brackets, which will have the same ridges on their surfaces. The thickness of the section on the web will in any case be 2 mm.
Coupling of the two surfaces with longitudinal ridges will in any case prevent the component securing the two parts from being subjected to shear stress by forces acting at right-angles to the surface of the ventilated façade (wind and horizontal seismic forces).
The T-shaped sections will be coated with powder paint at least 60 mm thick according to UNI 10681 and UNI 9983. The paint will provide additional protection against weathering and will also have the purpose of avoiding unattractive reflecting of light in the gaps between the slabs of the cladding.
The horizontal sections will have cross-sections suitably designed to enable the components for fixing the slabs to be wedged into place and will be secured to the vertical profiles by means of rivets. The horizontal sections will be coated with powder paint at least 60 thick according to UNI 10681 and UNI 9983.
The paint will provide additional protection against weathering and will also have the purpose of avoiding unattractive reflecting of light from the gaps between the slabs of the cladding.


Holes and anchor bolts


The porcelain stoneware cladding slabs will be fixed to the horizontal metal structure by means of wedged aluminium clips.
The clips will be fixed to the slabs by means of special AISI 316 stainless steel screw anchors.
These anchors call for truncated cone-shaped holes to be made in the back of the slabs.
Each slab will have four holes and the corresponding four clips, positioned along two parallel lines on the horizontal sides. The two clips of the upper alignment will have adjustment screws to enable the slabs to be positioned perfectly horizontally.
An EPDM gasket will be sandwiched between the clips and the slabs to enable perfect coupling between the two components and so as to avoid noise caused by vibrations.


Fixing components and connections

  • The brackets will be secured to the wall of the building by means of suitable stainless steel A4/A2 bolts of the mechanical type or with a chemical anchoring agent.

  • The uprights will be held firmly in place in way of the brackets by means of aluminium alloy rivets with stainless steel nails (rivet Al 4,8x12/14).

  • The plates with hooks for fixing the slabs to the metal structure will be held firmly in place by means of aluminium alloy rivets painted black with stainless steel nails (rivet 3.2x8/6,5).

Insulating layer


Semi-stiff water-repellent glass-wool panel subjected to special treatments with heat-hardening resins and covered with a film of black glass on one side of the panel so as to create a first barrier against atmospheric agents and to screen the open joint between the slabs.

  • Density = 40 Kg/mc;

  • Heat conductivity = 0,034 W/mK.

Welcome to Granitech

Granitech deals with design and installation of ventilated walls and raised floors. Using state-of-the art technologies Granitech develops top quality solutions for important projects in contemporary architecture.

Ventilated Facades

Ventilated walls are multi-layer construction solutions for "dry" cladding of outside walls, improving their aesthetic qualities, degree of protection and insulation.

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Floating Floors

A raised floor is a flooring systems designed to meet the different needs of working areas with high concentration of plant engineering systems.

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Glossary

Definitions of terms and phrases commonly used in ventilated and raised applications.

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