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1. Back ventilation 
Ventilation of cold façade cavity to eliminate moisture. 
2. Cold façade 
Curtain wall construction with cavity provided with outside 
air ventilation and inside thermal insulation and sealing. 
3. Coping 
A component which protects the top of the curtain walling 
and the roof edge from weather. 
4. Cradle guide 
A specially profiled continuous recess or projection 
designed into or separately attached to the mullion to 
provide a location guide for an access cradle. 
5. Curtain walling 
External building facade produced with framing made 
mainly of metal, timber or PVC-U, usually consisting of 
vertical and horizontal structural members, connected 
together and anchored to the supporting structure of the 
building, which provides, by itself or in conjunction with 
the building construction, all the normal functions of an 
external wall, but does not contribute to the load bearing 
characteristics of the building structure. 
6. Double skin façade 
A curtain wall construction comprising an outer skin of 
glass and an inner wall constructed as a curtain wall that 
together with the outer skin provide the full function of a 
7. Drainage hole 
An opening through which water drains to the building 
8. External glazing gasket 
A preformed resilient profiled length of sealing material 
installed between the external face of a glass pane, IGU or 
infill panel and the surrounding frame, glazing bead or 
pressure plate. 
9. Glazing bead 
A length of profiled material used around the periphery of 
a pane of glass, IGU or infill panel to secure it in its frame. 
10. Head 
A horizontal structural framing member positioned at the 
top of the curtain wall or at the top of an area of glass, 
windows, panels or doors. 
11. Infill panel 
A translucent or opaque filler or facing material, either of 
one piece or an assembly, installed within a 

12. Insulating glass unit (IGU) 
A composite unit of two or more panes of glazing 
hermetically sealed to provide an improved performance 
of thermal and acoustic insulation. 
13. Internal glazing gasket 
A preformed resilient shaped length of sealing material 
installed between the internal face of a glass pane, IGU or 
infill panel and its surrounding frame or glazing bead. 
14. Jamb 
A vertical structural framing member positioned at the 
vertical edge of the curtain wall. 
15. Movement joint 
Joint to take up thermal or other movements arising from 
the curtain wall or the supporting structure. 
16. Mullion 
A vertical structural framing member of a curtain wall. 
17. Mullion cover cap 
A profiled external cover applied, usually snap fitted, over 
the face of the mullion pressure plate to provide an 
architectural finish. 
18. Perimeter seal 
A joint between the curtain wall and adjacent construction 
designed to give continuity at both the air and water 
barriers of the wall. 
19. Pressure equalisation 
A method of sealing and compartmenting the wall which 
enables the rapid minimisation of differential air pressure 
between cold façade cavities or glazing rebates and the 
external air. 
20. Pressure plate 
A length of profiled material applied around the perimeter 
of a pane of glass, IGU or infill panel to provide structural 
restraint and compress the glazing gasket. 
21. Setting block 
A small block of suitable material, placed under the lower 
edge of a pane of glass, IGU or infill panel when setting it 
in a frame. 
22. Shear block 
A profiled connector shaped for installation within the 
hollow profile of a transom for structural connection to a 
23. Sill 
A horizontal framing member positioned at the base of an 
area of glass, windows, panels or doors.




24. Spandrel area 
The area of a curtain wall between two horizontal zones, 
normally between glazing and concealing the edge of the 
floor slab. 
25. Spandrel panel 
Panel within the spandrel area. 
26. Spigot 
A profiled structural connecting piece shaped for 
installation within the hollow profile of a framing member. 
27. Stick construction 
A carrier framework of site assembled components 
supporting glass, IGUs and infill panels. 
28. Structural fixing bracket 
An assembly of structural components designed to 
transmit all actions on the curtain wall back to the building 
structure while allowing any required movement. 
29. Structural sealant glazed system 
A means of bonding the glass units onto an internal frame 
with minimal mechanical retention, to provide a flush 
glazed wall. 
30. Thermal break 
An element of low thermal conductivity incorporated into 
an assembly to reduce the flow of heat between more 
conductive materials. 
31. Transom 
A horizontal structural framing member of a curtain wall. 
32. Transom cover cap 
A profiled external cover applied, usually snap fitted, over 
the face of the transom pressure plate to provide an 
architectural finish. 
33. Unitised construction 
Pre-assembled, interlinking, storey height or multi-storey 
height façade modules, complete with infill panels. 
34. Vapour control layer 
The layer comprising a material or coating with greater 
resistance to vapour transmission than the other layers of 
the wall and designed to control vapour movement 
through the wall. 
35. Warm façade 
Curtain wall construction whose outer shell is thermally 
insulated and sealed against outside air.

Energy absorption

Energy absorption is theenergy valueabsorbed by the glazing that causes it to heat by transforming the radiation energy into thermal energy. Absorption is the thirdenergy value inthe transmittance of radiation through glass. Transmission + Reflection + Absorption = 100%

Silver (silver coating).

Silver coating enables neutral-colored thermal glazing tobe produced. INTERPANEfirst introduced this type of glazing on the market at the start of the 80s. At present, silver-coated insulation glass is the benchmark technical standard. The coating

system patented by INTERPANE enables thermal neutral coating with low emissivity (ε

n = 0.03) tobe produced - anUg of 1.1 W/(m²K) - in accordance with the recommendations of EN 673 in standard insulation glass units filled with argon gas.

Solar energy (use of solar energy)

Glass is the only building material that uses solar energy free of charge. Regulations relating to

thermal insulation have taken this element into account by introducing the value Ueg. However,

solar radiation is least present when it is most required, that is in the evening, spring, autumn

and winter months. Therefore, the thermal insulation of the glass (value Ug) is highly significant. In fact, a reduced Ug value means costreduction of expensive heating; however an excessively high g value results in an overheated room in summer.

 Solar factor (g), acc. EN 410/Solar Heat Gain Coefficient (SHGC)

The solar factor (g) is the total energy transmittance of sun radiation through glassfor a wavelengthrange of 300 nm to 2500 nm. This value, expressed as a percentage, is important for temperature calculations. The solar factor (g) is composed of the direct transmittance of solar energy and of secondary interior heat loss, following long wavelength radiation and convection. The solar factor (g) (total energy transmittance)  is calculated according to the EN 410 standard (European Union).  The solar heat gain coefficient (SHGC) is calculated

according to the NFRC standard (US-based National Fenestration Rating Council). These two values, given the different solar spectra used to calculate them, may diverge slightly. The

products themselves are identical. Color rendering index: Ra The color rendering properties of glazing are determined by the general Ra color-rendering index, in accordance with the prescriptions of  EN 410. The scale of the Ra index rises to 100. The optimal Ra value with glazing is 99. The Ra,D value differentiates colors seen in daylightin a roomfrom those seen through a transparent body.

Equally, the Ra,R value describes the color rendering of glass in reflection.

Re, energy reflectance

Quantity of energy reflected by the glass.

Tv (Light transmittance-visible)  

The Tv light transmittance expresses the visible part of the radiation of the visible light - which

wavelength is between 380 nm and 780 nm - passing directly through the glass in relation to the sensitivity of the human eye to light. Light transmittance is expressed as a percentage and

depends on the thickness of the glass. Uncoated insulating glass composed of two panes of float

glass has a light transmittance of approximately 80%. The 100% reference value corresponds to

an opening without any glazing.

Multifunction insulating glass

 Using various base products and fillings with special gases, it is now easy to produce multifunction glazing adapted to specific individual requirements. Therefore, no “stand ard multifunction glass” exists, as the range of products includes a wide range of basic functions, such as:thermal insulation, solar protection, safety, sound proofing insulation, burglar protection, design, etc.

Warm edge spacer its (INTERPANE THERMO-SYSTEM)

The new spacer systems for double glazing are

now produced in stainless steel or plastic instead of the traditional aluminium. These spacer systems offer improved insu lation thanks to “warmedge” technology and are assembled laterally using a primary butyl sealant; the sealant used for the secondary peripheral filling can be polysulphide

or polyurethane.

Silicon Structural Glazing

Sealed external glazing units offer the aesthetic advantage of masking the structure of the frame or curtain walls. The glazing is sealed using hightech materials (silicon). This type of insulating  glazing can be selected from the range of softcoated glazing. In such cases, the vents can open in Italian-style.

Bolted glass

Glazing units are constructively attached by a point fixed system. Soft-coated insulating glazing is available in this system.

 Screen printed glass

Screen printed glass can be combined with soft-coated glass.

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