Useful Information

Aluminium Window Frames/Accessories

The main function of an aluminium window frame system is to ensure the efficient closing of a space, to create visual harmony, illuminate and ventilate buildings, ensure safety conditions and the comfort of its users. It is comprised by aluminium profiles and related accessories. Nortalu, markets a full line of high quality and performance accessories. The recommended accessories were developed in order to allow correct operation of its systems.


Installation at work site - maintenance and conservation

The window frame should be installed whenever the civil construction works are concluded in order to avoid contact with corrosive materials.
The attachment of the frames should be performed using stainless steel screws and bushings of non-oxidizing material. The seal between the frames and the walls should be ensured by applying sealing products of proven quality.
All of the aluminium should be cleaned in order to maintain its surface in good condition. For that purpose, a soft cloth moistened in water will suffice. If necessary, a neutral product can be used, diluted in water with pH between 5 and 8, at a concentration of approximately 5% of the volume. No brushes, sandpaper, scouring pads or any other kind of abrasive material should not be used, neither solvent based cleaning products (detergents, window-cleaners, paint thinners, among others


Packaging and Transportation


Good conditioning of the profiles is essential to prevent warping and scratches to the material during transport. The packaging, in many cases, is customized, according to the customer's requirements or that of the profile itself. The various types of packaging include the simple application of paper between the profiles, protection with adhesive film or packaging in wooden pallets. After reception of the material by the client, it should be stored indoors, at a location free of humidity or dirt.


Construction System – Aluminium window frame / Glass


Selection of the Window Frame
Our goal is introducing tested systems, with quality and safety assurance recognized by European Community Directives. The selection of a window frame system should take into consideration some important aspects that can condition that choice. In order to ensure the characterization of the various available systems, three parameters were defined:

Air permeability (EN 1026)
Is the ability of a window frame system to prevent the air from passing when it is closed and subjected to different pressures.

Water tightness (EN 1027)
Defines the ability of a window frame system, when closed, to oppose the infiltration of water.

Wind resistance (EN 12210)
Is the characteristic that indicates the safety level the system ensures its users. The system is subjected to a series of pressures and depressions in order to allow measuring the deformation of the profiles. In thermal bridge break systems we also test their acoustic and thermal insulation.


According to the European normative in effect the systems are classified according to the results obtained in test bench:

Minimum Maximum
Air permeability Class 1 Class 4
Water tightness Class 1A Exxxx
Wind resistance Class 1 Exxxx

Acoustic Insulation
In order to ensure good performance, we should choose a system with good air tightness.

Thermal Insulation
If what we are looking for is good thermal insulation, we should look for a system with a thermal break.
Selection of a window frame also depends of the wind's dynamic pressure acting over the frame, the installation site and the height of the building and the aerodynamic ruggedness of the terrain.

Portugal is, therefore, divided into two large areas:
Area A: Almost the entire national territory, except the regions belonging to area B;
Area B: The Azores and Madeira and the continental regions located in areas with altitude above 600m and a strip of coastline with 5Km in width.

Ruggedness can be divided into three types:
Type I: Inside urban areas with mid to large size buildings;
Type II: Periphery of urban areas and rural areas;
Type III: Areas close to cliffs or valleys.

Once all these parameters have been defined, it is possible to calculate the dynamic pressure of the wind acting over the window frames.
After selection of the window frame system, we should take into consideration the glass to be used, since in the majority of cases the largest surface of a window is glass.
There are several types of glass with different compositions that allow adjusting to most varied requirements and to optimize the performance of the window frame. Its characteristics can still be improved with the introduction of resins or films, with specific characteristics for the following cases:
• Solar Control
• Thermal Control
• Acoustic Control
• Safety
• Energy
• Luminosity

In the current context of energy legislation, selection of the frame+glass group assumes greater relevance for an ideal classification of the building

Solar Control (Low Emission)
In order to ensure greater energy savings, the amount of energy passing through the glass to the inside of the building should be reduced.

Acoustic Insulation
Should we wish to obtain good acoustic insulation, we have to take into consideration that, besides the choice of a glass with these characteristics, the glass panes should have different thickness and the larger this difference the better the insulation.

Seals
The choice of sealant type is crucial for its durability, allowing the maintenance of its main characteristics throughout time, without showing signs of ageing or deterioration. One of the most important aspects in the operation and behaviour of the window frames is related to the sealants.
The quality of the sealants to be used in their construction is vital in order to ensure perfect air tightness.

Air Tightness and Drainage
For good air tightness and drainage of the window frames it is necessary to proceed to good sealing of all joints and connections between profiles.
Drainage slots should be provided in lower horizontal profiles, avoiding the appearance of condensation and small infiltrations inside the profiles.
In order to avoid the risk of reflux caused by the wind, the external slots should be protection by gutters that allow drainage of the water and prevent the entry of wind.

Assembly of window frames / glass
When assembling the window frames it is necessary to always take into consideration that the connection between profiles and the union of joints should be done with quality accessories of proven quality and stainless steel screws.
The joints and connections of profiles should be accurately sealed with silicone or appropriate glues.
Placement of the glass should be in accordance with the technical specifications indicated by the supplier of the glass, always supported by shims in order to avoid direct contact of the glass with the frame and to ensure correct positioning. It should be applied with the appropriate sealants to ensure proper air tightness.