WOODEN WINDOWS

WINDOWS WITH STRUCTURAL GLAZING

A structural glazing window stands out with its unique feature – external planes are made completely of tempered glass.
Two insulated glass units where the external tempered glass is larger than two internal ones (insulated glass unit with an “overlap”) are glued with bi-component glue into the profile of especially created frame or leaf profile so that this painted “overlap” covers up the wooden structure.

  • Construction depth of the window (wooden frame with glued-on glass) is 89mm, total thickness of the leaf and glass is 104mm. This structure essentially improves window’s sound insulation and thermal factor, as well as increases anti-burglary function.
  • Window’s thermal conductivity coefficient UW=0,78 W/m2*K (calculated according to DIN EN ISO 10077-1 for a window that can be opened is 1.23 x 1.48m).
  • Sound insulation with standard 56mm insulated glass unit is 40 dB which translates to approximately 10,000-fold reduction of noise level. When choosing special noise dampening insulated glass units, one can achieve even up to 51 dB sound insulation.
  • Wooden window finish system from Finnish company TEKNOS offers environmentally-friendly water-based varnishes and paints. Standard offer includes 54 hues of varnishes and covering paints from RAL or NCS catalogues.

Fittings from German company ROTO allow opening the window, to tilt it or fix in micro-ventilation mode (winter ventilation).
Windows that can be opened and opened/tilted can have also oblique or arc-shaped upper part, while windows that cannot be opened have virtually no limitations. Customers can choose hidden fittings for rectangular windows.

Thermal conductivity coefficient of a window

Thermal conductivity coefficient of a window Uw represents the heat loss through a square meter of the window area when the temperature difference is 1°C. The lower the number, the more energy-efficient is the window (saving heat). According to the standard DIN EN ISO 10077-1, it is calculated and also verified for turn-only windows with dimensions 1230*1480mm. Uw is mainly determined by thermal conductivity of the insulating glass unit and wooden frame and sash, as well as by the spacers of the insulating glass unit and sash seals. By choosing an insulating glass unit with the so-called “warm” spacer, Uw of the window may be reduced by approximately 0.1 W/m2*K. Since usually the thermal conductivity of an insulating glass unit is significantly lower than that of the wooden frame and sash, then Uw will be higher for a smaller window and window with divisions. This means that heat losses through a square meter of the window will increase. For wooden windows, Uw ranges from 0.7 to 1.8 W/m2*K depending on the profile system, the type, size and configuration of the insulating glass unit.

Insulating glass unit

An insulating glass unit consists of 2 (a single-chamber unit) or 3 (a double-chamber unit) glasses and separating slats or spacers, the whole structure is glued and sealed using a butyl sealant. Spacers usually are made of aluminium or aluminium combined with plastic materials (the so-called “warm” spacers). The space between the glasses is filled with argon. Energy-efficient insulating glass units feature a special (selective) coating on the glass surface, which reflects the infrared (heat) radiation back into the room reducing heat loss. This feature of the insulating glass unit is characterized by thermal permeability coefficient Ug (W/m2*K). The smaller the coefficient, the less heat is lost through the insulating glass unit. For a single-chamber insulating glass unit (with 2 glasses) the Ug value is around 1.1 W/m2*K, for a double-chamber (with 3 glasses) it ranges from 0.8 up to 0.5 W/m2*K, depending on the glass type, the type of selective coating and thickness of the insulating glass unit. For comparison – for a 4mm single-layer glazing Ug =5.7 W/m2*K.

The sound insulation

The range of human ear sensitivity is extremely wide, therefore in acoustics the sound intensity is measured in logarithmic units – decibels (dB). The quietest sound a human ear can perceive (threshold of hearing) is assumed to be 0 dB. Different volume levels can be roughly described as follows:

20 dB- rustling leaves (100 times greater sound intensity than 0dB)

30 dB- whisper (1000 times greater sound intensity than 0dB)

40 dB- peaceful classroom (10000 times greater sound intensity than 0dB)

50 dB- a passing car (100000 times greater sound intensity than 0dB)

60 dB- human speech (1000000 times greater sound intensity than 0dB)

80 dB- heavy traffic in city

100 dB- perforator

120 dB- rock concert

140 dB- pain threshold (100000000000000 times greater sound intensity than 0dB)

180 dB- rocket launch

Therefore, if the sound insulation of a window is 30 dB, which means loss of sound intensity by 1000 times, the human voice speaking outside the window we hear as a whisper. The change in volume by 3 dB people perceive as barely noticeable.

Window fittings

Window fittings is a complex mechanism made from may components allowing to open, tilt and lock the sash of a window or balcony door in the microventilation position (“winter ventilation”). We use the system Roto NT produced by Roto which allows creating both rectangular and arched sashes, as well as sashes of other shapes.

The permissible width of a standard rectangular sash is 330÷1630mm, height 320÷2630mm, the maximum sash area 2.5m2, the maximum weight 150kg. Different non-standard solutions are available. For rectangular sashes, concealed hinges may also be selected; for heavy balcony doors (tilt&turn up to 200kg, turn-only up to 300kg) we use increased-load hinges Roto Powerhinge.

Handles and hinge cover plates

Possible tones of colours for handles and hinge cover plates:

Handle mechanism:

other types of handles

Apart from the standard handles, other types of handles are also available:

  • Handle with a button (press the button to turn the handle) – for child safety;

 

 

 

 

  • Lockable handle – also mainly for child safety;

 

 

 

 

  • Double-sided handle – commonly used in balcony doors along with a cylinder key mechanism.

 

 

 

 

 

 

    balcony door

    Structure of the simplest balcony door (e.g., in apartment houses) does not differ from the structure of a window, but there are different options. Balcony doors often feature the so-called “smoker’s handle”, which helps to close and easily lock the balcony doors from outside.

    Aluminium threshold, which is lower than a wooden frame with a drip edge (32mm aluminium instead of a 80mm wooden threshold) and also more durable, produced by Gutmann is possible.

    Double-sided handle and a key with cylinder mechanism may be installed to be able to unlock and open the door also from the outside – e.g., for an exit to the terrace. Arched balcony door may be produced. For rectangular sashes, the concealed hinges may be selected, and by using the increased-load hinges you can build a big balcony door with heavy sashes.

    Var izgatavot arkveida balkona durvis. Taisnstūra vērtnēm var izvēlēties slēptās eņģes, bet, izmantojot paaugstinātas slodzes eņģes, var veidot lielas balkona durvis ar smagām vērtnēm.

    Silicone sealant

    Silicone sealant seals the connection of the insulating glass unit around the perimeter both from the inside and from the outside. Possible colours of silicone – transparent, white, black, brown and grey in different gradations, in total – 16 different tones. We use the silicone MultiSil produced by Remmers.

     

    Aluminium drip

    Aluminium drip cap protects the lower horizontal part of the sash profile from moisture. The standard colours of the drip cap are white, anodised aluminium (EV1), light bronze and dark bronze, painting in RAL tone is possible. We use the aluminium drip cap produced by Aluron.

    Rubber seals

    Rubber seals around the sash perimeter provide sealing of the window in closed position, as well as protect the closing mechanism or fittings from the impact of external environment. Wooden windows usually have 2 or 3 sealing contours. We use the rubber seals produced by Deventer. Possible colours: