PASSIVE HOUSES:

What does it mean when a house is called passive?

It's all in the numbers: A house is deemed 'passive' when it's energy consumption is less than 15 kWh / m2 per year.



Passive VELOX

Thanks to the excellent properties of VELOX building systems it's possible to build passive houses. In preparation of the overall design of the building and the subsequent detailed solutions, one must take into account the need for consistently low energy consumption. The energy performance of the building will affect (to varying degrees depending on the nature of the particular project), the following:

  • Selection of building land.
  • Orientation of the building with regard to the impact of direct sunlight during the year.
  • Present and future anticipated shading from surrounding buildings, terrain and vegetation.
  • Prevailing wind direction.
  • The shape of the building (compactness of the overall surface) which is most easily expressed in geometric characteristics, ie the ratio between the cooled surface of the building envelope and the heated volume (lower values are usually more favourable).
  • Thermal bridges in the structure and significant thermal bonds between structures caused by any conceptual limitations of the building design.
  • Internal arrangements with regard to compliance of heating modes, thermal zones and orientation of spaces.
  • Size of heated and indirect heated floor area (volume) and appropriateness for purpose.
  • Size of external glass surfaces.
  • Expected internal heat gains by nature of intended use.
  • External connections.

Taking these points into account, it is possible to propose a building solution that effectively achieves low power consumption, with low investment costs and a low environmental burden throughout the lifecycle of the building.

To maximise low energy performance it is usually best to influence the development of the overall concept in the preparatory phase of the project, especially when coordinating the functional elements of the load-bearing design. Such an approach should be achieved in part by the balance of volume and the design of technological and structural solutions with low energy performance in mind.

Velox Passive Houses

It is possible to build passive houses thanks to the excellent properties of VELOX building systems.

The overall concept of a passive house must take into account the need for consistently low energy consumption making VELOX an ideal solution.

Business signs 
Wall Construction
The thickness of the walls without plaster
mm
Using a thickness beat.insulation (polystyrene foam) 
mm
Thermal resistance (ČSN 73 0540) R (wall without plaster) 
m 2 K / W
Heat transfer coefficient U (wall without plaster) 
W / m 2 K
Index of air flak sonority R W (wall with plaster) 
dB
 
ZL 40 
WS-35 EPS 215/150/WS
400 outer wall with 180 mm insulation 5.45 0.18 49
AL 37 plus 
WS-EPS-plus 185/150/WS 35
370 outer wall with 150 mm insulation 5.40 0.18 49
AL 37 
WS-35 EPS 185/150/WS
370 outer wall with 150 mm insulation 4.66 0.21 49
LL 22 
35 WS 35/150/WS
220 internal bearing walls, basement walls without insulation 0.66 1.51 57
L 7.5 
GG 10 
WS 75 
WS 50 50/WS
75 
100
partition 0.79 
0.90
0,952 
0,862
39 
39
Download Velox information Velox-Information.pdf
 
 
thermal
  THERMAL
stable
STABLE
easy cut
EASY CUT
adhesive
ADHESIVE
sound optimal
SOUND OPTIMAL
fire resistant
FIRE RESISTANT
easy join
EASY JOIN
hygenic
HYGENIC   
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THERMAL

Unique properties of the Velox Building System

THERMAL
THERMAL
Velox panels have optimal thermal insulation properties. This results in a living environment that is naturally warm in winter and cool in summer – even in extreme temperatures, and compared to traditional building methods requires minimal heating.
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THERMAL

Unique properties of the Velox Building System

THERMAL
STABLE
Velox boards are especially stable under load and are particularly resistant to warping and bending. A Velox build forms a rigid structure that won't crack, creak or distort.
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THERMAL

Unique properties of the Velox Building System

THERMAL
ADHESIVE
Velox boards have excellent adhesive properties. They are simple to plaster, concrete, or cement putty both on exterior and interior walls.
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THERMAL

Unique properties of the Velox Building System

THERMAL
SOUND OPTIMAL
Velox boards have optimal sound insulating properties. Interior sound is echo-free and exterior sound is extremely well insulated. Velox is often employed specifically for its sound insulation – as noise barriers near motor- ways for example.
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THERMAL

Unique properties of the Velox Building System

THERMAL
FIRE RESISTANT
Velox is naturally flame retardant and boasts excellent fire resistance. In tests according to the ÈSN 73 0862 classification of the flammable levels of building materials Velox achieved a 'B' grade - 'hardly flammable'.
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THERMAL

Unique properties of the Velox Building System

THERMAL
EASY JOIN
Velox boards are very easy to join. They can be nailed, screwed, dowelled or glued. This makes them versatile, simple and fast to manipulate into the desired arrangement.
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THERMAL

Unique properties of the Velox Building System

THERMAL
HYGENIC
Velox builds have excellent hygene and health properties, are resistant to fungi and rodents and are approved by the Czech republic’s main authorised health and hygene authority.