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Prefab techniques

Le principe constructif par éléments préfabriqués se décline en béton armé ou en bois.

The constructive principle by prefabricated elements is declined in reinforced concrete or in wood.

PATENTED  Number 80 A B 7002

By :  WIPO  


Absolut prefab   Dweling configuration

House layout

Architectural and structural concept

System based on a precast concrete panel (150mm) and a prefabricated roof (steel structure) and prefabricated windows (double glazing).


Excavation foundations reinforced concrete including water tank (Option 1)    9 days

Excavation foundations precast concrete including (Option 2)                            4 days

Erection of the pre-fab concrete panels (including the first level)                        5 days

Roof steel structure                                                                                                   3 days

Roofing steel or tiles etc Including roof plumbing                                                 4 days

Windows (double glazing) garage doors                                                                4 days

Plaster board + thermal and acoustic included ceiling                                         5 days

Plumbing and electricity                                                                                           5 days


Internal works :                                                                                                         15 days

- Plumbing and electricity

- water proofing and tiling

- Hardware supplies

- joinery and kitchen

- painting

- floor covering

- Appliances

- Sanitary wared


Not included landscaping and fences

 TOTAL:                                                                                                                     54 days



Sample based on  type :          2A (252 m²)

                                                   2B (264 m²)

                                                   6C (288 m²)

  1. Preliminaries                                                                                                          4%

  2. Excavation                                                                                                              3%

  3. Form work (footing)                                                                                               2%

  4. Renforcement                                                                                                        1%

  5. Concrete                                                                                                                 4%

  6. Pre cast concrete                                                                                                  28%

   7. Carpentry fixout                                                                                                      6%

   9.  First floor structure                                                                                                 2%

 10. Trusses roofing                                                                                                        5%

11. Roof/plumbing                                                                                                          5%

12. Plumbing + water tank                                                                                            3.5%

13. Ceiling (plasterboard)                                                                                              2%

14. Materials walls (plasterboard)                                                                                 3%

15. Windows-double glazing-shutters-garage doors                                                 6%

16. Hardware supply                                                                                                      1%

17. Joinery :wardrobe                                                                                                     3%

18. Joinery :kitchen                                                                                                         3%

19. Joinery :doors                                                                                                           1%

20. Floor covering                                                                                                          5%

21. Waterproofing tiling                                                                                              0.5%

22. Sanitary ware                                                                                                             3%

23. Painting                                                                                                                      3%

24. Services -electricity - solar panel                                                                              4%

25. Air-conditioning heating system                                                                              2%

26. External works:                                                                                                            _

27. Landscaping and fences                                                                                             _

28. Services -water                                                                                                            _

29. Services -electrical​                                                                                                      _


Average by m²: 

$ 1 500.00/m² 



The ability of the residential development to optimize thermal performance, thermal comfort and daylighting will contribute to the energy efficiency of buildings,  provide increased amenity to occupants and reduce greenhouse emissions and, with them, the cost of supplying energy.


  • To reduce the necessity for mechanical heating and cooling

  • To reduce reliance on fossil fuels

  • To minimize greenhouse gas emissions

  • To support and promote renewable energy initiatives


Better design practice

  • Incorporate passive solar design techniques to optimize heat storage in winter and heat transfer in summer by:

  • maximizing thermal mass in floor and walls in northern rooms of dwelling

  • polishing concrete floors and/or using tiles or timber: floor rather than carpets

  • insulating roof/ceiling to R : 2.0; external walls and the floor to R :1.0


  • improve the control of mechanical space heating and cooling by:

  • designing heating/cooling systems to target only those spaces which require heating

  • allowing for. adjustable awnings and blinds to be attached to the outside of windows to keep the heat out in summer

  • providing gas bayonets living areas where gas is available

  • providing reversible ceiling fans for improving heated air in winter


  • Provide installation of photovoltaic panels by:

  • Designing the roof so that photovoltaic panels can be mounted parallel to the roof plane

  • locating trees where they will not shade existing or planned photovoltaic installations


  • Improve the efficiency of hot water systems by:

  • Insulating a hot water system or systems with a Greenhouse Score of 3.5 or greater and which suits the needs of the development and/or individual dwellings

  • installing water-saving devices, such as flow regulators AAA rated shower heads, dual flush toilets and taps aerators.


  •   Reduce reliance on artificial lighting by:

  • providing a mix of lighting fixtures including dimmable lighting, to provide for a range of activities in different rooms

  • designing to allow for different possibilities for lighting the rooms. for example, low background lighting supplemented by task or effect lighting for use as required

  • using separate switches for special purpose lighting

  • using high efficiency lighting, such 'as compact fluorescent

  • using motion detectors for common areas, lighting and car parks


  •   Maximize the efficiency of household appliance by:

  • selecting an energy source with minimum greenhouse emissions

  • installing high efficiency refrigerators/freezers, clothes washers and dishwashers

  • providing areas for clothes to be dried through natural ventilation.


  • See daylight access and natural ventilation for additional energy efficiency information.





  • To entire a high level of amenity by protecting the privacy of residents

  • Utilize the site and house layout to maximize the potential for acoustic privacy

  • Design the internal layout to separate noises spaces from quieter spaces

  • Resolve conflicts between noise, outlook and views by using design measure including:

  • Double glazing (windows)

  • Plasterboard and thermal or alumic insulation on the fab panel

  • Operable screened



  • To ensure that houses are designed to provide all habitable rooms with direct access to fresh air and to access the promoting thermal comfort for occupants

  • To reduce energy consummation by minimizing the use of mechanical ventilation, particularly air conditioning

  • Facilizing cross ventilation

  • Facilizing convertive currents

  • Grumping rooms, with similar usage together, keeping living spaces together and sleeping spaces together, to be compact mentalized for efficient summer cooling or winter heating (see energy efficiency)

  • Select doors and operable windows to maximize natural ventilation opportunities

  • Design solutions may include:

- Locating  small windows on the windward side and larger windows on the leeward side

- Coordinate design for natural ventilation with passive solar design technique




  • To ensure that daylight access is provided to all habitable rooms

  • To provide adequate ambient lighting and minimize the need for artificial lighting during daylight hours

  • Design for shading and glaze control, particularly in summer

  • Using shaving devices, such as caves, awnings, colonnades, pergolas, external louries and planting

  • Providing external horizontal shading to north facing windows

  • Providing vertical shading to east and west windows

  • Using high-performance double-glazing window




Water is our most precious resource. Residential flat design can contribute for environmental sustainability  by integrating measures for improved water efficiency. Water can be conserved in two ways:

1/ reducing water demands from the mains

2/ by-re-using water wich would otherwise be lost as run off or waste water


  • To reduce main consumption of potable water

  • To reduce the quantity of urban stormwater run off

Better Design Practice:

  • Collect, store and use rainwater on site. This may be used for car washing, watering the garden, toilet flushing, laundry and clothes washing. Once treated, rainwater can also be used for potable supply.

  • Incorporate local indigenous native vegetation in landscape design

  • Consider grey water recycling

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