Compose or design a wall or building point element

The description window of a building element in COCON-BIM is used to compose a wall or building element from materials (watch video).

The functional unit (FU) of a building element is systematically reduced as appropriate to:

    • a surface area of 1 m² (wall, partition, roof, etc.)
    • a length of 1 linear metre (lm) (beam, post, tube, etc.)
    • a volume of 1 m3 (concrete block, etc.). 

Description et composition d'une paroi

 The description window of a building element consists (from top to bottom) of:

  • the input/edit area for its name.
  • the type of building element via:
    • the "Wall" button (walls, partitions, slabs, floors, roofs, reveals, etc.)
    • the "Point element" button (columns, beams, etc.) which is used to specify the shape (round, oval, square, rectangular, complex) and dimensions.
    • the "Volume" button
  • its main dynamic thermal characteristics calculated in accordance with standard EN 13786:
    • RSI (Internal surface thermal resistance).
    • RSE (External surface thermal resistance).
    • Dynamic thermal calculation period to be applied (1 day, 10 days, 30 days, one year).
    • Interior thermal inertia
    • Thermal phase displacement (in hours)
    • Thermal damping (as %)
  • a summary of the environmental parameters:
    • Prescribed lifetime - expressed in number of years.
    • Carbon tax (in €/m² or €/ml) applicable on the basis of the life cycle of the materials used.
  • the "Composition" tab
  • the "LCA" tab.
  • the "Materials..." button which opens the "Materials library" window and allows materials to be dragged and dropped from it to compose the building element.
  • the "Undo"/"Redo" buttons for the latest actions.
  • the "Save" button which saves the building element in the library.
  • the "Cancel" button which closes the window without saving any changes made.

 The "Composition" tab contains the list (ordered by default from the outside to the inside) of the components (materials) making up a building element, each of which has:

  • a "layer" or "point element" or "integrated point element" symbol editable by right clicking, which controls:
    • thermal calculations. Thermal performance is determined by adding the thermal resistances of the layers.
    • volume calculations. The real volumes are determined by adding those of the layers and point elements and by subtracting the volume from integrated ones.
    • mass calculations. The weight of the materials takes account of their real volume and density.
    • environmental calculations. The volumes and actual weight of the components are used to determine their impacts.
  • the name of the material
  • the unit in which the required quantity of the material is expressed using the following coding:






100 mm of insulation per m² of wall

Quantity per m²

1 m² of vapour barrier per m² of lining



3 ml of metal framing per m² of lining



0.025 m3 of wood per m² of roofing


Number of units

1 rain screen per m² of wall


Flow in mm

3000x145x45 or 3,000 mm of frame uprights measuring 145 x 45 mm.
    • the year the material is used. This optional value is provided only in the case of a refurbishment and reduces the environmental impacts of the material concerned.
    • the DVC - Corrected lifetime of the material. This optional value is filled in only where the default life of a material is not to be applied.
    • (optional) rules for weighting impacts by life-cycle phaseThese can be used to model the reuse of materials, particular transport distances, etc.
    • a comment with free-text content. This optional value is entered:
      • either semi-automatically when a wall is created, from the description of the building element already present in the digital model,
      • or manually.
    • thermal data:
      • Thermal conductivity
      • Thermal losses,
      • Thermal resistance
    • quantitative information:
      • Volume (m3)
      • Weight (kg)

The LCA (Life Cycle Analysis) tab is made up of several areas:

  • on the left is the data viewing area with vertical mini tabs
    • Histogram: displays a horizontal bar histogram by impact indicator relating to the life-cycle analysis of each component of the building element. Right-click to export the selected graph to the clipboard or to an image file.
    • Table: displays numerical values by impact indicator relating to the life-cycle analysis of each component of the building element. Right-click to export the data to the clipboard or to a csv file (compatible with Excel, Open Office, etc.).
    • Radar: displays a radar diagram, each branch of which corresponds to an impact indicator. Right-click to export the selected graph to the clipboard or to an image file.
  • on the right is displayed data selection area which controls:
    • the lifetime (in years) for which the LCA is being carried out
    • the list of impact indicators to be displayed (checkboxes):
      • Greenhouse gases (GHG)
      • Destruction of the stratospheric ozone layer
      • Photochemical ozone formation
      • Total primary energy
      • Renewable primary energy
      • Non-renewable primary energy
      • Primary process energy
      • Primary energy material
      • Water consumption
      • Hazardous waste disposed of
      • Non-hazardous waste disposed of
      • Radioactive waste disposed of
    • the life-cycle phases for which the impacts are shown (checkboxes):
      • Overall (see figure)
        • Entire life cycle (standard NF P 01-010 and, where appropriate, standard EN 15804)
        • Total available (simple sum of the phases checked and available).
      • In semi-detail as per standard EN 15804 (see figure)
        • A1-A3: Production stage
        • A4-A5: Construction stage
        • B1-B7: Use stage
        • C1-C4: End-of-life stage
        • D: Benefits beyond system boundaries
      • In fine detail (standard EN 15804)
        • A1: Raw material supply
        • A2: Transport
        • A3: Manufacture
      • A4: Transport
      • A5: Use
      • B1: Use
      • B2: maintenance
      • B3: Repair
      • B4: Replacement
      • B5: Refurbishment
      • B6: Energy consumption while the building is in use
      • B7: Water consumption while the building is in use
      • C1: Demolition / dismantling
      • C2: Transport
      • C3: Waste transport
      • C4: Disposal
      • D: Benefits beyond system boundaries

 Visualisation graphique de l'analyse en cycle de vie d'un élements constructif



Etapes du cycle de vie selon norme EN 15804