The Norwegian Byggteknisk forskrift § 13-7. Lys states:

  • a.The average daylight factor in the room must be at least 2.0%.
    Compliance is documented with calculations of most critical rooms in relation to daylight conditions. Calculations are performed with simulation tool validated by CIE 171: 2006 and assumptions given in NS-EN 12464-1: 2011 chapter 4.4.

  • b.For rooms in a dwelling unit, the day-time requirement may alternatively be documented using the following method:
    A;g × LT ≥ 0.07 × A;BRA 

  • c.For holiday homes, the daily requirement can be documented as follows:
    A;g ≥ 0.1 × A;BRA


Whereas:

  • A;g = the glass area to the outside which is located at least 0.8 m above the floor of the room and as not in the dug
  • A;BRA = space usage area, including area underneath the balcony or other similarly protruded building parts in the room width outside the window facade.
  • LT = the light transmission of the glass The method assumes that there is nothing that screens the horizon at an angle more than 45 degrees measured from the horizontal plane.


Link to Daylight Application

Point a. can be calculated with the Naviate Daylight Factor feature enabled.

Point b. and c. can be checked with the daylight application. See below steps.



Application settings

  1. Under Settings, set the calculation standard to "Norwegian building regulations..."
  2. Add the missing glazing material names for the project.
  3. Add the room names of the balconies in your Revit model.
    Please make sure in the model all balconies have a room and a balcony room name
    As a result of this setting, some rooms will have a bigger floor area, because of the floor area of the balcony above, so there is more glazing area needed to meet the minimum of 7% (or 10%) daylight ratio.
  4. Set the transparency factorto "family type; visual light transmittance" or "material, shading, transparency" for which value you would like to use for "LT".   

    The LT transparency value can be read from the Revit glazing material, or the Revit window properties.

    The transparency do not need to be set for point c. (holiday homes) so you can then disable the checkbox "include transparency factor".
  5. Click "Ok". The daylight areas will now be calculated.
  6. Select which rooms are required to have daylight by changing the checkbox "requires daylight" for each room.
    • You can also quickly change multiple daylight requirements per room at once, by using the "auto-fill required values". Type in the (part of the) room names and the required percentage; for point b. is this 0% for corridors (no daylight required) and 7% for living rooms and other occupiable rooms. For point c. is this 0% respectively 10%.
    • Another option is to change the room parameter in Revit by selecting one or multiple rooms in Revit, and change the "value
  7. You're now set for Norwegian Daylight calculation for your project!

Calculation

  • The minimum height for the daylight area is 800 mm, so all glazing area below 800 mm above floor will not be counted. For more info see calculation method, minimum height above floor.
  • The balcony area above a window will be added to the adjacent room. See below image from the TEK17 documentation. For more info see calculation method, adding balcony area.
  • The transparency factor property of the glazing will be included.
  • A comment will be added to the room, if the room does not meet the criteria for the simplified calculation, point B. and C. If...
    • The width, height or perimeter of at least one window in the room is too small.
    • There is too much shading obstructions in front of the window, so that the maximum shading angle of 45° to the horizon is not met.


§ 13-7 Figur 1 Areal på utkragede bygningsdeler på planet over legges til bruksarealet til underliggende rom i rommets bredde. § 13-7 Figur 2 Avskjerming av dagslys på grunn av terreng, andre bygninger og lignende.



Reporting

Now make sure all rooms are green, by adding more windows, or changing window dimensions in Revit. When all rooms are green, daylight requirements are met, and results can be reported.

  • You can report results by clicking the "Report" button. The application will now generate a Word document with all daylight results per room and per window.
  • You can also generate a 3D visualisation by clicking the "Visualization" button, and you can generate a coloured "Revit floor plan" by clicking the Revit floor Plan.
  • After clicking "save & close" all Daylight results will be saved as shared parameters in your project. You can make custom room and window schedules to report these calculated daylight values throughout Revit.