Schools-EBOM-v4 EQc5: Daylight and quality views

  • Possible to achieve, but time-consuming

    Most buildings aren’t able to change the daylight or views available in occupied spaces–you’ve either got it or you don’t. Because there’s little opportunity for teams to impact the credit outcome, most projects tend to pursue this credit late in the performance period and only if additional LEED points are needed.

    The good news is that it should be relatively easy to get a good sense of whether your project complies or not with either the daylight or views option. Although time consuming, assessing daylight via measurements should be fairly straightforward if you have access to all of the regularly occupied spacesRegularly occupied spaces are areas where one or more individuals normally spend time (more than one hour per person per day on average) seated or standing as they work, study, or perform other focused activities inside a building.. The views option is a bit more complicated given that the views need to meet at least two of the four available criteria for quality views.

    What’s New in LEED v4

    • The simulation and prescriptive options for daylighting compliance have been eliminated.
    • To satisfy Option 1, you must take daylight measurements at two times of the year.
    • USGBC now requires glazing to provide a clear view of the outdoors to count toward views requirements, and view quality is also a component. The glazing does not have to be located between 30 and 90 inches (750 and 2300 mm) above the finished floor.
    • Atriums now qualify for up to 30% of the total area.

    FAQs

    What is the “view factor” and how do I calculate it?

    The view factor is an approximation of the quality of the view that an individual has at their workstation. So, if you’ve got a larger building with many workstations, this is probably not a great method to show quality views. The LEED Reference Guide includes further explanation for how to calculate the view factor for an individual workstation.

  • EQ Credit 5: Daylight and quality views

    Intent

    To connect building occupants with the outdoors, reinforce circadian rhythms, and reduce the use of electrical lighting by introducing daylight and views into the space.

    Requirements

    Establishment

    Option 1. Daylight Measurement (2 points)

    Achieve illuminance levels between 300 luxMeasurement of lumens per square meter. and 3,000 lux for at least 50% of the regularly occupied floor area.

    With furniture, fixtures, and equipment in place, measure illuminance levels as follows:

    • Measure at appropriate work plane height during any hour between 9 a.m. and 3 p.m.
    • Take one measurement in any regularly occupied month, and take a second as indicated in Table 1.
    • For spaces larger than 150 square feet (14 square meters), take measurements on a maximum 10-foot (3-meter) square grid.
    • For spaces 150 square feet (14 square meters) or smaller, take measurements on a maximum 3-foot (900-millimeter) square grid.
    • Table 1. Timing of measurements for illuminance

      If first measurement is taken in … take second measurement in …
      January May-September
      February June-October
      March June-July, November-December
      April August-December
      May September-January
      June October-February
      July November-March
      August December-April
      September December-January, May-June
      October February-June
      November March-July
      December April-August



      AND/OR

      Option 2. Quality Views (2 points)

      Achieve a direct line of sight to the outdoors via vision glazing for 50% of all regularly occupied floor area. View glazing in the contributing area must provide a clear image of the exterior, not obstructed by frits, fibers, patterned glazing, or added tints that distort color balance.

      Additionally, 50% of all regularly occupied floor area must have at least two of the following four kinds of views:

      • multiple lines of sight to vision glazing in different directions at least 90 degrees apart;
      • views that include at least two of the following: (1) flora, fauna, or sky; (2) movement; and (3) objects at least 25 feet (7.5 meters) from the exterior of the glazing;
      • unobstructed views located within the distance of three times the head height of the vision glazing; and
      • views with a view factor of 3 or greater, as defined in “Windows and Offices; A Study of Office Worker Performance and the Indoor Environment.”
      • Include in the calculations any permanent interior obstructions. Movable furniture and partitions may be excluded.

        Views into interior atria may be used to meet up to 30% of the required area.

        Performance

        None.

0 Comments

Start a new LEED comment thread

Feb 21 2017
Type the characters you see in this picture. (verify using audio)
Type the characters you see in the picture above; if you can't read them, submit the form and a new image will be generated. Not case sensitive.

Copyright 2017 – BuildingGreen, Inc.