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LEED v4.1
Warehouses & Dist. Ctrs. - NC
Indoor Environmental Quality
Daylight

LEED CREDIT

Warehouses-NC-v4.1 EQc7: Daylight 1-3 points

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© Copyright U.S. Green Building Council, Inc. All rights reserved.

Intent

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

Requirements

Provide manual or automatic (with manual override) glare-control devices for all regularly occupied spaces. AND Select one of the following three options.

Option 1. Simulation: Spatial Daylight Autonomy and Annual Sunlight Exposure (1–3 points, 1-2 points Healthcare)
Perform annual computer simulations for spatial daylight autonomy300/50% (sDA300/50%), and annual sunlight exposure1000,250 (ASE1000,250 ) as defined in IES LM-83-12 for each regularly occupied space. Healthcare projects must use each regularly occupied space located in the perimeter area determined under EQ Credit Quality Views. Additionally, calculate the average sDA300/50% value for the total regularly occupied floor area. For any regularly occupied spaces with ASE1000,250 greater than 10%, identify how the space is designed to address glare. Points are awarded according to Table 1.
Table 1. Points for Option 1
New Construction, Core and Shell, Schools, Retail, Data Centers, Warehouses and Distribution Centers, Hospitality Healthcare
The average sDA300/50% value for the regularly occupied floor area is at least 40% 1 point 1 point
The average sDA300/50% value for the regularly occupied floor area is at least 55% 2 points 2 points
The average sDA300/50% value for the regularly occupied floor area is at least 75% 3 points Exemplary performance
Each regularly occupied space achieves sDA300/50% value of at least 55% Exemplary performance or 1 additional point if only 1 or 2 points achieved above. Exemplary performance or 1 additional point if only 1 point achieved above.
The sDA and ASE calculation grids should be no more than 2 feet (600 millimeters) square and laid out across the regularly occupied area at a work plane height of 30 inches (762 millimeters) above finished floor (unless otherwise defined). Use an hourly time-step analysis based on typical meteorological year data, or an equivalent, for the nearest available weather station. Include any permanent interior obstructions. Moveable furniture and partitions may be excluded. OR
Option 2. Simulation: Illuminance Calculations (1–3 points, 1-2 points Healthcare)
Perform computer simulations for illuminance at 9 a.m. and 3 p.m. on a clear-sky day at the equinox for each regularly occupied space. Healthcare projects should use the regularly occupied spaces located in the perimeter area determined under EQ Credit Quality Views. Demonstrate illuminance levels are between 300 lux and 3,000 lux at both 9 a.m. and 3 p.m. Spaces with view-preserving automatic (with manual override) glare-control devices may demonstrate compliance for only the minimum 300 lux illuminance level. Points are awarded according to Table 2.
Table 2. Points for Option 2
New Construction, Core and Shell, Schools, Retail, Data Centers, Warehouses and Distribution Centers, Hospitality Healthcare
Percentage of regularly occupied floor area Points Percentage of regularly occupied floor area within perimeter area Points
55% 1 55% 1
75% 2 75% 2
90% 3 90% Exemplary performance
Calculate illuminance intensity for sun (direct component) and sky (diffuse component) for clear-sky conditions as follows:
  • Use typical meteorological year data, or an equivalent, for the nearest available weather station.
  • Select one day within 15 days of September 21 and one day within 15 days of March 21 that represent the clearest sky condition.
  • Use the average of the hourly value for the two selected days.
Exclude blinds or shades from the model. Include any permanent interior obstructions. Moveable furniture and partitions may be excluded. OR
Option 3. Measurement (1-3 points, 1-2 points Healthcare)
Measure illuminance in each regularly occupied space. Healthcare projects should use the regularly occupied spaces located in the perimeter area determined under EQ Credit Quality Views. Achieve illuminance levels between 300 lux and 3,000 lux. Spaces with view-preserving automatic (with manual override) glare-control devices may demonstrate compliance for only the minimum 300 lux illuminance level. Points are awarded according to Table 3.
Table 3. Points for Option 3
New Construction, Core and Schools, Schools, Retail, Data Centers, Warehouses and Distribution Centers, Hospitality Healthcare
Percentage of regularly occupied floor area Points Percentage of regularly occupied floor area within perimeter area
55% at one time in the year 1 55% at one time in the year 1
75% at two times in the year 2 75% at two times in the year 2
90% at two times in the year 3 90% at two times in the year exemplary performance
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.
  • If pursuing one point, take one measurement in any regularly occupied month. If pursuing two points, take two measurements: one measurement in any regularly occupied month, and take a second as indicated in Table 4.
  • 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 millimeters) square grid.
Table 4. 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
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Addenda

11/9/2020Updated: 2/3/2021
Form Update
Description of change:
Updated to align with v4.1 November 2020 Addenda
Campus Applicable
No
Internationally Applicable:
No
7/29/2022
LEED Interpretation
Inquiry:

We are requesting that the requirement for glare control on warehouse clerestory windows be removed for warehouse projects. The requirement to install glare control devices or diffuse/translucent glazing for warehouse clerestory windows is problematic for several reasons:
1. It is not practical to install manual or automatic glare control devices in these clerestory windows given that they are typically 30' above the floor and are spaced out along the length of the warehouse (commonly more than 1,000').
2. The amount of glare that can be introduced by these windows is relatively small.
a. The window-to-wall ratio for warehouse clerestory windows is typically less than 5% and they are located high above the work area.
b. The bays deeper into the interior of the warehouse space is where potential glare from clerestory windows would more likely be a problem (based on sun angles), yet racking and product is generally located in this area that would tend to block any direct line of sight to such glare for those occupants that occasion the far interior of the warehouse space.
c. The bays along the perimeter of the warehouse space is where most of the occupants work (the "speed bay" area just inside the loading docks). The high sun angles required to generate direct line of sight to the sun in these areas is less troublesome than low sun angles (much as noon sun is less problematic than sunrise/sunset glare when driving). These high angles also result in the effective opening of the clerestory window being reduced, further reducing the likelihood of glare.
3. Warehouse workers have the ability to mitigate the effect of minor glare within their environment as they tend to have more mobility in their work than their seated office counterparts.
4. Requiring clerestory windows to be diffuse/translucent (the only feasible means of satisfying the credit requirement for warehouses) removes the warehouse occupants' only connection to the outdoors. This is perhaps the most troublesome of the outcomes, as equity within the space is a major consideration such that warehouse operators are careful to provide the best work environment possible for the warehouse workers. The clerestory windows are often these workers' only means of experiencing the sky, weather conditions, and the natural changes of daylight throughout their workday.

Ruling:

Yes, glare control devices may be excluded for warehouse clerestory windows when the following criteria apply: (1) Warehouse clerestory windows have a sill height of at least 3/5 the wall height, and (2) Warehouse clerestory windows have a window to wall ratio of no more than 5%.

Campus Applicable
No
Internationally Applicable:
No
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© Copyright U.S. Green Building Council, Inc. All rights reserved.

Intent

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

Requirements

Provide manual or automatic (with manual override) glare-control devices for all regularly occupied spaces. AND Select one of the following three options.

Option 1. Simulation: Spatial Daylight Autonomy and Annual Sunlight Exposure (1–3 points, 1-2 points Healthcare)
Perform annual computer simulations for spatial daylight autonomy300/50% (sDA300/50%), and annual sunlight exposure1000,250 (ASE1000,250 ) as defined in IES LM-83-12 for each regularly occupied space. Healthcare projects must use each regularly occupied space located in the perimeter area determined under EQ Credit Quality Views. Additionally, calculate the average sDA300/50% value for the total regularly occupied floor area. For any regularly occupied spaces with ASE1000,250 greater than 10%, identify how the space is designed to address glare. Points are awarded according to Table 1.
Table 1. Points for Option 1
New Construction, Core and Shell, Schools, Retail, Data Centers, Warehouses and Distribution Centers, Hospitality Healthcare
The average sDA300/50% value for the regularly occupied floor area is at least 40% 1 point 1 point
The average sDA300/50% value for the regularly occupied floor area is at least 55% 2 points 2 points
The average sDA300/50% value for the regularly occupied floor area is at least 75% 3 points Exemplary performance
Each regularly occupied space achieves sDA300/50% value of at least 55% Exemplary performance or 1 additional point if only 1 or 2 points achieved above. Exemplary performance or 1 additional point if only 1 point achieved above.
The sDA and ASE calculation grids should be no more than 2 feet (600 millimeters) square and laid out across the regularly occupied area at a work plane height of 30 inches (762 millimeters) above finished floor (unless otherwise defined). Use an hourly time-step analysis based on typical meteorological year data, or an equivalent, for the nearest available weather station. Include any permanent interior obstructions. Moveable furniture and partitions may be excluded. OR
Option 2. Simulation: Illuminance Calculations (1–3 points, 1-2 points Healthcare)
Perform computer simulations for illuminance at 9 a.m. and 3 p.m. on a clear-sky day at the equinox for each regularly occupied space. Healthcare projects should use the regularly occupied spaces located in the perimeter area determined under EQ Credit Quality Views. Demonstrate illuminance levels are between 300 lux and 3,000 lux at both 9 a.m. and 3 p.m. Spaces with view-preserving automatic (with manual override) glare-control devices may demonstrate compliance for only the minimum 300 lux illuminance level. Points are awarded according to Table 2.
Table 2. Points for Option 2
New Construction, Core and Shell, Schools, Retail, Data Centers, Warehouses and Distribution Centers, Hospitality Healthcare
Percentage of regularly occupied floor area Points Percentage of regularly occupied floor area within perimeter area Points
55% 1 55% 1
75% 2 75% 2
90% 3 90% Exemplary performance
Calculate illuminance intensity for sun (direct component) and sky (diffuse component) for clear-sky conditions as follows:
  • Use typical meteorological year data, or an equivalent, for the nearest available weather station.
  • Select one day within 15 days of September 21 and one day within 15 days of March 21 that represent the clearest sky condition.
  • Use the average of the hourly value for the two selected days.
Exclude blinds or shades from the model. Include any permanent interior obstructions. Moveable furniture and partitions may be excluded. OR
Option 3. Measurement (1-3 points, 1-2 points Healthcare)
Measure illuminance in each regularly occupied space. Healthcare projects should use the regularly occupied spaces located in the perimeter area determined under EQ Credit Quality Views. Achieve illuminance levels between 300 lux and 3,000 lux. Spaces with view-preserving automatic (with manual override) glare-control devices may demonstrate compliance for only the minimum 300 lux illuminance level. Points are awarded according to Table 3.
Table 3. Points for Option 3
New Construction, Core and Schools, Schools, Retail, Data Centers, Warehouses and Distribution Centers, Hospitality Healthcare
Percentage of regularly occupied floor area Points Percentage of regularly occupied floor area within perimeter area
55% at one time in the year 1 55% at one time in the year 1
75% at two times in the year 2 75% at two times in the year 2
90% at two times in the year 3 90% at two times in the year exemplary performance
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.
  • If pursuing one point, take one measurement in any regularly occupied month. If pursuing two points, take two measurements: one measurement in any regularly occupied month, and take a second as indicated in Table 4.
  • 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 millimeters) square grid.
Table 4. 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

LEEDuser expert

Daniel Glaser

LightStanza
Principal

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