Section 12-K-A08. A108 - INDOOR ENVIRONMENTAL QUALITY AND COMFORT

APPENDIX APROJECT ELECTIVES

 

Appendix A to the International Green Construction Code is adopted and incorporated into the Green Construction Code as Appendix A with the following modifications.

 

A108INDOOR ENVIRONMENTAL QUALITY AND COMFORT

 

Strike Table A108 in Appendix A of the International Green Construction Code in its entirety and insert new Table A108 in Appendix A of the Green Construction Code in its place to read as follows:

 

TABLE A108

INDOOR ENVIRONMENTAL QUALITY AND COMFORT

PROJECT ELECTIVES

SECTION	DESCRIPTION	MINIMUM NUMBER OF ELECTIVES REQUIRED AND ELECTIVES SELECTED
A108.2	VOC emissions – flooring	Yes	No
A108.3	VOC emissions – ceiling systems	Yes	No
A108.4	VOC emissions – wall systems	Yes	No
A108.5	Total VOC limit	Yes	No
A108.6	Views to building exterior – 50percent	Yes	No
A108.6	Views to building exterior – 75percent	Yes	No
A108.7	Daylighting – 25percent	Yes	No
A108.7	Daylighting – 50percent	Yes	No
A108.7	Daylighting – 75percent	Yes	No
A108.8	Post-construction, pre-occupancy baseline IAQ testing	Yes	No
A108.9	Post-construction, pre-occupancy flush out	Yes	No

 

Strike Section A108.6 in Appendix A of the International Green Construction Code in its entirety and insert new Section A108.6 in Appendix A of the Green Construction Code in its place to read as follows:

 

A108.6 Views to building exterior project elective.  Where projects are intended to qualify for a “views to building exterior” project elective in accordance with Section A108.6, not less than 50 percent of the net floor area shall have a direct line of sight to the exterior through clear vision glazing.  A total of not less than 45 square feet (4.18 m2) of clear vision glazing in the exterior wall or roof shall be visible.  The direct line of sight shall originate at a height of 42 inches (1067 mm) above the finished floor of the space, shall terminate at the clear vision glazing in the exterior wall or roof, and shall be less than 40 feet (12 192 mm) in length.  Projects that have a direct line of sight to the exterior for 75 percent of the net floor area shall qualify for an additional project elective.

 

Exception:  Where the direct line of sight is less than 25 feet (7620 mm) in length, a total of not less than 18 square feet (1.67 m2) of clear vision glazing in the exterior wall or roof shall be visible.

 

Insert new Sections A108.7, A108.8 and A108.9 in Appendix A of the Green Construction Code to read as follows:

 

A108.7 Daylighting project elective.  Where projects intend to qualify for a daylighting project elective, 25 percent of the net floor area shall be located within a daylit area.  Projects can receive one additional project elective with 50 percent and another additional project elective for 75 percent daylighting.  All projects shall comply with either Section A108.7.1 or Section A108.7.2.

 

A108.7.1 Daylight prescriptive requirements.  Daylit areas shall comply with Sections A108.7.1.1 or A108.7.1.2.  For determining the total daylit area, any overlapping daylit areas shall be counted only once.  Drawings clearly showing the daylit areas of the plan shall be provided as part of the permit application.

 

The total daylit area shall be the sum of the area of all sidelighting daylit areas and the area of all toplighting daylit areas, except that sidelighting daylit areas shall not be included in the calculation of the area of toplighting daylit areas.

 

A108.7.1.1 Sidelighting.  The daylit area shall be illuminated by fenestration that complies with Table A108.7.1 and Figure A108.7.1 (4).  Where fenestration is located in a wall, the daylit area shall extend laterally to the nearest 56 inch (1.4 m) high partition, or up to 2.0 times the height from the floor to the top of fenestration.  Where fenestration is located in a rooftop monitor, the daylit area shall extend laterally to the nearest 56 inch (1.4 m) high partition, or up to 1.0 times the height from the floor to the bottom of the fenestration, whichever is less, and longitudinally from the edge of the fenestration to the nearest 56 inch (1.4 m) high partition, or up to 0.25 times the height from the floor to the bottom of the fenestration, whichever is less, as indicated in Figures A108.7.1(2) and A108.7.1(3).

 

A108.7.1.2 Toplighting.  The daylit area shall be illuminated by a roof fenestration assembly such as a skylight, sloped glazing or tubular daylighting device that complies with Table A108.7.1 and Figure A108.7.2.  The daylit area extends laterally and longitudinally beyond the glazed opening of the roof fenestration assembly to the nearest 56 inch (1.4 m) high partition, or up to 0.7 times the height from the floor to the bottom of the rough opening of the daylighting well, whichever is less, as indicated in Figure A108.7.2.

 

A108.7.2 Daylight performance requirements.  Each daylit area shall comply with the requirements of either Sections A108.7.2.1 or A108.7.2.2.  Daylight analysis shall be conducted in accordance with Section A108.7.2.3.  Drawings or documents demonstrating compliance with A108.7.2 shall be provided as part of the permit application. 

 

A108.7.2.1 Morning illumination.  Not less than 28 foot-candles (300 lux) and not more than 418 foot-candles (4500 lux) of natural light shall be available at a height of 30 inches (750 mm) above the floor 3 hours before the peak solar angle on the spring equinox.

 

A108.7.2.2 Afternoon illumination.  Not less than 28 foot-candles (300 lux) and not more than 418 foot-candles (4500 lux) of natural light shall be available at a height of 30 inches (750 mm) above the floor 3 hours after the peak solar angle on the spring equinox.

 

A108.7.2.3 Daylight analysis.  A daylight analysis shall:

 

1. Assume sky conditions to be clear.

 

2. Address the effects of exterior shading devices, buildings, structures, and geological formations on the fenestration of the proposed building and on the ground and other light reflecting surfaces.  Include the effects of movable exterior fenestration shading devices.  The configuration of fenestration with automatically controlled variable transmittance shall be adjusted to accurately represent the control system operation.

 

3. Exclude the effects of interior furniture systems, shelving, and stacks.

 

4. Use the actual reflectance characteristics of all materials.

 

5. Assume that blinds, shades and other movable interior fenestration shading devices are completely diffusing, with a visible transmittance of 5 percent for fabric shades, and 20 percent for horizontal or vertical blinds.

 

6. Use calculation spaced not more than 39.4 inches (1 m) by 39.4 inches (1 m). The calculation grid shall start within 20 inches (508 mm) of each wall or partition.

 

7. Reduce the visible transmittance of all fenestration by 20 percent where details about the window framing, mullions, wall thickness and well depth cannot be included in the model.

 

A108.7.3 Sky types.  Registered design professionals shall use sky type B in determining the applicable effective aperture in Table A108.7.1.

 

A108.8 Post-construction, pre-occupancy baseline IAQ testing.  Where projects are intended to qualify for this project elective, after all interior finishes are installed, the building shall be tested for indoor air quality and the testing results shall indicate that the levels of VOCs meet the levels detailed in Table A108.8 using testing protocols in accordance with ASTM D 6196, ASTM D 5466, ASTM D 5197, ASTM D 6345, and ISO 7708.  Test samples shall be taken in not less than one location in each 25,000 square feet (1860 m2) of floor area or in each contiguous floor area.

 

A108.9 Post-construction, pre-occupancy flush out.  After construction ends, prior to occupancy and with all interior finishes installed, install new filtration media and perform a building flush-out by supplying a total air volume of 14,000 cubic feet of outdoor air per square foot (4,500 cubic meters of outdoor air per square meter) of floor area while maintaining an internal temperature of at least 60 °F (15 °C) and relative humidity no higher than 60 percent.

Insert new Table A108.7.1 in Appendix A of the Green Construction Code to read as follows:

 

TABLE A108.7.1

MINIMUM EFFECTIVE APERTURE

SKY TYPE	MINIMUM EFFECTIVE APERTURE (percentage)
	Sidelighting from fenestration in a wall [see Figure A108.7.1(1)]	Sidelighting from rooftop monitor [see Figures A108.7..1(2) and A108.7.1(3)]	Toplighting (see Figure A108.7.2)
Aa	10.0	5.0	1.0
Bb	12.0	6.0	1.2
Cc	16.0	8.0	2.2
a. Sky Type A – more than 75 percent mean sunshine, in accordance with the NOAA Annual Mean Sunshine Percentage Table.
b. Sky Type B – 45 percent to 75 percent mean sunshine, in accordance with the NOAA Annual Mean Sunshine Percentage Table.
c. Sky Type C – less than 45 percent mean sunshine, in accordance with the NOAA Annual Mean Sunshine Percentage Table.

 

Insert new Figure A108.7.1(1) in Appendix A of the Green Construction Code to read as follows (See Figure 808.3.1.1(1) of the International Green Construction Code):

FIGURE A108.7.1 (1)

DAYLIT AREA ADJACENT TO FENESTRATION IN A WALL

 

 

 

 

For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 degree = 0.017 rad.

 

Insert new Figure A108.7.1(2) in Appendix A of the Green Construction Code to read as follows (See Figure 808.3.1.1(2) of the International Green Construction Code):

FIGURE A108.7.1 (2)

DAYLIT AREA ADJACENT UNDER A ROOFTOP MONITOR

 

 

 

For SI: 1 inch = 25.4 mm.

 

Insert new Figure A108.7.1(3) in Appendix A of the Green Construction Code to read as follows (See Figure 808.3.1.1(3) of the International Green Construction Code):

 

FIGURE A108.7.1 (3)

DAYLIT AREA ADJACENT UNDER A ROOFTOP MONITOR

 

 

 

For SI: 1 inch = 25.4 mm.

 

Insert new Figure A108.7.1(4) in Appendix A of the Green Construction Code to read as follows (See Figure 808.3.1.1(4) of the International Green Construction Code):

 

FIGURE A108.7.1 (4)

SKY TYPES

Insert new Figure A108.7.2 in Appendix A of the Green Construction Code to read as follows (See Figure 808.3.1.2 of the International Green Construction Code):

 

FIGURE A108.7.2

DAYLIT AREA UNDER A SKYLIGHT

 

 

 

For SI: 1 inch = 25.4 mm.

 

Insert new Table A108.8 in Appendix A of the Green Construction Code to read as follows (See Table 804.2 of the International Green Construction Code):

 

TABLE A108.8

MAXIMUM CONCENTRATION OF AIR POLLUTANTS a 

 

MAXIMUM CONCENTRATION OF AIR POLLUTANTS RELEVANT TO IAQ	MAXIMUM CONCENTRATION ug/m3 (unless otherwise noted)
1–Methyl-2-pyrrolidinonea	160
1,1,1-Trichloroethane	1000
1,3-Butadiene	20
1,4-Dichlorobenzene	800
1,4-Dioxane	3000
2-Ethylhexanoic acida	25
2-Propanol	7000
4-Phenylcyclohexene (4-PCH)a	2.5
Acetaldehyde	140
Acrylonitrile	5
Benzene	60
t-Butyl methyl ether	8000
Caprolactama	100
Carbon disulfide	800
Carbon monoxide	9 ppm and no greater than 2 ppm above outdoor levels
Carbon tetrachloride	40
Chlorobenzene	1000
Chloroform	300
Dichloromethane	400
Ethylbenzene	2000
Ethylene glycol	400
Formaldehyde	27
n-Hexane	7000
Naphthalene	9
Nonanala	13
Octanala	7.2
Particulates (PM 2.5)	35 (24-hr)
Particulates (PM 10)	150 (24-hr)
Phenol	200
Styrene	900
Tetrachloroethene	35
Toluene	300
Total volatile organic compounds (TVOC)	500
Trichloroethene	600
Xylene isomers	700

a. This chemical has a limit only where carpets and fabrics with styrene butadiene rubber (SBR) latex backing material are installed as part of the base building systems.

 

 

authority

Section 10 of the Construction Codes Approval and Amendments Act of 1986 (Act), effective March 21, 1987 (D.C. Law 6-216; D.C. Official Code § 6-1409 (2012 Repl.)) and Mayor’s Order 2009-22, dated February 25, 2009, as amended.

source

Final Rulemaking published at 61 DCR 3356 (March 28, 2014 – Part 2); as corrected by Errata Notice published at 61 DCR 5246 (May 23, 2014).

EditorNote

The District of Columbia Green Construction Code (2013) , referred to as the “Green Construction Code,” consists of the 2012 edition of the International Green Construction Code published by the International Code Council (ICC), as amended by the District of Columbia Green Construction Code Supplement (2013)(12 DCMR K). The International Green Construction Code is copyrighted by the International Code Council and therefore is not republished here. However, a copy of the text may be obtained at:http://publicecodes.cyberregs.com/icod/igcc/2012/index.htm?bu=IC-P-2012-000023&bu2=IC-P-2012-000019.