D.C. Mun. Regs. tit. 12, r. 12-K-A08
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 | ||
A108.3 | VOC emissions - ceiling systems | ||
A108.4 | VOC emissions - wall systems | ||
A108.5 | Total VOC limit | ||
A108.6 | Views to building exterior - 50percent | ||
A108.6 | Views to building exterior - 75percent | ||
A108.7 | Daylighting - 25percent | ||
A108.7 | Daylighting - 50percent | ||
A108.7 | Daylighting - 75percent | ||
A108.8 | Post-construction, pre-occupancy baseline IAQ testing | ||
A108.9 | Post-construction, pre-occupancy flush out | ||
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:
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:
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 daylitarea. 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.
Daylight prescriptive requirements.Daylitareas shall comply with Sections A108.7.1.1 or A108.7.1.2.
For determining the total daylitarea, any overlapping daylitareas shall be counted only once. Drawings clearly showing the daylitareas of the plan shall be provided as part of the permit application.
The total daylitarea shall be the sum of the area of all sidelighting daylitareas and the area of all toplighting daylitareas, except that sidelighting daylitareas shall not be included in the calculation of the area of toplighting daylitareas.
Sidelighting. The daylitarea 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 daylitarea 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 daylitarea 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).
Toplighting. The daylitarea 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 daylitarea 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.
Daylight performance requirements. Each daylitarea 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.
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.
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.
Daylight analysis. A daylight analysis shall:
Sky types. Registered design professionals shall use sky type B in determining the applicable effective aperture in Table A108.7.1.
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.
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) | ||
Sidelightingfrom fenestration in a wall [see Figure A108.7.1(1)] | Sidelightingfrom 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 POLLUTANTSa
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 |
D.C. Mun. Regs. tit. 12, r. 12-K-A08