D.C. Mun. Regs. tit. 12, 12-I405

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Current through Register Vol. 71, No. 49, December 6, 2024

Section 12-I405 - ADDITIONAL EFFICIENCY PACKAGE

R405.1Requirements.

New buildings shall comply with at least one of the following:

1. Enhanced HVAC performance in accordance with Section R405.2.

2. Enhanced Building Envelope in accordance with Section R405.3.

3. Enhanced Air Leakage and Heat Recovery Ventilation in accordance with Section R405.4.

4. Enhanced Water Heating System in accordance with Section R405.5.

Exception:Alterations are exempt from Section R405.

TABLE R405.2

Equipment Type	Efficiency
Split and Packaged Air Conditioners	= 15 SEER ^a
Split and Packaged Air Source Heat Pumps	= 15 SEER ^a, = 9.0 HSPF^b
Gas-fired Furnace	= 90% AFUE^c and Furnace Fan Efficiency = 2.0% or Electronically Commutated Motor (ECM)
Gas-fired Boiler	= 90% AFUE^c
Ground Source Heat Pump	= 17.1 EER^d and = 3.6 COP^e

a. SEER - Seasonal Energy Efficiency Ratio

b. HSPF - Heating Seasonal Performance Factor

c. AFUE - Annual Fuel Utilization Efficiency

d. EER - Energy Efficiency Ratio

e. COP - Coefficient of Performance

R405.3Enhanced Building Thermal Envelope.

Building Thermal Envelope shall comply with Table R405.3 in addition to Table R402.1.2.

TABLE R405.3 INSULATION AND FENESTRATION REQUIREMENTS BY COMPONENT

FENESTRATION	Windows = 0.24 U-Factor ENERGY STAR Compliant Doors
SKYLIGHT U-FACTOR	0.45 U-Factor
GLAZED FENESTRATION SHGC	0.40 Solar Heat Gain Coefficient (SHGC)
CEILING	R60
MASS WALL	U-factor less than or equal to .035 or R-19 cavity + R-10 continuous, or R-13 in cavity + R-15 continuous, or R-25 continuous
WOOD FRAME	U-factor less than or equal to .035 or R-19 cavity + R-10 continuous, or R-13 in cavity + R-15 continuous, or R-25 continuous
METAL FRAME WALL	U-factor less than or equal to .035
CONTINUOUS SLAB INSULATION	R10 continuous

R405.4Enhanced Air Leakage and Heat Recovery Ventilation.

Buildings shall meet the minimum air leakage requirements of Table R405.4 and install a heat or energy recovery ventilation system.

TABLE R405.4 AIR LEAKAGE TESTING REQUIREMENTS

New construction
Single family detached, two family attached (duplex), townhouses, flats	2 ACH50
Dwelling units in Multifamily buildings 3 stories and less	.25 CFM50/SF enclosure area of each unit or 2 ACH50

R405.5Efficient Appliances and Water Heating.

All refrigerators, freezers, dishwashers, clothes washers, and ceiling fans must be ENERGY STAR Qualified, and water heater(s) shall meet the minimum efficiency requirements of Table R405.5.

TABLE R405.5 MINIMUM EFFICIENCY FOR WATER HEATERS

Equipment Type	Efficiency
Gas Storage Water Heaters	>= 0.90 Energy Factor (EF)
Tankless Water Heaters	>= 0.95 Energy Factor (EF) with electronic ignition
Electric Water Heaters	>= 2.2 Energy Factor (EF)

D.C. Mun. Regs. tit. 12, 12-I405

Final Rulemaking published at 67 DCR 5679 (5/29/2020); amended by Final Rulemaking published at 68 DCR 007412 (7/30/2021)