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2019 Standards


May 9, 2018 Business Meeting – Language Adoption

Jan 1, 2020 Implementation Date Any projects that apply for permit on or after Jan 1, 2020 will be subject to the 2019 Standards


Information and documents available at:

Lowrise Residential Envelope Above Deck Roof Insulation


No longer a Prescriptive option

Below deck insulation is still an option

Location ducts and AHU in conditioned space is still an option

Can still use above deck insulation with performance modeling

Below Deck Roof Insulation

Roof Insulation

New insulation requirements below the roof deck

Increased from R-13 to R-19

Multi-Family table allows R-13 in Zones 10 and 16.

Wall Insulation

Lower U-Factors in Climate Zones 1-5, 8-16

U-factor reduced to 0.048

Typically 2x6 with R-21 cavity + 1”Rigid (R-5)

Above Grade Mass Walls

Offers two options for compliance:

Interior insulation R-13Continuous (R-17 in Zone 16)

Exterior insulation R-8 Continuous(R-13 in Zone 16)

Mass wall defined as a density > 45 lbs/cuft

Below Grade Walls

Offers two options for compliance:

Interior insulation R-13 Continuous (R-15 in Zone 16)

Exterior insulation R-5 Continuous (R-10 in Zones 14-15, R-19 in Zone 16)

Quality Insulation Installation

Quaility Insulation Installation

Quality Insulation Installation (QII) is now required on most residential buildings under Prescriptive compliance.

Will set the baseline in performance

Applies to New Construction as well as Additions > 700 sq.ft.

Climate Zone 7 not required for multi-family (Coastal San Diego)



Maximum U-Factor = 0.30

Maximum SHGC = 0.23 No requirement in Zones 1,3,5 & 16

Zone 16 is now treated like the other heating climate zones, not like the cooling climate zones (encourages passive design)

Opaque Doors

Opaque Doors

Subject to a maximum NFRC rated UFactor requirement of 0.20

Basically an R-5 insulated door.

Same in all Climate Zones

Includes doors to outside and to unconditioned spaces

Does not apply to doors from house to garage.

Doors with 25% or more glass now treated as fenestration (windows).

Ducts & Filters

Ducts and air filters

2016 introduced requirement for ducts in conditioned space to be insulated to R-4.2 when in conditioned space.

2019 introduces an exception that allows for ducts in support platforms and wall cavities to be uninsulated.

Minimum 2” Filter (larger face area formula will allow for 1”).

Minimum MERV 13 filtration.

Filter not required if 10 feet or less of ductwork

Fan Performance

Fan Performance

Fan wattage must be HERS tested on forced air system with cooling to be no more than 0.45 W/cfm if the unit is a Gas Furnace.

Other air handlers such as heat pumps and fan coils can still be 0.58 W/cfm.

Small Duct High Velocity Forced Air Systems must test at 250 cfm per ton and no more than 0.54 W/cfm

Single Family IAQ Fans

IAQ Fans

Indoor Air Quality Fans required to provide higher airflow as follows:

Qtot = 0.03 x Afloor + 7.5 x (Nbr + 1)


Qtot = total required ventilation rate, cfm

Afloor = dwelling-unit floor area, ft2

Nbr = number of bedrooms (not to be less than 1

Multi-Family IAQ and Leakage

Multi-family IAQ Leakage

Multi-family dwelling units must include either:

A balanced ventilation system

A continuously operating supply ventilation system

A continuously operating exhaust ventilation system

If using a continuous system, it requires HERS blower door testing to show no more than 0.3 cfm/sf leakage based upon the envelope surface area.

Range Hoods

Range Hoods

Range hoods must be HERS inspected in the field to verify:

Minimum airflow per ASHRAE 62.2 (100 cfm)

Maximum sound ratings per ASHRAE 62.2 (3.0 sones)

Other airflow options are provided in ASHRAE 62.2 for continuous ventilation.

HERS Verifications

HERS Verifications

Heat pumps that are high efficiency (HSPF > 8.2) must be HERS verified in the field.

Heat pump heating capacity values at 47 degree and 17 degree ratings must be HERS verified in the field when non-default sizes are used in performance modeling.

Whole House Fan airflow rate and rated wattage must be HERS verified in the field.

Central Fan Integrated Cooling systems must be HERS verified in the field

Photovoltaic Systems

Photovoltaic Systems

A PV system is now required for all single family and multifamily buildings

DC Rating = (CFA x A) / 1000 + (NDwell x B)

CFA = Conditioned floor area

NDwell = Number of dwelling units

A = Adjustment factor from Table 150.1-C

B = Dwelling adjustment factor from Table 150.1-C

Examples: 2,000 ft2 home in LA – 2.6 kW system 30-unit apartment building in Oakland – 47 kW

PV Exceptions

PV Exceptions

Domestic Hot Water

Domestic Hot Water

Applicable to units serving individual dwelling units

Any number of gas or propane tankless water heaters

A large gas or propane water heater (>55 gallons) and windows with a UFactor of 0.24 or less and one of the following:

Compact hot water distribution HERS verified Compact

All piping insulated and HERS verified

A drain water heat recovery system HERS verified

Domestic Hot Water

Water Heater

A Heat Pump water heater located in the garage or home and:

Compact hot water distribution HERS verified plus

A drain water heat recovery system HERS verified

Or In Zones 2 – 15 increase PV size by 0.3 kW

Or in Zones 1 & 16 increase PV size by 1.1 kW

Or a Tier III NEEA rated unit (must increase the PV size by 0.3 kW in Zones 1 & 16)

Luminaire Requirements

Luminaire Requirments

Night Lights, Step Lights and Path Lights require a vacancy sensor if > 5 watts or > 150 lumens

Light sources internal to drawers, cabinetry or linen closets require a vacancy sensor if > 5 watts or > 150 lumens unless they are equipped with controls that automatically turn the lighting off when closed.


HVAC Controls

Bathrooms, Garages, Laundry Rooms & Utility Rooms

At least one luminaire controlled by either:

A Vacancy Sensor

A Vacancy Sensor


For more information, please call us now at (209)538-2879.