the Rating Industry Eric Makela NBI | Jim Meyers - SWEEP A - - PowerPoint PPT Presentation

A look at the 2021 IECC Residential Provisions for the Rating Industry

Eric Makela – NBI | Jim Meyers - SWEEP

A look at the 2021 IECC Residential Provisions for the Rating Industry

3

Hello!

I am Eric Makela Director of Codes at NBI – New Buildings Institute I am Jim Meyers

Director of the Buildings Program

SWEEP – Southwest Energy Efficiency Project Presentation template by SlidesCarnival

New Buildings Institute (NBI)

▫ NBI is redefining energy efficiency in the built environment. ▫ Program Areas: ▪ Best practices in new and existing buildings ▪ Continuous code and policy innovation ▪ Zero energy leadership and market development

Four Foundations to Zero Carbon Policy

https://newbuildings.org/making-the-transition-from-zero-energy-to-zero-carbon-building-policies/

SWEEP

▫ The Southwest Energy Efficiency Project (SWEEP) promotes greater energy efficiency in Arizona, Colorado, Nevada, New Mexico, Utah, and Wyoming. ▫ Focus includes buildings, industrial, utility programs, transportation electrification ▫ SWEEP has program support in 5 states

Todays Discussion Points

▫ 2021 IECC ▫ Envelope ▫ Testing ▫ System Changes ▫ Water heat ▫ Lighting

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▫ EV Ready ▫ Packages ▫ ERI ▫ Electrification Ready ▫ Zero Energy

First Look

▫ ICC – governmental consensus process ▫ Approximately 300 proposals ▫ More stringency ▫ New requirements

DMW Magazine

1. Envelope Changes

Highlights of significant changes for the 2021 IECC Envelope table AND REQUIREMENT

Insulation

Insulation

▫ Clarifying language about cavity insulation only for cavity, and continuous only for continuous (R402.1.3 R-value computation) ▫ + to &, ci to exterior ▫ Cavity only and exterior only options

Insulation

▫ Clarifying language about cavity insulation only for cavity, and continuous only for continuous (R402.1.3 R-value computation) ▫ + to &, ci to exterior ▫ Cavity only and exterior only options

Insulation

▫ 2021 IECC ▪ Increased slab insulation requirements

Insulation

▫ 2021 IECC Ceiling Insulation

Windows

▫ Fenestration u-factors ▪ From 0.32 to 0.30 in CZ 3 & 4 ▫ SHGC requirement now in CZ 5 & 4M ▪ From NR to 0.40 SHGC

Windows

▫ Area weighted average maximum values (Section 402.5) ▫ Maximum U-factor ▪

U- 0.40 CZ 4 & 5

▪

U- 0.35 CZ 6 through 8

▫ Maximum SHGC requirement ▪

SHGC 0.40 CZ 1 through 3

2018 IECC

Windows

▫ Requirement for altitude and windborne debris ▫ Maximum U-factor of 0.32 in CZ 4M, CZ 5-8 ▫ Vertical fenestration only ▫ > 4000 feet elevation ▫ Windborne debris regions when required - IRC R301.2.1.2 ▪

US Atlantic Coast and Gulf of Mexico

▪

Hawaii, Puerto Rico, Guam, USVI, Samoa

▪

Pacific Coast not included

Windows

▫ Requirement for altitude and windborne debris ▫ Maximum U-factor of 0.32 in CZ 4M, CZ 5-8 ▫ Vertical fenestration only ▫ > 4000 feet elevation ▫ Windborne debris regions when required - IRC R301.2.1.2 ▪

US Atlantic Coast and Gulf of Mexico

▪

Hawaii, Puerto Rico, Guam, USVI, Samoa

▪

Pacific Coast not included

“

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2. Air Barrier & Testing

Highlights of significant changes for the 2021 IECC Testing and Air Barrier requirements

Air Barrier and Insulation Table

Air Barrier and Insulation Table

Air Barrier and Insulation Table

▫ There was no air barrier criteria under plumbing ▫ Adds criteria for air sealing ▫ Removes current insulation language and accounts for insulation exterior to the wiring/plumbing/

• bstruction

Air Barrier and Insulation Table

▫ One inch or less – air sealed

Air Barrier and Insulation Table

▫ Recessed light fixtures installed in the building thermal envelope shall be air sealed in accordance with Section R402.4.5 ▫ Duct shafts

Air Barrier and Insulation Table

▫ Foundations – basement, crawl space, slab

Leakage

▫

New definition for “Dwelling Unit Enclosure Area”

▪

The sum of the area of ceiling, floors, and walls separating a dwelling unit’s conditioned space from the exterior or from adjacent conditioned or unconditioned spaces. Wall height shall be measured from the finished floor of the dwelling unit to the underside of the floor above.

▫

Accepted alternative - Air leakage rate of 0.30 cfm/ft2 of enclosure area (ceiling, floors, walls)

▫

Applies to attached single and multifamily buildings AND

▫

Homes < 1500 ft2

GreenBuildingAdviso

Leakage

▫

New definition for “Dwelling Unit Enclosure Area”

▪

The sum of the area of ceiling, floors, and walls separating a dwelling unit’s conditioned space from the exterior or from adjacent conditioned or unconditioned spaces. Wall height shall be measured from the finished floor of the dwelling unit to the underside of the floor above.

▫

Accepted alternative - Air leakage rate of 0.30 cfm/ft2 of enclosure area (ceiling, floors, walls)

▫

Applies to attached single and multifamily buildings AND

▫

Homes < 1500 ft2

GreenBuildingAdviso

Leakage

▫ New section for multifamily testing ▫ R402.4.1.2.1 Buildings other than detached one-family dwellings ▫ Multi-zone buildings, two family dwellings, and townhouses shall be tested as a single zone, without inducing equal pressures in adjacent zones, or shall be tested as individual dwelling units. ▫ Numeric ACH – now 3.0/5.0 ACH (was three/five ACH)

Leakage

▫ Testing is mandatory ▫ The building or dwelling unit shall be tested for air leakage. ▫ Max leakage rate for any compliance path </ 5.0 ACH (ERI, performance) ▫ Leakage rate is added and prescriptive ▪ </5.0 ACH in CZ 1-2 ▪ </3.0 ACH in CZ 3-8

Green Building Advisor

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3. System Changes

Highlights of significant changes for the 2021 IECC Ventilation, ducts, mechanical

Duct Testing

▫ New requirement for duct leakage levels for any compliance path ▫ The maximum total leakage rate for ducts in any building or dwelling unit under any compliance path shall not exceed 8.0 cfm per 100 SF conditioned floor area ▫ Testing at rough or post construction ▫ Duct testing required for ducts in conditioned space

Duct Testing

▫ New requirement for duct leakage levels for any compliance path ▫ The maximum total leakage rate for ducts in any building or dwelling unit under any compliance path shall not exceed 8.0 cfm per 100 SF conditioned floor area ▫ Testing at rough or post construction ▫ Duct testing required for ducts in conditioned space

Duct Insulation

▫

Supply and return ducts

▪

Insulated to R-8 for ducts >/3.0 in

▪

Insulated to R-6 for ducts <3.0 in

▪

When outside conditioned space

▫

In floor cavities

▪

Air barrier between unconditioned space and the duct

▪

Min R-19 separating duct from unconditioned space

▫

In exterior walls

▪

Continuous air barrier between unconditioned space and duct

▪

Min R-10 separating duct from outside sheathing

▪

Fully insulated to drywall side

Mechanical Ventilation

▫ Update to whole-house fan efficacies ▫ Updates to latest ENERGY STAR version

Mechanical Ventilation

▫ Update to whole-house fan efficacies ▫ In addition to other fan types

Mechanical Ventilation

▫ Applies to CZ 7 & 8 ▫ ERV or HRV required ▫ Must be balanced ▫ >/ 65% sensible heat recovery efficiency

Mechanical Ventilation

▫

Ventilation systems - tested for minimum flow rates

▫

According to mfr instructions

▫

Or flow hood or box, flow grid, or other

▫

Used at inlet terminals/grilles, outlet terminals,

• r in ducts

▫

Written report submitted to building official

4. Water Heat

Highlights of significant changes for the 2021 IECC Hot water compactness, equipment efficiency and HERS H20

Water Efficiency

▫ Hot water (RE162-19) ▪ Compactness of hot water systems (Section R405 only)

Water Efficiency

▫ Hot water (RE162-19) ▪ Compactness of hot water systems (Section R405 only)

Water Efficiency

▫ Hot water ▪

Sources of hot water include water heaters, circulations loops heat trace pipe

▪

Rectangle shall include hot water source and termination points

▪

Shown on drawing plans – computed to nearest SF

▪

If more than one water heater then calculate separately and add together

▪

Basement counted as story if water heater located

Compares to HERS H20

▫

Evaluates indoor and outdoor water use

▫

Based on BSR/RESNET/ICC Std 850

▫

Additional program requirements to include:

▪

Certification of raters | Quality Assurance | Approval of Software

▫

Ratable features - e.g. shower heads, faucets, toilet flush, irrigation

▫

Other attributes - house size, hot water distribution layout, pipe insulation

▫

Inspection Checklist | Inspection Guidance Document

Water Heat

▫

• 1. Storage gas water heater with a uniform energy

factor (UEF) that meets the requirements of Table R403.5.1

▫

• 2. Storage electric water heater utilizing not less than

1.0 kW of on-site renewable energy

▫

• 3. Heat pump water heater with a UEF >/ 2.0

▫

• 4. Tankless water heater

▫

• 5. Grid-enabled water heater

▫

• 6. Solar water heating system

having a solar fraction of >/ 0.5

“

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5. Lighting

Highlights of significant changes for the 2021 IECC New lighting requirements – efficacy and controls

High Efficacy Lighting in Dwelling Units (Lamps)

▫

Issue

▪

The definition of “high-efficiency lighting” for dwelling unit lighting efficiency has not been updated since the 2009 IECC.

▪

Significant changes in the market due to increased federal minimums and greater availability/affordability of LED and

• ther highly efficient lighting.

▫

Code Change

▪

Require minimum efficacy of 70 lm/W for all connected lamps, or

▪

Light fixtures with an efficacy of not less than 45 lm/W (note that this is under review)

High Efficacy Lighting in Dwelling Units (Controls)

Code Change ▫

Requires all permanently installed lighting fixtures to be controlled with an:

▪

Dimmer

▪

Occupancy sensor

▪

Other control installed into the fixture

▫

Exceptions

▪

Bathrooms

▪

Hallways

▪

Exterior lighting fixtures

▪

Lighting designed for safety or security

Leviton Controls

Exterior Lighting Requirements

▫

Code Change

▪

Requires exterior lighting to comply with the commercial exterior lighting requirements

▪

Maximum watts/sf (or linear ft)

▪

Lighting controls

▪

Exceptions

▪

One and two family residential

▪

Lighting that already complies with the high efficacy lighting requirements

▪

Solar powered lamps

▪

Lighting controlled by motion sensors

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6. Electric Vehicles

Highlights of significant changes for the 2021 IECC Electric Vehicles infrastructure joins the I-codes

Electric Vehicles

▫ New construction ▫ One- to two-family dwellings and townhouses ▫ Provide at least one EV Ready Space ▪ Not required where no parking spaces are provided ▫ Definition EV Ready Space – A designated parking space which is provided with one 40-ampere, 208/240-volt branch circuit

Electric Vehicles

▫ New construction ▫ One- to two-family dwellings and townhouses ▫ Provide at least one EV Ready Space ▪ Not required where no parking spaces are provided ▫ Definition EV Ready Space – A designated parking space which is provided with one 40-ampere, 208/240-volt branch circuit

Electric Vehicles

▫ New construction ▫ Multifamily dwellings (three or more units) ▫ EV Capable – Panel capacity and space to support 40-ampere 208/240-volt branch circuit, including raceways, underground and surface mounted

7. Efficiency Packages

Highlights of significant changes for the 2021 IECC New Efficiency Package Options

Additional Efficiency Packages

▫

Code Change

▪

Requires one additional efficiency package to be selected if complying prescriptively (includes REScheck)

▪

Package options

▪

Enhanced Envelope Performance – Requires proposed total UA to be 95% of UA for minimally compliant building. SHGC is required to be 95% of required maximum SHGC

▪

More Efficient HVAC Equipment

▪

≥95 AFUE Furnace and 16 SEER AC

▪

≥ 10 HSPF / 16 SEER air source HP

▪

≥ 3.5 COP ground source HP

Additional Efficiency Packages

▪

Package options (continued)

▪

Reduced Energy Use in Service Water Heating

▪

≥ 82 EF fossil fuel water heating

▪

≥ 2.0 EF electric service water heating

▪

≥ 0.4 Solar Fraction solar water heating system

▪

More Efficient Duct Thermal Distribution System

▪

100% of ducts and air handlers located in within the building thermal envelope

▪

100% if ductless thermal distribution system or hydronic located entirely in the building thermal envelope

▪

100% if the duct thermal distribution system located in in conditioned space

▪

Improved Air Sealing and Efficient Ventilation System

▪

≤ 3.0 ACH50 with ERV or HRV

▫

Impact on Other Compliance Options

▪

Section R405 – Computer Simulation

▪

Comply with Annual Energy Cost and select one Additional Efficiency Package, or

▪

Comply with the proposed design being ≤ 95% of the annual energy cost of the standard reference design

▪

Section R406

▪

The ERI shall be at least 5% less than the ERI targets

Additional Efficiency Packages

“

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8. ERI – Energy Rating Index

Highlights of significant changes for the 2021 IECC Index score change, backstop change, documentation and more

Energy Rating Index Approach

▫

Code Changes

▪

ERI targets reduced to 2015 IECC levels

▪

Sets the new envelope “backstop” to 1.15 X UA for the 2021 IECC

▪

Eliminates the cap on SHGC

▪

Cap on credit for on-site renewables to 5% of total energy use

▪

Requires that verification for the mandatory measures be conducted by jurisdiction or third party inspection agency

Energy Rating Index Approach (Adjusted for Flex Packages)

Climate Zone Energy Rating Index Impact of Package Options (5% Reduction) Actual Modified ERI Score 1 57 52 2.6 49.4 2 5752 2.6 49.4 3 5751 2.6 48.5 4 6254 2.7 51.3 5 6155 2.8 52.3 6 6154 2.7 51.3 7 5853 2.7 50.4 8 5853 2.7 50.4

Energy Rating Index Approach

▫

Code Changes

▪

Modification of required documentation

▪

Compliance documentation for the proposed design

▪

Building address

▪

Analysis and reporting author

▪

All inputs entered to produce the results for reference and rated homes

▪

Certificate showing proposed design ERI is ≤ to reference ERI and document the energy specifications for the building

▪

Confirmed compliance documents for the built dwelling unit

▪

All reporting required for proposed design except:

▪

Energy features that were confirmed to be in the house

▪

Size and production of renewable systems installed in the house

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9. Electrification Ready

Highlights of significant changes for the 2021 IECC Electrification requirements

Gas or Propa ne DHW

3 ft 3 ft 240 volt 30 or 40 amp Branch Circuit Gas Range

Electrification Ready

▫

Dedicated electrical receptacle within 3 feet of gas appliances

▫

Provide space in electrical panel labeled SPARE

▫

Single pole circuit breaker labeled w/ Future 240V Use

▫

Water heater space min of 3 ft. X 3 ft. X 7ft.

10. Zero Energy

Highlights of significant changes for the 2021 IECC New Zero Energy Appendix

Zero Energy Residential

CLIMATE ZONE ENERGY RATING INDEX not including onsite power ENERGY RATING INDEX including onsite power (as proposed) 1 43 2 45 3 47 4 47 5 47 6 46 7 46 8 45

a The building shall meet the mandatory requirements of Section R406.2, and the

building thermal envelope shall be greater than or equal to the levels of efficiency and SHGC in Table R402.1.2 or Table R402.1.4. of the 2015 International Energy Conservation Code.

Residential Zero Energy Appendix Proposal

▫ ERI not including Onsite Power ▪ ERI Scores before onsite renewable were selected based on: ▪ Analysis of HERS scores nationwide ▪ Survey of HERS scores for model high-performance

homes

▪ Modeling performed for the ASHRAE 90.2 committee ▪ U.S. DOE Zero Ready Homes ▪ Houses needed to be buildable

Residential Zero Energy Proposal

▫ Zero Energy Appendix linked directly to RESNET Standard 301 not Section R406 of the IECC ▪ Eliminates issues with “game playing” with the C406 code language to try and modify Standard 301 ▪ Includes ability to use on-site or off-site renewables to meet score of zero (0)

Residential Zero Energy Proposal

▫

On-Site Power Calculation

▪

ERI value including onsite power production (OPP) calculated in accordance with RESNET/ICC 301

▫

Off-site Power Calculation

▪

ERI value including onsite power production calculated in accordance with RESNET/ICC 301 with the OPP in Equation 4.1.2

• f RESNET/ICC 301 adjusted as follows

▪

Adjusted OPP = OPP + CREF + REPC

▫

Where:

▪

CREF (Community Renewable Energy Facility power production): The yearly energy, in kilowatt hour equivalent (kWh ), contracted from a community renewable energy facility that is qualified under applicable state and local utility statutes and rules, and that allocates bill credits to the rated home.

▪

REPC (Renewable Energy Purchase Contract power production): The yearly energy, in kilowatt hour equivalent (kWh ), contracted from an energy facility that generates energy with photovoltaic, solar thermal, geothermal energy, or wind systems, and that is demonstrated by an energy purchase contract or lease with a duration of not less than 15 years.

Residential Zero Energy Proposal

“

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Thanks!

Eric Makela ericm@newbuildings.org NBI – New Buildings Institute Jim Meyers

jmeyers@swenergy.org

SWEEP – Southwest Energy Efficiency Project

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