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2019 Title 24: Upcoming Changes · 2019 Title 24: Upcoming Changes May 23, 2018 Nick Brown...
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2019 Title 24:Upcoming Changes
May 23, 2018
Nick Brown
President, Build Smart
Past President, Merlex Stucco
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Powerpoint Love-Hate
• “Bullets don’t inspire. Stories do”
• “If you choose to use slides, use more pictures than words.”
• “people recall and retain information more effectively when it’s presented in the form of a story, not bullet points”
• “…and don’t use bullet points. Ever.”
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Title 24 Walls: a Timeline
20082x4, R-13U=.102
20132x4, R-13+R-5U=.065
20162x6, R-19+R-5U=.051
20192x6, R-21+R-5U=.048
What ActuallyHappened
Title 24 ResidentialPrescriptiveStandard
100%
50%
% one-coat
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2019 Title 24 Changes
2019 code cycle starts 1/1/2020
This is the “net-zero” code cycle
Solar panels prescriptive standard
QII prescriptive standard
Wall U-factor changes (minor)
Window U/SHGC changes
Battery storage credit
Hospitals now covered by Nonres
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Embedded in the Title 24 Process
Every 3 years, the CEC’s team has to find 20-30% energy savings that:
Payback within 30 yearsIndustry won’t vetoBuildableTechnology is ready
CASE teams propose changesStakeholder meetingsCEC evaluates CASE reports
CEC puts out 45-day language
CEC puts out 15-day language
Final version approved
Through this process, all the low-hanging fruit become energy code standard
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How Walls Played Out in 2019
Original CASE Report came out recommending 1.5” foam in CZ 1 & 11-16
I interviewed many of you about this; as a result cost of 1.5” foam walls doubled, cost-effectiveness went down, we raised issues of longer fasteners, window bucks, waterproofing. Building industry likely spoke out against, and CEC chose not to go that far
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Wall Changes - Residential
CASE Report proposed R-19+R-7.5 (1.5” GPS) in Central Valley (.043)
Settled on R-21+R-5 (.048) in 1-5,8-16
Was R-19+R-5 (.051)
Biggest news for Residential Walls is other parts of the code
QII prescriptive standard
Windows .30/.23
Solar panels prescriptive standard
Attics R-19 under roof deck
Fan watt draw down from .58 to .45 W/cfm
Door U-factor .20 (was .50)
When other options are taken away, HPWs are more widely used.
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How Modeling Software Works
Planned House
Actual design features
Climate Zone 10 (Riverside)
Standard House
Prescriptive Package features
Climate Zone 10
2x6 R-19 walls
R-38 attic
QII
16 SEER, 93 afue HVAC
Windows .30/.29, 25% glazing
Whole House fan
2x6 R-21+R-5 walls
R-38+R-19 attic
QII
14 SEER, 78.5 afue HVAC
Windows .30/.23, 20% glazing
Whole House fan
Cool Roof Tile
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How Modeling Software Works
Planned House
Actual design features
Standard House
Prescriptive Package features
5,980 kWh
578 therms
32.96 TDV
6,198 kWh
560 therms
34.84 TDV
BUILDING COMPLIES
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Residential Software: now vs 2020
Same house run against proposed 2019 standards:EDR is ~2.4 points too high. 3 kW PV array is 23 EDR (meets Minimum Required). We must bring down Efficiency EDR to comply
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Finer Points
EDR (Energy Design Rating) is ratio of building energy use to 2006 code building, where 100 is 2006 code efficiency and 0 is net-zero.
PV panels must produce enough electricity to cover electric usage only
Natural gas load does not need to be covered by PV
Exceptions to PV requirement:
Roof too small, too shaded
Batteries that shift grid electric usage from peak to off-peak count toward the EFFICIENCY EDR target
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Changes – High-Rise & Commercial
Multifamily >3 storiesLighting allowance reduced to LED wattages (was easy credit)
Shifted from commercial ventilation standard to residential ventilation standard =>30% lower airflow
Balanced ventilation required or blower door test verifying low leakage between units
MERV 13 air filtration
Wall U-factor .051 (R-19+R-5)
CommercialLighting allowance reduced to LED wattages (was easy credit)
Wall U-factors remain same
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How Much PV Will Be Required?
Formula is based on sqft & bedrooms
PV=CFA/1000*A+Units*B
Exceptions:
1) Roof area<80sf
2) Reduced 25%
w/ battery
3) Community PV
2000 sqft SF Home
per Home
CZ Min kW PVW/sqft
4 2.4 1.2
7 2.3 1.1
10 2.7 1.3
12 2.6 1.3
14 2.7 1.4
15 4.6 2.3
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Current Residential Wall Standards
.065
.048
No Change(Metal-framed.069/.105/.048)
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Assemblies that Meet Standards
NOTE: Commercial buildings and Metal-framed High-Rise Residential have different U-factors
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Other Alternatives to Comply
More efficient HVAC systems, water heaters, windows, etc.
Higher performance attics incl. unvented
Reduced glazing, window shading
Drainwater heat recovery credit (NEW!) ~3%
Battery credit subs for efficiency & PV
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Can Builders Still Use Traditional Walls?
Status Quo: what other measures in home would it take to compensate for not meeting prescriptive standard for HPWs (2019 code)?
To use traditional 2x4 R-13 walls, a typical production home in Irvine required:
16 SEER HVAC, QII, Tankless .95, Attic R-38+R-19, Whole house fan, Cool roof, Windows .27/.23
If using 2x6 R-19 walls, same home required:16 SEER HVAC, QII, Tankless .82, Attic R-38, Windows .27/.23
If using 2x6 R-19+R-5 walls, could save on other upgradesDifferent in all climate zones
Bats in Cavity
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3-coat over CI – also possible
Table appears in CEC’s Residential Compliance Manual
Specifies how to fasten lath over foam sheathing
Various cladding weights
11 psf = 3-coat stucco
Other tables for metal framing, furred assemblies
You can have your 7/8” stucco plus CI
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Case Study #1: Riverside CZ10
Typical 2016 code-compliant 2-story, 2,500 sqft, 4 BR
R-19 walls, R-38+R-13 attic
16 SEER, 93 afue HVAC
Efficiency Upgrades Needed:
Whole house fan, R-38+R-19 attic, CRRC roof tile, R-19+R-4 walls
PV Needed: 3 kW (10 panels)
2016 code
2019 code
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Before & After Upgrades
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Case Study #1: Riverside Battery
Adding 7.5 kWh battery replaces R-19+R-4 wall upgrade, cool roof tile, whole house fan, 16 SEER A/C upgrade, and 1 solar panel
Battery subs for efficiency measures AND PV
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Cost of Compliance
Other Options
R-4 CI walls 16 SEER 93 afue furnace QII Refrig Chg Tankless .95
Climate Zone
Compliance %
Improvement*
Compliance %
Improvement*
Compliance %
Improvement*
Compliance %
Improvement*
Compliance %
Improvement*
Compliance %
Improvement*
3-Oakland 7.6% 0.1% 11.5% 9.7% 0.0% 4.5%
4-Paso Robles 6.0% 1.4% 7.9% 9.1% 1.0% 3.3%
7-San Diego 4.3% 1.3% 4.5% 5.9% 0.7% 6.3%
8-Irvine 4.5% 5.0% 3.8% 8.9% 3.7% 4.2%
9-L.A. 4.9% 4.5% 3.3% 9.5% 4.3% 2.7%
10-Riverside 5.0% 4.3% 3.6% 9.8% 3.8% 2.6%
11-Red Bluff 5.7% 3.7% 4.4% 9.3% 4.1% 1.4%
12-Sacramento 6.1% 2.8% 6.5% 10.2% 3.1% 2.2%
13-Fresno 5.3% 3.9% 3.9% 8.8% 4.7% 1.4%
Average 5.5% 3.0% 5.5% 9.0% 2.8% 3.2%
Estimated Cost ~$1,100 ~$500 ~$500 ~$750 ~$250 ~$350
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The House is a Competition
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Contact Us
Nick Brown
(714) 984-3397
www.buildsmartgroup.com