Green Building and Green Points Program Incorporating HERS home energy rating system into your desig

1
Green Building and Green Points Program
Incorporating HERS (home energy rating system)
into your design and building process

• Presented by
• Brian Fuentes - fuentesdesign
• Michael Broussard - Home Performance Solutions

2
1

• New Mandatory Green Building Requirements
• 2008 Green Points Update
• HERS and Design
• How HERS works

2
3
4
3
1
Green Building Mandatory Requirements
4

• NEW homes require
• 1) HERS (Home Energy Rating System) Index
• 2) Accrual of a required Green Points
• 3) Deconstruction Plan and Construction Waste
  Recycling form (FEB 19)
• measures used to improve HERS score cannot be
  used again for Green Points

5

• Remodels and additions over 500 sf. require
• Home Energy Audit
• 2) Accrual of a mandatory number of Green
  Points
• 3) Deconstruction Plan and Construction Waste
  Recycling form
• 4) If replaced, new furnaces 90 AFUE (direct
  vent)
• Lighting Efficiency Requirements
• measures used to improve HERS score cannot be
  used again for Green Points

6
2
Green Points
7
Green Points Categories

• Green Points required based on size of project
• Site Development
• Building Rehabilitation
• Waste Management
• Energy Efficiency
• Solar
• Water Efficiency
• Material Efficient Frame and Structure
• Sustainable Products
• Indoor Air quality
• Homeowner Information Binder
• Design Process and Innovation

• measures used to improve HERS score cannot be
  used again for Green Points

8
Green Points Requirement Levels
HERS required
HERS optional
9
(No Transcript)
10
3
HERS in Design
11
What is a HERS Index?
ENERGY index for your HOME (mpg) 3rd Party
Certified, RESNET (Residential Energy Services
Network) COMPUTER MODEL combined with FIELD
TESTING
12
What is a HERS Index?

• Computer Energy Model creates From Plans
  Certificate at Permit Submittal
• Model and Field Testing provide Final Certificate
  with Certificate of Occupancy

13
City Compliance Levels

• The City of Boulder has adopted the 2006 IECC
  Code
• HERS index 100 2006 IECC
• HERS index 70 is equivalent to 30 more efficient
  than 2006 IECC

14
City Compliance Levels
Courtesy SustainablyBuilt.com
15
The HERS Process
start
1
Initial meeting with HERS rater optional
Schematic design Create best design based on
available knowledge and site analysis
2
SD HERS model optional
3
Design Development if needed, adjust based on
initial model
4
CD HERS model projected or from plans
certificate
5
Construction Documents
6
7
Permit
HERS pre drywall Thermal Bypass Inspection,
optional pressure testing
8
Begin Construction
9
10
Correct Mistakes
Reqd HERS Field Testing
11
HERS Final Certificate
13
Certificate of Occupancy
12
finish
16

• Initial Meeting
• Size HERS Green Points

1
17
Schematic Design with HERS in mind
2

• Size
• Shape / Orientation
• Insulation / Air Tightness
• Glazing / Shading
• Thermal Mass / Surface Area
• Mechanical / Renewables
• Sunspaces

18

• Size smaller is more efficient
• HERS measures VOLUME and floor area

http//www.cres-energy.org/about_tsh_2005.htmlZer
o_Energy_Habitat_For_Humanity_Home
19
Simple Shape / South Orientation
long axis east westbalance south orientation
with exterior surface area Simple shapes Minimize
cantilevers, corners, projections
20
R- value
R 1/U ft2 F h/Btu
21
Insulate Tight, Ventilate Right
Know Your Building Science Moisture Air barriers
/ Thermal Boundaries Drainage Planes Insulation
enclosed on all sides
HRV Heat recovery Ventilator
22
Glazing Let it in, or keep it out
South HIGH SHGC (solar heat gain coefficient) U
Value, lt .35
North East West LOW SHGC U Value, Lowest possible
Frame included, not just glass!
23
Thermal MASS

• Examples
• Double Gypsum board ceilings
• Polished concrete floors
• Interior Mass walls (6 max thickness)
• SURFACE AREA!
• Mean Radiant Temperature (average of surrounding
  surfaces)

24
MechanicalHeating Cooling Systems

• Furnaces 90 AFUE or better
• Sealed combustion appliances will also reduce
  overall air leakage and have better indoor air
  quality.
• Passive cooling is preferable
• Better HERS scores for
• Attic Radiant Heat Barriers
• Landscaping that shades (windows shading
  factor)
• Air Conditioners should be 15 SEER or better for
  a higher HERS Score.
• Evaporative Coolers are 40 SEER

25
Domestic Hot Water Systems

• Accounts for ¼ of utility bills especially with
  multiple occupants.
• Sealed combustion increases efficiency, consider
  tankless

26
Renewable EnergyPhotovoltaics
Type of roof and attachment Area
required Shading Orientation, horizontal,
vertical 10-50 deg. slope photovoltaics Inverter
space next to Electrical Panel (or battery
space)
27
Renewable EnergySolar HOT Water
Type of roof and attachment Area
required Shading Orientation, horizontal,
vertical 50-90 deg. slope for solar hot
water Tank storage space
28
Renewable EnergyGeothermal Heat Pump
PV (photovoltaic) power to run pumps Area for
digging or drilling Mechanical space for
equipment Up to 7 HERS score increase
Vertical Closed Loop
Horizontal Closed Loop
29
Attached Sunspace
30
The HERS Process
start
1
Initial meeting with HERS rater optional
Schematic design Create best design based on
available knowledge and site analysis
2
SD HERS model optional
3
Design Development if needed, adjust based on
initial model
4
CD HERS model projected or from plans
certificate
5
Construction Documents
6
7
Permit
HERS pre drywall Thermal Bypass Inspection,
optional pressure testing
8
Begin Construction
9
10
Correct Mistakes
Reqd HERS Field Testing
11
HERS Final Certificate
13
Certificate of Occupancy
12
finish
31
Projected or From Plans Model
3
6

• End of Schematic Design or Construction
  Documents, HERS rater runs Model as is.
• IF TOO HIGH, Architect makes changes based on
  from Plans Model prior to Permit Submittal
  (with new From Plans model).
• HERS rater tests final model, provides
  projected HERS rating prior to for From Plans
  certificate.

32
Construction Documents
6

• Specify air tightness during pre-drywall
  inspection
• Design for mechanical ventilation to meet ASHRAE
  62.2 (required ventilation at less than lt.35
  NACH)
• Consider Balanced Ventilation (Heat or Energy
  Recovery Ventilators in line with forced air or
  separately)

33
4
How HERS works
34
No leaks!
35
HERS Tests
11
Insulation Inspection Thermal Bypass
Checklist Blower Door Testing Duct Blaster
Testing
36
6 side Rule Insulation Enclosed all sides
Insulated Floor Above Garage
37
Insulation Inspection
9
GRADE III incorrect!
38
Insulation Inspection
9
GRADE III incorrect!
39
Insulation Inspection
9
GRADE I good!
40
Cantilever Insulation
9
Proper installation of insulation under a
cantilevered floor
Insulation settling away from sub-floor
41
Rim Joist / Band
9
42
Kneewall Insulation
9
- Examples of properly blocked and air sealed
attic knee walls
43
Attic Eaves with Trusses
9
Install Baffles
44
Garage Band Joist Carrier
9
No gaps
i
- Examples of properly blocked and air sealed
attic knee walls
45
Slab Edge Insulation
9
46
Piping shaft Penetrations
9
Caulking around piping penetration
Typical piping penetrations leaving large holes
47
Attic Insulation
9
48
Insulated Concrete Forms(ICF)
9
49
Structurally Insulated Panels(SIPS)
9
50
Fireplace Leakage
9
51
Thermal Bypass Checklist
9

• Energy Analysts find where insulation voids exist
  and communicate to the builder through this
  checklist before drywall is installed.
• It confirms
• Complete air sealing at all key areas
• Alignment of thermal and pressure barriers
• Complete coverage at all insulation cavities
• It allows for any repairs before the drywall is
  installed

52
Blower Door Testing
9
11

• House pressurized to 50 pascals, measure air
  leakage in CFM (cubic feet per minute)
• Adjusted to NACH (Natural Air Changes Per Hour)
  in REMRate
• Measures overall air leakage
• Mechanical Ventilation required less with less
  than .35 NACH

53
Duct Blaster Testing
9
11

• Ducts pressurized to 25 pascals, measure air
  leakage in CFM (cubic feet per minute)
• Measures air leakage in Supply and Return, or
  seperately
• If done pre drywall, can correct problems!

54
The HERS Process
start
1
Initial meeting with HERS rater optional
Schematic design Create best design based on
available knowledge and site analysis
2
SD HERS model optional
3
Design Development if needed, adjust based on
initial model
4
CD HERS model projected or from plans
certificate
5
Construction Documents
6
7
Permit
HERS pre drywall Thermal Bypass Inspection,
optional pressure testing
8
Begin Construction
9
10
Correct Mistakes
Reqd HERS Field Testing
11
HERS Final Certificate
13
Certificate of Occupancy
12
finish
55
Final HERS Certificaterequired for Certificate
of Occupancy
12
56

• Thanks!
• Questions?
• Brian_at_fuentesdesign.com
• Mike_at_hpsenergy.com