SLIDE 1 comfort - fresh air - affordability
mini-B Passive House
SEATTLE CENTRAL COMMUNITY COLLEGE:
Frank Mestemacher - Carpentry Instructor Carol Volpe – SCCC Curriculum Developer Robert Natoli – SCCC BIT Instructor Joel Bosshardt – SCCC BIT-WCC Liaison Darlene Moore - SCCC student VeraEve Giampietro – WCC & Graphics Support INDUSTRY AND TRADE SPONSORS: Tom Schneider - BEI Wet-Flash, Prosoco Kevin Nolan - Vapro-Shield Pat Nolan - Greenwood-Phinney Electric Mike Fletcher - Georgia-Pacific DAP Joe Beedy – Acrylitex Smooth Wall Don Olsen & Eric Palmer Painting Decorating & Drywall JATC Mark Maher – Cement Masons & Plasters Jim Charest – W. Washington Masonry Trades
Greg Hartman Illustrations
SUPER EFFICIENT SMALL DWELLING
Joseph Giampietro Architect & CPHC
www.miniBPassiveHouse.com
SLIDE 2
Outline
1. Design Concept – Why a PH – DADU? 2. Passive House Challenges 3. Construction Process 4. Tested Results / Projected Energy Use 5. Lessons Learned – What works, or not 6. What next?
SLIDE 3
- 1. Design Concept Drawings
COMFORT
Temperature -- Radiation – Air Movement
FRESH AIR
Clean – Filtered – Draft Free
AFFORDABILITY
First Cost – Life Cycle Cost -- Sustainable
Demonstrating Simple & Affordable Passive House
(living in a warmer climate zone)
SLIDE 4
Design Intent of Interior
Bed Loft - Kitchenette - ¾ Bath - 12 x 16 Living Area
SLIDE 5 Passive House Standard
- 1. Heat Loss Demand = 4.75 kBTU/sf-yr
- 4. Thermal Bridge Free Construction
(calculate negative & positive bridges)
“HEAT WITH A HAIR DRYER”
- 2. Primary Energy = 38.00 kBTU/sf-yr
- 5. Triple-Pane Glazing (recommended)
- 3. AIR TIGHT
- 6. HRV/ERV Efficiency = 75%+
Blower Door Test = 0.60 ACH50 (Heat/Energy Recovery Ventilation)
SLIDE 6
- 2. PH Challenges
- 1. Envelope to Floor Area Ratio of 5.7:1 = High Heat Loss
- 2. Lots of penetrations relative to Floor Area = More Infiltration
- 3. Primary Energy Use – all the functions of a larger home
SLIDE 7 Maxing Out the Options
- 1. Windows focused on south elevation – 43% of floor area
- 2. Thermal mass in concrete topping slab & 5/8 in GWB
- 3. Summer Shading to limit overheating
- 4. Evaluate Thermal Bridges of Intersections
- 5. Solar Hot Water Evacuated Tubes for Domestic Hot Water
- 6. No dishwasher –
No Washer – No Dryer
SLIDE 8 Thermal Bridge Inputs
Group # Qty User Deter- mined Length [ft] Subtrac- tion User- Determin ed Length [ft] Length l [ft] Input of Thermal Bridge Heat Loss Coefficient Y [BTU/(hr. ft.F)] 1 90deg wall corner exterior 21 4 7.40 29.60
90deg wall corner exterior
2 Roof Eave at Wall 21 1 38.00 38.00
Roof Eave at Wall
3 Roof at Gable End 21 4 8.00 32.00
Roof at Gable End
4 Roof at Ridge 21 1 31.00 31.00
Roof at Ridge
5 Perimeter at Ground 22 2 36.00 72.00
Perimeter at Ground
6 7 8
Therm Results for 2D Assembly Therm Results for Combined 1D Assemblies Resulting Psi
2D model 1D model A 1D model B Psi U L dT ULdT error U L dT ULdT error U L dT ULdT error PsidT dT Psi (Btu/h-f2F) (f) (F) (Btu/h-f) (%) (Btu/h-f2F) (f) (F) (Btu/h-f) (%) (Btu/h-f2F) (f) (F) (Btu/h-f) (%) (Btu/h-f) (K) (Btu/h-f-F) 90 degree corner at Mini-B 0.0202 5.75 36 4.1814 3.81 0.0208 4 36 2.9952 0.8 0.0208 4 36 2.9952
36
Ridge of Roof 0.0232 6.089 36 5.085533 5.34 0.0193 4.348 36 3.0209904 2.04 0.0193 4.348 36 3.02099 2.04
36
Eave at Roof/Wall 0.0222 6.946 36 5.551243 3.31 0.0205 4 36 2.952 0.1 0.0208 4 36 2.9952 0.84
36
Perimeter at Ground 0.0168 6.896 36 4.170701 9.9 0.0205 5.896 36 4.351248 0.61 0.0146 3.875 18 1.01835 4.76
36
6 in wall glazing
Light Shelf above Door 0.0481 6.156 36 10.65973 8.15 0.0189 0.5625 36 0.382725
na 0.11 1.519 36
6.01524
na
36
and big windows
0.3 0.333 36 3.5964
na 0.023 1.01
36 0.83628
can be ignored wind frame spacer
Thermal Bridges
SLIDE 9
Floor Portion of Perimeter Condition
SLIDE 10
Wall Portion of Perimeter Condition
SLIDE 11
Two D Therm Analysis – 0.033 BTU/hr.ft.F
SLIDE 12
Temperature Gradient at Perimeter
SLIDE 13
Wall Corner – 1 D Therm Result
SLIDE 14
Wall Corner – 2 D Result – 0.050 BTU/hr.ft.F
SLIDE 15
Wall Corner – Temperature Gradient
SLIDE 16
Wall Corner – Energy Flow – 0.050 BTU/hr.ft.F
SLIDE 17
Wall/Roof – Energy Flow – 0.011 BTU/hr.ft.F
SLIDE 18
Roof Ridge – Energy Flow – 0.026 BTU/hr.ft.F
SLIDE 19
Roof Ridge – Temperature Gradient
SLIDE 20
Light Shelf – 2D Analysis +0.00475 BTU/hr.sf.F
SLIDE 21 Thermal Bridge Inputs
Group # Qty User Deter- mined Length [ft] Subtrac- tion User- Determin ed Length [ft] Length l [ft] Input of Thermal Bridge Heat Loss Coefficient Y [BTU/(hr. ft.F)] 1 90deg wall corner exterior 21 4 7.40 29.60
90deg wall corner exterior
2 Roof Eave at Wall 21 1 38.00 38.00
Roof Eave at Wall
3 Roof at Gable End 21 4 8.00 32.00
Roof at Gable End
4 Roof at Ridge 21 1 31.00 31.00
Roof at Ridge
5 Perimeter at Ground 22 2 36.00 72.00
Perimeter at Ground
6 7 8
Therm Results for 2D Assembly Therm Results for Combined 1D Assemblies Resulting Psi
2D model 1D model A 1D model B Psi U L dT ULdT error U L dT ULdT error U L dT ULdT error PsidT dT Psi (Btu/h-f2F) (f) (F) (Btu/h-f) (%) (Btu/h-f2F) (f) (F) (Btu/h-f) (%) (Btu/h-f2F) (f) (F) (Btu/h-f) (%) (Btu/h-f) (K) (Btu/h-f-F) 90 degree corner at Mini-B 0.0202 5.75 36 4.1814 3.81 0.0208 4 36 2.9952 0.8 0.0208 4 36 2.9952
36
Ridge of Roof 0.0232 6.089 36 5.085533 5.34 0.0193 4.348 36 3.0209904 2.04 0.0193 4.348 36 3.02099 2.04
36
Eave at Roof/Wall 0.0222 6.946 36 5.551243 3.31 0.0205 4 36 2.952 0.1 0.0208 4 36 2.9952 0.84
36
Perimeter at Ground 0.0168 6.896 36 4.170701 9.9 0.0205 5.896 36 4.351248 0.61 0.0146 3.875 18 1.01835 4.76
36
6 in wall glazing
Light Shelf above Door 0.0481 6.156 36 10.65973 8.15 0.0189 0.5625 36 0.382725
na 0.11 1.519 36
6.01524
na
36
and big windows
0.3 0.333 36 3.5964
na 0.023 1.01
36 0.83628
can be ignored wind frame spacer
Thermal Bridges
SLIDE 22
WCC - Seattle Central Community College Frank Mestemacher
Carpentry Instructor
South Seattle Community College Georgetown Campus In Association with the SCCC Business Information Technology Department – Robert Natoli Instructor
SLIDE 23
BEI Training for R-Guard Installation
SLIDE 24
BEI Joint/Seam Filler at window joint
SLIDE 25
Cat-5 Wall Treatment at Window
SLIDE 26
Cat-5 Wall Treatment at North Wall
SLIDE 27
Floor Framing in place
SLIDE 28
Walls up – ready for Roof
SLIDE 29 BEI - Prosoco - Envelope
Air Tight Layer – 0.60ACH50
Will STUDENTS pass the test?
R-Guard / Wet-Flash Products Fast Flash – window wrap Joint/Seam Filler – cracks/joints Cat-5 - Weather Resistive Barrier Air Dam – window caulking 1 - VAPOR PERMEABLE 2 - SELF - HEALING 3 - AIR BARRIER Seals pipe & electrical penetrations
Exterior sheathed & weather sealed
SLIDE 30
Window Install with Air Dam
SLIDE 31
EPS continuous exterior insulation
SLIDE 32
Closing in the “Beer Cooler”
SLIDE 33 Vapro-Shield over EPS Insulation
“Slope Shield” on the Roof “Wall Shield” on Walls Sheds Water Vapor Permeable Serious 925 Windows U-11 Glazing U-18 Assembly 1x4 Cedar Furring Straps
(secured with 12 SIPS screws)
SLIDE 34 Summer Siding (& Roofing) Crew
Hardie Panel 12-inch Exposure Over Vented Rain Screen Air Gap 5/4 by 10 Cedar Trim Champion Standing Seam Metal Roofing (over 1x4 furring)
SLIDE 35
Summer crew enjoying the view
SLIDE 36 Insulation & Drywall Finish
Inside GP paperless drywall completes the Insulation Sandwich = R-53 3.5-inches of Blown-in Fiberglass & 9-inches of EPS foam
Continuous Ext. Insulation equals No Thermal Bridging Paperless Drywall by GP equals No Mold Potential (on GWB)
SLIDE 37
Plumbing & Electrical in stud walls
SLIDE 38
With Blown-in-Blankets
SLIDE 39
w/ Wall Board & floor prepped for concrete topping
SLIDE 40
Crew ready the Blower Door test
SLIDE 41
Is the door well sealed?
SLIDE 42
16 cfm = 0.38 ACH50
SLIDE 43
- 4. Design Energy Use / Tested Results
Blower Door Test #1 0.58 ACH50 (at framing stage) Blower Door Test #2
0.38 ACH50 (finished)
2009 WA Energy Code . Roof R-38 Walls R-21 Floor R-30 Windows U-0.30 Airtightness 5.25 ACH50 . Total Heat Demand / Year = 10,320 kBTU at Seattle City Light rate = $ 240.00 Mini-B Passive House . Roof R-53 Walls R-53 Floor R-74 Windows U-0.18 Airtightness 0.60 ACH50 . Total Heat Demand / Year = 1,256 kBTU at Seattle City Light rate = $ 30.00
COMFORT FRESH AIR LONG TERM AFFORDABILITY “HEAT WITH A HAIR DRYER”
SLIDE 44 PHPP Data Points/Results
Specific Heat Demand: (Monthly) kBTU/(sf.yr) As Pre-approved 4.55 Re-Submitted 10/9 4.34 With tested ACH50 4.09
- Freq. of Overheating 4%
- Aver. Shading Reduc. 50%
- Spec. Capacity Factor 18
(range is 11-36) Window Heat Loss 53% Wall Heat Loss 32% Roof Heat Loss 20% Ground Heat Loss 7% Total Heat Loss 112% Neg Thermal Bridges 12% Transmission Heat Losses 19.98 Ventilation Heat Losses 2.91 Total Heat Losses 22.89
- Avail. Solar Heat Gain 22.30
Internal Heat Gain 3.88 Free Heat 26.18 Utilization Factor 71% (Monthly) Net Monthly Heat Demand 4.34
Refrigerator 345 kWhr/yr Total Electricity 634 kWhr/yr
SLIDE 45
A. mini-B requires full solar exposure B. Would build one foot smaller in height to minimize cost of transport C. Need a smaller (less expensive) ERV D. Mineral Wool Fiber vs. EPS E. Therm analysis made an 11% difference F. It takes a big effort to go mini
SLIDE 46
- 6. Where do we go from here?
Phinney Neighborhood Association – North Seattle!
(after 6-months Mini-B will be for sale as a Backyard Cottage)
www.passivehouse.us www.passivehouse.com www.passivehouse-international.org www.phnw.org www.minibpassivehouse.com www.passivehouseprojects.wordpress.com
SLIDE 47 comfort - fresh air - affordability
mini-B Passive House
SEATTLE CENTRAL COMMUNITY COLLEGE:
Frank Mestemacher - Carpentry Instructor Carol Volpe – SCCC Curriculum Developer Robert Natoli – SCCC BIT Instructor Joel Bosshardt – SCCC BIT-WCC Liaison Darlene Moore - SCCC student VeraEve Giampietro – WCC & Graphics Support INDUSTRY AND TRADE SPONSORS: Tom Schneider - BEI Wet-Flash, Prosoco Kevin Nolan - Vapro-Shield Pat Nolan - Greenwood-Phinney Electric Mike Fletcher - Georgia-Pacific DAP Joe Beedy – Acrylitex Smooth Wall Don Olsen & Eric Palmer Painting Decorating & Drywall JATC Mark Maher – Cement Masons & Plasters Jim Charest – W. Washington Masonry Trades Robert
Greg Hartman Illustrations
SUPER EFFICIENT SMALL DWELLING
Joseph Giampietro Architect & CPHC
www.miniBPassiveHouse.com
