comfort - fresh air - affordabilitymini-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

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?

1. Design Concept Drawings

COMFORTTemperature -- Radiation – Air Movement

FRESH AIRClean – Filtered – Draft Free

AFFORDABILITYFirst Cost – Life Cycle Cost -- Sustainable

Demonstrating Simple & Affordable Passive House(living in a warmer climate zone)

Design Intent of Interior

Bed Loft - Kitchenette - ¾ Bath - 12 x 16 Living Area

Passive House Standard1. 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)

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

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

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)]

190deg wall

corner exterior21 4 7.40 29.60

90deg wall corner exterior

-0.050

2Roof Eave at

Wall21 1 38.00 38.00

Roof Eave at Wall-0.011

3Roof at Gable

End21 4 8.00 32.00

Roof at Gable End-0.050

4 Roof at Ridge 21 1 31.00 31.00 Roof at Ridge -0.026

5Perimeter at

Ground22 2 36.00 72.00

Perimeter at Ground-0.033

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 0 -1.809 36 -0.05025

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 -0.95645 36 -0.02657

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 -0.39596 36 -0.011

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 -1.1989 36 -0.0333

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 -0.17092 36 -0.00475

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

Floor Portion of Perimeter Condition

Wall Portion of Perimeter Condition

Two D Therm Analysis – 0.033 BTU/hr.ft.F

Temperature Gradient at Perimeter

Wall Corner – 1 D Therm Result

Wall Corner – 2 D Result – 0.050 BTU/hr.ft.F

Wall Corner – Temperature Gradient

Wall Corner – Energy Flow – 0.050 BTU/hr.ft.F

Wall/Roof – Energy Flow – 0.011 BTU/hr.ft.F

Roof Ridge – Energy Flow – 0.026 BTU/hr.ft.F

Roof Ridge – Temperature Gradient

Light Shelf – 2D Analysis +0.00475 BTU/hr.sf.F

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)]

190deg wall

corner exterior21 4 7.40 29.60

90deg wall corner exterior

-0.050

2Roof Eave at

Wall21 1 38.00 38.00

Roof Eave at Wall-0.011

3Roof at Gable

End21 4 8.00 32.00

Roof at Gable End-0.050

4 Roof at Ridge 21 1 31.00 31.00 Roof at Ridge -0.026

5Perimeter at

Ground22 2 36.00 72.00

Perimeter at Ground-0.033

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 0 -1.809 36 -0.05025

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 -0.95645 36 -0.02657

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 -0.39596 36 -0.011

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 -1.1989 36 -0.0333

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 -0.17092 36 -0.00475

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

3. Construction Team

WCC - Seattle Central

Community College

Frank Mestemacher

Carpentry InstructorSouth Seattle Community College

Georgetown Campus

In Association with the SCCC

Business Information Technology

Department – Robert Natoli

Instructor

BEI Training for R-Guard Installation

BEI Joint/Seam Filler at window joint

Cat-5 Wall Treatment at Window

Cat-5 Wall Treatment at North Wall

Floor Framing in place

Walls up – ready for Roof

BEI - Prosoco - EnvelopeAir Tight Layer – 0.60ACH50Will 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

Window Install with Air Dam

EPS continuous exterior insulation

Closing in the “Beer Cooler”

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)

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)

Summer crew enjoying the view

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

equalsNo Mold Potential (on GWB)

Plumbing & Electrical in stud walls

With Blown-in-Blankets

w/ Wall Board & floor prepped for concrete topping

Crew ready the Blower Door test

Is the door well sealed?

16 cfm = 0.38 ACH50

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-38Walls R-21Floor R-30Windows U-0.30Airtightness 5.25 ACH50 .Total Heat Demand / Year = 10,320 kBTU

at Seattle City Light rate = $ 240.00

Mini-B Passive House .Roof R-53Walls R-53Floor R-74Windows U-0.18Airtightness 0.60 ACH50 .Total Heat Demand / Year = 1,256 kBTU

at Seattle City Light rate = $ 30.00

COMFORTFRESH AIRLONG TERM AFFORDABILITY

“HEAT WITH A HAIR DRYER”

PHPP Data Points/ResultsSpecific Heat Demand:

(Monthly) kBTU/(sf.yr)As Pre-approved 4.55Re-Submitted 10/9 4.34With 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 19.98Ventilation Heat Losses 2.91Total Heat Losses 22.89

Avail. Solar Heat Gain 22.30Internal Heat Gain 3.88Free Heat 26.18

Utilization Factor 71%(Monthly)

Net Monthly Heat Demand 4.34

Spec. Energy Demand 37.1Refrigerator 345 kWhr/yrTotal Electricity 634 kWhr/yr

5. Lessons Learned

A. mini-B requires full solar exposure

B. Would build one foot smaller in heightto 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

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.orgwww.phnw.org www.minibpassivehouse.com www.passivehouseprojects.wordpress.com

comfort - fresh air - affordabilitymini-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