The Courtland Place Passive Project

The
Courtland
Place
Passive
Project
CPPP
PHnw Conference Sept 16, 2011
Black Bird Builders, llc
What is “Passive House”?
Passive not Active
--Energy Efficiency Design Standard
-!Max 4.75 kBTU/sq.ft. per
year for heating
-!Max 4.75 kBTU/sq.ft. per
year for cooling
-!Max 38 kBTU/sq.ft. per year
total energy consumption
-Utilize energy modeling software to maximize
use of “free” energy
--Specifications:
-Max 0.6 ACH50
-Continuous balanced ventilation
with energy recovery
-Thermal Bridge Free
Construction
The Idea: Design the Building to meet a very low
level of energy consumption while providing
superior occupant health and comfort
“Haus” -- House
“House”
House
“House” = Building
Why Passive House?
-Site-specific energy-engineered
-Super-efficient
-Flexibility of means, methods and
materials
-Excellent interior air quality
The Idea: build the first
Single-Family
Passive House (PH) in WA
The Project: A new 2 ! storey,
house with 1 bedroom attached
Accessory Dwelling Unit
2589 s.f. North Amer. convention
2338 s.f. comparable sizing
1895 s.f. PH Treated Floor Area
The Location: a vacant lot in
Rainier Valley, South Seattle (next
door)
The Owner, The Designer,
The Builder, The CPHC,
The Go-fer:
the one wearing too many hats:
me
Priorities
-Materials with lower Carbon footprint & Global Warming Potential
-Methods of lesser impact
-Livability
-Affordability
-Replicability
Pics of outside of house
Why Here? Why Now?
-Supportive community
-Experimentation
-Demonstration
-Ideal environment for PH
-2030 Challenge
-It’s past time
Phase 1: Ground
-Shallow foundation
-Slab on Grade
-Completely thermally isolated
by 4” to 11” of EPS foam
(R-20 to R-49.5)
Start Date January 5, 2010
Thermal Bridge at Foundation Perimeter Spreadsheet
Phase 2: Envelope
-14” wall cavity, 20” roof cavity
-Larsen trusses from standard
2x stock and plywood
-Advanced framing techniques
-Full-depth roof truss heels
-Exterior sheathing = Homasote 440
-Interior sheathing = 7/16” OSB
Platform Framing
Cascadia Windows with Cardinal Glazing Units
CoG =U-0.143 EoG =U-0.195
SHGC = 0.57
V.T. = 0.69
Frame = U-0.261 to 0.289
Overall =0.180 (fixed), 0.199 (tilt/turn)
Doors: Standard ThermaTru, R-8 with Cardinal
Glazing
Phase 3: Moisture Management
-Exterior assembly designed for vapor
permeability
-Rainscreen drainage plane
-Additional ventilation strips at horizontal
lap locations
-Siding: T&G Western Red Cedar and
Hardie Panel
-Roofing: Painted Galvalume Standing Seam
Pic of metal window sill
Phase 4: Insulation
-EPS foam where necessary
-XPS foam where essential
-Dense pack BIBS Fiberglass R-4.12 per in.
Walls 14” (R-54.7)
Roof 18 !” (R-68.5)
Pic of bibs
Phase 5: Air Sealing
-Continuous OSB Air Barrier with
minimal penetrations (16 total)
-Thorough sealing: glues, tapes,
gaskets, foam, EPDM and caulk
Result: 0.70ish ACH50 ;(
Thank You
For more information on Passive House:
-Passive House Northwest (PHnw): phnw.org
-Passive House Institute US (PHIUS): passivehouse.us
-passivehousecentral.us
For more information on the CPPP:
-Linda’s Blog: existingresources.wordpress.com
-THTSTW: thehousethatsavedtheworld.com
-Someday soon (when the project’s done and I have a
moment): blackbirdbuilders.com
Thanks:
-Linda, Albert, Markus,
Hayden, Joe, Wayne,
James and everyone at
PHNW
-Carissa, Philippe, Stu,
Greg, Neil, Nick, Megan,
Dale (x2), Cale, Scott,
Mark, Brad, Hilary, Albert
& all who’ve helped/
volunteered
-Mike & Nathan at
THTSTW
-Partner’s Insulation, Siga,
Homasote, Seal-Once,
Wet-Flash, Ultimate Air,
Renewability Energy, Small
Planet Workshop,
Cascadia Windows & the
suppliers who’ve gone the
extra distance