Roy Passivhaus Yakima County, WA

Ryan Lurie George Ostrow 27 March 2015

PHnw6 Spring Conference

DESIGN OVERVIEW

SITE

house location

SITE

hills to south and west blueberry farm

modern farmhouse

INSPIRATION

HOUSE ELEVATIONS

south

northeast

BUILDING SECTIONS

VAULTED AT LIVING WING roof = R80 (15.5 polyiso) walls = R76 (24” cellulose) floor = R100 (28” EPS)

BUILDING SECTIONS

ATTIC AT BEDROOM WING roof = R77 (30” cellulose) walls = R76 (24” cellulose) floor = R100 (26” EPS)

EARLY PLANNING

• building square to compass • no windows at north • major rooms, biggest

windows at west and south • main entrance on the east

FENG SHUI

Bagua chart

• main entrance on the southwest is best for homeowner • office in the Prosperity corner • master bed placed against solid wall with clear view of bedroom door • no corner windows • no vaulted ceiling in master bedroom • separate sitting area for owners retreat • sink and cooktop not to be opposite each other • building rotated so that neither side faces north or east

by Gisela Stehr, Emerald Feng Shui Institute

gross floor area 2605 ft2

Treated Floor Area 2260 ft2

FINAL HOUSE PLAN

CONSTRUCTIONOVERVIEW

Fastfoot footing

monopour Fastfoot with ICF stemwall

Helix Microbar 50% less steel than rebar

440 lbs versus 875 lbs

plumbing and radon piping

6” washed gravel capillary break

first layer EPS foam beneath slab (16”)

air and vapor and radon barrier

second layer EPS foam beneath slab (12”) total foam beneath slab: 28”

6” concrete slab

parge coat on stem wall independent gray and black water waste lines

outer 2x10 stud wall with structural sheathing/air barrier on interior side

ceiling joists beneath attic roof

air barrier at attic roof

S.S. Roy ready for sail

3x10 rafters, A/C plywood sheathing, sanded and stained with Rubio Monocoat

air barrier detail at perimeter of vaulted roof

structural steel beam pocket

pony wall for insulation and rafter tail attachment

at vaulted roof

4x4 purlins and first layer of roof insulation

at vaulted roof

2 additional layers of 4.5” polyiso with staggered seams

at vaulted roof

dummy rafter tails and gable end outriggers attached to 4x4 purlins

3.5” deck screw versus 400mm Heco-Unix screw

raised heel (30”) roof trusses at attic roof

lowered end truss with notched truss blocking for 4x4 rafter tail extensions

progress as of mid March 2015

COST FOR PASSIVHAUS

COST PREMIUM FOR PH SPECIFIC ITEMS

• windows triple glazed

• sub slab insulation extra 25”

• walls double stud

• polyiso roof insulation extra 9”

• ventilation HRV

• construction air sealing

• construction management

• PHPP and Therm calculations

• PHA certification fees

• INCREMENTAL COST FOR THIS PASSIVHAUS

$10,000

$16,000

$25,000

$4,500

$ 4,000

$10,000

?

$6,100

$3,400

$79,000

COST PREMIUM FOR PH SPECIFIC ITEMS

• PHPP and Therm calculations

• PHA certification fees

• INCREMENTAL COST FOR THIS PASSIVHAUS

$6,100

$3,400

$9,500

A WINDOW CHANGE PARABLE

WINDOW CHANGES

Thermowood Uf 1.09 Ug 0.51 g 0.50

300 fiberglass Uf 1.26 Ug 0.75 g 0.54

LOSSES GAINS LOSSES GAINS

$45,000 $37,000

YAKIMA VS.

SEATTLE

2-1/2 hour drive to big cities

materials and labor from both sides of Cascades

Material Labor

materials and labor from both sides of Cascades

CLIMATE

eastern Washington

summer 10°F hotter winter 10°F colder

solar +20%

REALLY ? 2 FOOT THICK WALLS ?

… yes indeed !

SURFACE AREA TO FLOOR AREA

ROY PASSIVHAUS

ONE STORY HOUSE

TWO STORY HOUSE

THREE STORY HOUSE

TWO STORY ROW HOUSE

THREE STORY DOME

4.2

3.9

3.1

2.4

2.2

1.9

MOISTURE MANAGEMENT

TWO FOOT THICK WALLS

condensing surface

PLYWOOD AT EXTERIOR PLYWOOD 10” INBOARD

water rises over time

water content at condensing surface

PLYWOOD AT EXTERIOR PLYWOOD 10” INBOARD

water stable over time

TWO FOOT THICK WALLS

temp drops to dew point temp stays above dew point

temperature at condensing surface

PLYWOOD AT EXTERIOR PLYWOOD 10” INBOARD

TWO FOOT THICK WALLS

moisture and temp sensors

in roof inside walls

ACTUAL MEASUREMENT

temperature vs. dew point at condensing surface

air temperature (max): 63°F air temperature (min): 31°F

temperature

dew point

de

gree

s F

ACTUAL MEASUREMENT

humidity at condensing surface

air temperature (max): 63°F air temperature (min): 31°F

% r

elat

ive

hu

mid

ity

ACTUAL MEASUREMENT

humidity at four wall orientations

questions & answers