passive house 2 - phnw-home projects ... window-to-wall ratio window-wall ratio impact on cooling...
TRANSCRIPT
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Passive House 2.0
LESSONS LEARNED FROM THE FIRST GENERATION OF MULTI-UNIT PASSIVE HOUSE BUILDINGS IN B.C.
PASSIVE HOUSE NORTHWEST, APRIL 6 2017
MONTE PAULSEN, PHI-ACCREDITED BUILDING CERTIFIER
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RDH Building Science
New Construction
Façade Engineering
Enclosure Consulting
Passive House
Existing Buildings
Repair, Renewal & Rehabilitation
Reserve & Depreciation Reports
Research & Forensics
RDH Labs in Waterloo
200+ staff in eight cities
Seattle
Portland
Vancouver
Victoria
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RDH Passive House
PHI-accredited Building Certifiers
Vancouver
Certified Passive House Consultants
Seattle, Portland, Victoria, Vancouver
Current projects
Townhome developments
Multi-unit residential
Mixed-use midrise
Infill office buildings
High-rise feasibility studies
First Nations housing
Arctic worker housing
Monitoring & research
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Passive House 2.0
Lessons from the first generation of multi-unit Passive House in B.C.
Simple shapes cost less
Exterior insulation can take the weight
Big buildings bring big thermal bridges
Why Passive House is growing in B.C.
BC Passive House factory in Pemberton
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Lesson #1:
Simple shapes cost lessBernhardt Contracting, Victoria
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First Certified Passive House in Victoria
Bernhardt Contracting
Photo: Bernhardt Construction
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North Park Passive House: First multi-unit PH building in B.C.
Bernhardt Contracting
Photo: Bernhardt Construction
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North Park Passive House: Strata units sold above-market rate.
Bernhardt Contracting
Photo: Bernhardt Construction
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North Park Enclosure Monitoring Study
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Complicated back-framing in the dormers
Bernhardt Contracting
Photo: Bernhardt Construction
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10 kWh / m2a10 kWh / m2a
+0.5 kWh+0.5 kWh
+0.5 kWh+0.5 kWh
2/3 of labor costs
1/3 of labor costs
Graphic courtesy Mark Bernhardt
Bernhardt Contracting
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Six units of surface. One unit of floor. (One person.)
Why shape matters
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6:1 surface/floor ratio. (Or, 6 walls, 1 body.)
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Two units of floor. 3:1 surface/floor ratio. (Three walls/body.)
The two-storey building is twice as efficient
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Three units of floor. 2:1 surface/floor ratio. (Two walls per body.)
Multi-storey buildings are far more efficient
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303 Pender = 1:1 surface/floor
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1:1 surf/floor ratio Increase of 10%
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Mary Street duplexes: Simple shapes.
Bernhardt Contracting
Image: Bernhardt Construction
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“It’s all about the shape. Both for performance and cost.
Decorate the envelope, don’t decorate with the envelope.”
~ Mark Bernhardt
Bernhardt Contracting
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Lesson #2:
Exterior insulation can take the weightBritco, Langley
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A sweater so thick you don’t need a funace
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=
The Sweater: Six inches of Exterior Mineral Wool
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Bella Bella Passive House: Canada’s first modular Passive House building
Britco
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Long screws through vertical strapping and rigid insulation creates a ladder truss
Huh? Nothing but screws?
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What about really long screws?
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Vinyl, Metal, Wood Siding
Stucco
Thin Stone Veneer
Thick Stone Veneer, Very Heavy Cladding
0.00 0.13 0.25 0.38 0.51 0.64 0.76
0.0
2.3
4.5
6.8
9.1
11.3
13.6
0
5
10
15
20
25
30
0 5 10 15 20 25 30
Displacement (mm)
Load
(kg)
Load
(lb)
Displacement (1/1000")
3 inch 6 inch 9 inch 12 inch
What about really long screws?
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Vinyl, Metal, Wood Siding
Stucco
Thin Stone Veneer
Thick Stone Veneer, Very Heavy Cladding
0.00 0.13 0.25 0.38 0.51 0.64 0.76
0.0
2.3
4.5
6.8
9.1
11.3
13.6
0
5
10
15
20
25
30
0 5 10 15 20 25 30
Displacement (mm)
Load
(kg)
Load
(lb)
Displacement (1/1000")Long Screw through 3/4" strapping and 9" of Mineral Wood into Stud
8d Nail through 3/4" Rainscreen Strapping No Exterior Insulation
How does this compare to nail-on strapping?
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What happens if you miss a stud?
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UniverCity at Simon Fraser University
SFU UniverCity & Local Practice Architecture
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Photo: Britco
Fifty large apartments in a northern climate zone
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Exterior rockwool: 12- to 15-inches deep
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Lesson #3:
Big buildings bring big thermal bridgesEvaluating a 10-story concrete residential tower
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Ten-story concrete building on infill site
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Passive House is feasible
Target insulation values:
Above Grade Walls: R-25 to R-30
Below Grade Walls: R-20 to R-30
Below slab: R-20 to R-30
Windows U-0.14
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Passive House is feasible
Target insulation values:
Above Grade Walls: R-25 to R-30
Below Grade Walls: R-20 to R-30
Below slab: R-20 to R-30
Windows U-0.14
Structure is critical strategic choice
Core & column vs perimeter
Decision drives TB strategy
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Exposed slab edges are thermal bridges
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Exposed slab edges are thermal bridges
Psi values of greater than 1 one W/mK are common
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More than a kilometer of slab edge in 10-story bldg
Eliminating exposed slab edges critical to affordability
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More than a kilometer of slab edge in 10-story bldg
If exposed, slab edges would more than double the heat demand
Eliminating exposed slab edges critical to affordability
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Order of magnitude in difference
0
5
10
15
20
25
30
35
40
0.0 0.2 0.4 0.6 0.8 1.0
Heat
ing D
em
and (
kW
h/m
2a)
Slab Edge Linear Transmittance (Btu/hr ft F)
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Above Grade wall options (R-25 to R-30 eff.)
Exterior Insulated Steel Stud or Concrete
Integrally insulated, precast sandwich or ICF
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Optimization of Enclosure Performance
0
5
10
15
20
25
30
35
10 15 20 25 30 35 40
Hea
ting
Dem
and
(kW
h/m
2a)
Overall Area Weighted R-Value (hr ft² F/Btu)
Weighted overall effective R-value for entire enclosure (including windows)
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0
5
10
15
20
25
0
5
10
15
20
25
0% 10% 20% 30% 40% 50% 60% 70% 80%
Co
olin
g d
em
and
(kW
h/m
²a)
Heati
ng
dem
and
(kW
h/(
m²a
)
Window-to-Wall Ratio
Window-Wall Ratio impact on cooling
WWR for the residential floors:
› )
Uw-0.13g-0.3
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Vancouver High Rise Feasibility
60-storey residential tower
30,000 m² of TFA
10,000 m² glazing
› Triple-paned curtain wall
› Target R-6 (+/-)
12,000 m² opaque wall
› Target R-27 (+/-)
Modified balcony design required
Glass elevator lobby discussed
Ventilation penetrations an issue
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Vancouver High Rise Feasibility
Primary Energy Renewable has been the defining challenge on larger projects
Strategies include:
Negotiate ventilation
Elevator efficiency
DHW efficiency
Reduce fan & pump loads
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“If you simply must build something thermally stupid, for God’s sake, build it with wood.”
~ Scott Kennedy
Cornerstone Architecture
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Why is Passive House growing so quickly?When governments count carbon, priorities change
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Last century, we counted energy efficiency
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On the coldest night of the year,
each unit in the Bella Bella Passive House
will require a heat load equal to
just six 100-watt lightbulbs
Last century, we counted energy efficiency
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Last century…
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Transportation
40% 32% 28%
IndustryBuildings
This century, we count GHG emissions
Data: Natural Resource Canada
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Buildings: 55% of urban GHG emissions
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Buildings: 77% of government GHG emissions
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City of Vancouver now counts GHG emissions
Greenest City 2020
All buildings constructed from 2020 to be carbon neutral in operations
Renewable City Strategy
100% of energy used is renewable by 2050
New buildings required to use 100% renewable energy by 2030 or earlier
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=
Gas furnaces and boilers are the source of GHGs
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=
The bigger the building, the bigger the boiler
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Passive House buildings do not need boilers
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Where there is no boiler, there are no emissions
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=
Where there is no boiler, there are no emissions
This is why Passive House is growing
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Passive House is the cheapest way to cut GHGs
VBBL 2014 CODE HOUSE
Source: City of Vancouver Passive House Costing Study
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Passive House is the cheapest way to cut GHGs
VBBL 2014 CODE HOUSE PASSIVE HOUSE
$25,000 more to build
75% GHG reduction for lifetime of the building
Source: City of Vancouver Passive House Costing Study
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Redistribution of cost of a six-story MURB
LEED & ASHRAE+
Delete hydronic system
Delete industrial boilers
Delete concrete floors
Realign consultants
PASSIVE HOUSE
Upgrade windows/doors
Increase insulation values
Upgrade HRV systems
Upgrade air barrier
Electric baseboard heat
Total redistribution = Est. $600,000
Net Passive House premium est. 3%
Estimates by Peak Construction, Summer 2016
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Vancouver Zero Emissions Building Plan
One- and two-family homes:
2020: 70% GHG reduction
2025: Zero Carbon & 30 kWh/m2/a
Four- to six-storey MURBs:
2020: Passive House performance
2025: Zero Carbon
High-rise:
2020: Near Passive House
2025: Zero Carbon
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Passive House is cost-effective for “missing middle” housing, offices, schools.
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Anthem Properties & Integra Architecture
North Vancouver: Up to 250 townhomes
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Permit applications for more than 105 Passive House townhomes (Mar 2017)
North America’s largest Passive House district
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Step 4 is not yet defined, but draft text looks a bit like Passive House
B.C. climate plan points toward Passive House
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0
0.5
1
1.5
2
2.5
2009 2010 2011 2012 2013 2014 2015 2016
Cum
ulat
ive
Squa
re F
oota
ge (M
illion
s)
Cumulative Square Footage
Dual Certified - Projected PHIUS - Projected PHI - Projected PHIUS - New PHI - New PHIUS - Cumulative PHI - Cumulative
Growth of Passive House in North America
Source: Pembina Institute
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0
0.5
1
1.5
2
2.5
2009 2010 2011 2012 2013 2014 2015 2016
Cum
ulat
ive
Squa
re F
oota
ge (M
illion
s)
Cumulative Square Footage
Dual Certified - Projected PHIUS - Projected PHI - Projected PHIUS - New PHI - New PHIUS - Cumulative PHI - Cumulative
Growth of Passive House in North America
Vancouver
Source: Pembina Institute
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“The number and size of certified Passive House projects has seen a rapid increase in North America in the last five years, and we expect this growth to accelerate.”
~ Pembina Institute
Source: Pembina Institute
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Discussion + Questions
FOR FURTHER INFORMATION PLEASE VISIT
rdh.com/new-construction/passive-house/
OR CONTACT