Air Tightness Requirements of the Passive House...
Transcript of Air Tightness Requirements of the Passive House...
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Air Tightness Requirements of the
Passive House Standard
Mike O’Donnell & Scott Pusey
Steven Winter Associates
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Air Barrier Association of America (ABAA) is a Registered Provider with The American Institute of Architects Continuing Education Systems. Credit earned on completion of this program will be reported to CES Records for AIA members. Certificates of Completion for non-AIA members are available on request.
This program is registered with the AIA/CES for continuing professional education. As such, it does not include content that may be deemed or construed to be an approval or endorsement by the AIA of any material of construction or any method or manner of handling, using, distributing, or dealing in any material or product.
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Overview of Presentation
• Brief Overview of Passive House
• PH Air Tightness Requirements
• Design Phase
• Construction Phase QA/QC
• Case Studies
– The House at Cornell Tech
– St. John Neumann
– Beach Green North
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What is Passive House (PH)?
• PH is a building standard
• The most rigorous energy efficiency
certification available
• Performance based approach
• Attention to insulation continuity and
reduction of thermal bridges
• Emphasis on balanced ventilation
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What can be certified PH?
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Passive House Criteria
Criteria Threshold
Space heating/cooling demand 4.75 kBtu/ft2 yr
Whole building energy demand* 38.0 kBtu/ft2 yr
Air infiltration 0.6 ACH@50**
Frequency of overheating*** <10%
* Source
** PHI Limit
*** Must not be exceeded if no mechanical cooling is present.
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PH Design Principles
• Continuous Insulation
• Minimize Thermal Bridging
• Airtight Construction
• Energy Recovery Ventilation
• Optimal Solar Orientation and Shading
The SURE House
Winner of the 2015
D.O.E. Solar Decathlon
www.surehouse.org
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PH AIR TIGHTNESS
REQUIREMENTS
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PHI vs PHIUS: DifferencesRequirement PHI PHIUS Notes
Comfort criteria Mandatory Recommended Leads to triple pane
windows in NYC for PHI
Whole building
energy demand
/ft2 of conditioned envelope /person
Heating demand Same for all climates Changes based on
climate
Cooling demand Changes based on latent
load from climate and
occupant density & internal
loads
Changes based on
climate, sensible only
Temporary adjustment
being allowed for cooling
demand by PHIUS
Air Tightness 0.6 ACH50 required / 0.033
cfm/ft2 of façade
recommended for large
buildings
0.08 cfm/ft2 of façade for
6+ stories & non-
combustible, 0.05 cfm/ft2
for all others
Ventilation Not a lot of approved ERVs in
US
Approve a lot more ERVs
Cooling & Heating
Loads
Can certify based on
demand or load
Must meet both demand
and load thresholds
Can be difficult to meet
both
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Air Tightness
• Requirement: < 0.6 ACH@50
• What does this mean?
– @50 refers to 50 pascals pressure difference between indoors and out during a blower door test, ≈ 20mph wind on all sides of house
– 0.6 ACH50 = 5 times tighter than ENERGY STAR®
• Method A and Method B Testing
– A: Configures building to operation during the heating and cooling seasons
– B: Any intentional openings in the
building envelope are sealed
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Blower Door Testing
• Basic Components– Gauge
(manometer)
– Shroud
– Frame
– Fan
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DESIGN PHASE
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PH Design Phase Process
Schematic Design: 1-2 months
• Feasibility Analysis & Recommendations – several iterations
100 % DD: 3-6 months
• Pre-Construction Energy Calculations – 1st detailed model
50% CD: 2-3 months
• Update Model & Start THERM Modeling
• Air Barrier Review, QA/QC Checklists & Blower Door Test Plan
100% CD:
• Pre-Construction Energy Calculations & THERM Modeling
• Update Air Barrier Review, QA/QC Checklists & Blower Door
Test Plan
• Pre-Certification Submittal to Certifying Body
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PH Design Phase
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Continuous Insulation & Air Barrier
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Continuous Insulation & Air Barrier
1. Roof slab
2. Interior Gyp on
Exterior Walls
3. Foundation
Slab
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Air Barrier Details
• Air barrier continuity
– High attention to the
details
• Insulation continuity
– Thermal bridge
mitigation
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QA/QC Checklists
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CONSTRUCTION PHASE QA/QC
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PH Contractor Buy-In
• General contractor and subcontractor buy-in is critical to project success
• All trades have an impact on project results and may require a mind shift on performance testing
• Passive House Tradesperson training mandatory for key personnel
• GC needs at least two people who will be dedicated to PH scope and coordination
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PH Contractor Buy-In
• Ensure GC and trades fully understand
what’s included in respective work
scopes
• Discuss expectations with whole
project team during bidding phase
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Verification for Large Projects
• Foundations– Abutting neighbor(s)
– Staging of foundation
– Under slab / stem walls
• Above Grade Walls– Wall construction type: CMU,
wood framed, etc.
– Sequencing for hoistways, upper vs. lower floors
• Roof– Thermal breaks and roof
membrane penetrations
– Bulkheads, louvers & dampers
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Testing Tools and Protocols
• Window mockup testing
• Guarded blower door testing
• Envelope compartmentalization
and window testing
• Unique component testing
• Whole building blower door test
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CASE STUDIES
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CORNELL TECH CAMPUSTallest Passive House Project in the World
352 units
Roosevelt Island, NY
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Redline Plan & Section
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Drill Into Details
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Identify Sequencing & Timing
of Inspections
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Develop Contractor Checklists
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Wall Panels
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Automated
Inspection Checklists
• Large projects w/
multiple dwellings
• Repetitive tasks –
duct & unit by unit
leakage testing
• Insulation inspections
SWA Checklists
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Site Visit Reports
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Issues Log
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Interim Testing
• Original plan – no whole floor testing
• Revised plan – guarded testing on 4th,
5th and 6th floors
• Window & Door Leakage
• Façade Leakage
• Compartmentalization
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Guarded Testing
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Temporary Air Barrier
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Blower Doors on 3 Floors
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Other Tests
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• Condenser porch doors
• Trash chute rooms / doors
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Progress
• Blower door test completed – 6/3/2017
• 0.13 ACH50 (more than 4x less than 0.6)
• ERVs commissioning completed
• Students moved in August 1, 2017
• PH Certification received on
October 17, 2017!!!
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ST. JOHN NEUMANN PLACE SENIOR HOUSING - 52 DWELLINGS
PHILADELPHIA, PA
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Redline Plan & Section
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Drill Into Details
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Verify On Site
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Site Visit Reports
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Interim Testing
• Insulation
• Original plan – whole building testing
• Revised plan – window/unitized testing
• Window Leakage
• Façade Leakage
• Heat / cool duct testing
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Façade Leakage
Measurements: Qualitative
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Progress
• Blower door test did not passed – no interim whole building blower door or guarded test performed
• Two follow up visits to try and reduce infiltration - $$$
• ERVs balancing a challenge at low flows
• MEP installed exhaust only systems in some locations
• Did not receive certification
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BEACH GREEN NORTHAffordable Housing – 101 units
QUEENS, NY
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Wall Inspections
• ICF doesn’t require as many inspections for insulation and air barrier
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1st Window Mockup
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2nd Window Mockup
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Window Testing w/ Blower Door
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1st Window Mockup –
Different ICF Project
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Further Window Mockups –
Different ICF Project
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Progress at Beach Green
• AeroBarrier by Aeroseal was utilized
• Envelope leakage test performed 6/24/2017 – couldn’t finish, Building Department shut down site for working on Saturday
• Infiltration test for model scheduled for 7/6/2017 – passed!!
• ERV testing & commissioning completed
• Documentation submitted to certifier and is in review
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LOGISTICS
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Whole Building Test Logistics
• Enough fans, cruise manometers, frames, shrouds, tubing, CAT5 cabling?
• Is building access limited to avoid people opening and closing doors, windows, etc.?
• Thorough walkthrough the day prior to test date to confirm prep has taken place?
• GC and appropriate subs on site to help with building prep and issues that come up on the test day?
• Saturday work permits pulled?
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Blower Door Test Plan
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Blower Door Test Conditions
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• Need to seal off
ERVs for final test
• Can’t seal off
vents from outside
for individual ERVs
• Tape off both
outdoor
connection ports
inside every ERV
• Wrap rooftop ERVs
ERVs & Blower Door
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Whole Building Test Logistics
• A great resource is Blower Door Applications Guide:
Beyond Single Family Residential PDF (Brennan,
Clarkin, Nelson, Olson, Morin)
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STAR GARMENTSClothing Manufacturing Plant: Retrofit
Sri Lanka
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Logistics
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RECOMMENDATIONS FOR
SUCCESS
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Do This
• Mockups
• Guarded testing
• Panelized construction if budget allows
• Insist on training for construction staff
• Make typical details readily available
on site for all subs
• Use schedules in the plans to call out
air barrier materials
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Do NOT Do This
• Assume if the CM has done a PH project that the 2nd will automatically pass
• Keep going without passing the window mockup
• Depend on subs reading the specifications
• Allow the CM to exclude meeting PH requirements from the contract
• Ignore your PH Consultant!!!!!
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THANK YOU!
CALL US 866.676.1972 | SWINTER.COMNEW YORK, NY | WASHINGTON, DC | NORWALK, CT 67
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ThankYou!