air barrier workshop 9-9:45 whole building testing this...
TRANSCRIPT
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• Air Barrier Workshop
• 9-9:45 Whole Building Testing
• This presentation will provide some experience gained from the whole building testing of dozens of diverse large buildings, and summarize the results of hundreds of tests from specific geographic areas. Specific examples of challenges met, and future obstacles to be overcome, will discussed. The airtightness data will be examined for trends and recommendations for future practise and research made.
• The audience is very knowledgeable but somewhat lacking in a full understanding of whole building testing. The goal is for the attendees to fully understand that the industry can test whole building right now.
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Airtightness testing
Dr John Straube, P.Eng.
Associate Professor, University of Waterloo
Principal, RDH Building Science
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History of Airtightness
• Implicit for thousands of years
• Explicitly provide• Building paper
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Testing in the 70’s
• Large Buildings, special fans
• Standard blower door for housing
• Measure for interest/research
• Weatherization
1977: 1 ACH@50Pa
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•NRCC/DBR 1982:
40 homes Built 1977-1980 (Canadian Prairies)
Avg 1.42 ACH@50 Pa
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2000’s
• Testing large buildings became normal for researchers
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Current State
• Following the leadership of GSA and US ACE, whole building airtightness is entering the mainstream
• Other owners with long-term stake in building are specifying it
• State & City codes are beginning to require it
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Why whole building airtightness testing?
• 1. Demonstrate compliance• Most reliable and accurate means of
showing codes/standards/specs are met
• 2. Quality Control• Measurement of complete product (building)
to confirm airtightness
• 3. Diagnostic• Aid to identify where leaks are and if repairs
are effective
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Why airtightness?
• Comfort
• Health
• Moisture
• Energy
• Code
• Standards (e.g. ASHRAE, PassivHaus)
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Definitions (ABAA)• Air Barrier System: The combination of air barrier assemblies and air
barrier components, connected by air barrier accessories that are designed to provide a continuous barrier to the movement of air through an environmental separator (e.g. the building enclosure).
• Air Barrier Assembly: The combination of air barrier materials and air barrier accessories that are designated and designed within the environmental separator to act as a continuous barrier to the movement of air through the environmental separator.
• Air Barrier Component: Pre-manufactured elements such as windows, doors, and service elements that are installed in the building enclosure that form part of the air barrier system.
• Air Barrier Material: A building material that is designed and constructed to provide the primary resistance to airflow through an air barrier assembly.
• Air Barrier Accessory: Any construction material that is used to join air barrier materials, air barrier assemblies, and air barrier components
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Targets, e.g. GSA
• Common (e.g., GSAMaterial: 0.02 lps/m2 @75 Pa=
Component: 0.2 lps/m2 @75 Pa=
Building: 2.0 lps/m2 @75 Pa=
• USACE 1.25 lps/m2 @75 Pa (0.25 cfm)
• DOE “Future” 0.25 lps/m2 @75 Pa (0.05 cfm)
0.004 cfm / ft2 @0.3”wg
0.04 cfm / ft2 @0.3”wg
0.4 cfm / ft2 @0.3” wg
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Targets?
•
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Different targets
• Building leakage requirement most important for
• energy,
• interior RH,
• some IAQ
• Component leakage requirement maymatter more for
• air leakage condensation control,
• Comfort, IAQ
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Do materials matter?
• Building target 0.4 cfm/[email protected] in w.g.
• Assume material “fails” requirement• E.g. 2x max = 0.008 cfm/[email protected]” w.g.• “Failure” causes 1% increase in flow
• Even for “tight” homes• 0.6 ACH target• “Failed” material adds about 0.75%• Equals about 0.01 ACH
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Pressures During Test
• Wind & Stack
• If too large, can’t test
Air
leaks
out
+
NPP
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When can one test?
•
0%
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1-10storeys
11-20storeys
21-30storeys
31+storeys
10 m 20 m 30 m 40 m 50 m
CGSB 149.15-96 ASTM E 779-10
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Portion of Year With Appropriate Environmental Conditions for Testing(Exluding 10pm to 6am)
Vancouver Toronto Calgary Edmonton Montreal Winnipeg St. John's Yellowknife Whitehorse
0%
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50%
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80%
90%
100%
1-10storeys
11-20storeys
21-30storeys
31+storeys
10 m 20 m 30 m 40 m 50 m
CGSB 149.15-96 ASTM E 779-10
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f Y
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Portion of Year With Appropriate Environmental Conditions for Testing(Exluding 10pm to 6am)
Vancouver Toronto Calgary Edmonton Montreal Winnipeg St. John's Yellowknife Whitehorse
Tall buildings wont be
“testable” if it is windy and/or
cold
Often we find “windows” of
opportunity
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Reporting Metrics
• ACH @ pressure (usually @50 Pa = 0.2”)• Volumetric flow rate / volume
• Permeance (usually @50 or 75 Pa)• Volumetric flow rate / area
• What area?
all six sides of enclosure
• Higher pressures are both possible and preferable for measurement accuracy
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Measurement Reporting
• Common to use ACH@50 for houses• This is not a good metric for enclosures
• Industry has chosen cfm/sf @ 75 Pa for commercial buildings
• Accounts for enclosure : floor ratio• Which test? Pressurization or
Depressurization? Average
• Use of total enclosure area is common• Check that the area used includes slab• Where is conditioned/unconditioned space?
Building Science19
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Why ACH is a poor metric
• e.g. a 2 story house vs hi-rise apt. @0.6ACH50
• House 0.038 cfm50/sfvs
• Apartment 0.097 cfm50/sf
• Large buildings can easily meetlow ACH targets
• But relation to performance?
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Measuring Airtightness
• Usually use ASTM E779 /E1827 (in North America)
• May use building airhandler if flow can be measured accurately (e.g. CGSB)
• Buildings over 800 000 sf and 30 stories have been tested to date
• USACE has best protocol IMHO, supported by best ASHRAE research
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How to measure?
• Pressurize/depressurize• Unlike in houses, both are recommended
• Seal / damper intentional holes• Beware operational reality vs test
• Limit testing when pressures imposed• Stack effect
• Wind
• Important issues for large buildings
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23
Blower doors…• Imposes Uniform Air pressures
• Real life is not uniform
Test results therefore…• Cannot directly or accurately
predict in-service air leakage
• HVAC pressurization can begin
to approach leakage of test
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Airtightness testing willnot tell you exactly how
much a building will leak in operation
Need more info… where is leakage, what pressure building operates at (HVAC is a big factor)
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Test vs Service pressure
•
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Air Leakage Testing
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Excellent Reference.
28
http://www.wbdg.org/pdfs/usace_airleakagetestprotocol.pdf
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Practical Issues: A Big Deal
• Occupancy– doors opening, bathroom fans operating, HVAC operation?
• Security/Safety- opening doors to connect interior spaces together
• Control & Power. How to control many different blowers How to power same.
• Sealing. Need to access and seal many HVAC vents grilles, etc.
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Large Building Air Leakage Testing
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Building Science.com– Air Flow, Pressures and IAQ
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Sealing Openings
•
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Building Science.com33
• Power Supply: 15A-20A per door
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Whole-Building Testing
• Test early if you must hit a target
• Design enclosure for testability• Construction sequencing!
• Test before most of air barrier system is covered by other layers
• Do mockups
• Confirm trades are executing early
Building Science34
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Air Leakage Testing
Photos: Building Science Corporation,
Kohta Ueno
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HVAC Systems
• Grills, louvers, dampers, vents are all penetrations of the air barrier system
• Become one of the largest sources of leakage in “good” buildings
• Typically these are excluded from targets, but should be measured if you can
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Compartmentalization
+50 Pa
+50 Pa +50 Pa
+50 Pa
+50 Pa +50 Pa
Exte
rio
r =
0 P
a
+50 Pa
+5
0 P
a
+50 Pa
Exte
rio
r =
0 P
a
+50 Pa
Test # 6 – Pressurize Suite and All Adjacent Interior Surfaces
Section View – Floor Above and Below Plan View – Test Floor
• Construction sequencing
• Managing size
• Research
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Many suites / many holes
• Significant effortrequired for multi-unitbuildings…..
• Depressure easier
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What to do with results?
• First, find the leaks
• Commonsense/experience is helpful
• ASTM E1186 Standard Practices for Air Leakage Site Detection in Building Envelopes and Air Barrier Systems
• IR camera, smoke, hand
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Verification TestingMockups: Confirm design can be built
and perform
In-situ testing: Verify that enclosure is
built as per design=mockup
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Smoke / visualization
• Especially useful diagnostically
• Demonstration to trades
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IR Camera
• Requires skilled operator
• Temperature difference
• Flow inward, then outward
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Air leak or thermal bridge?
Building Science44
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•Recent study for
the Canadian code
development
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Air Permeance
•
0
1
2
3
4
5
6
7
Air
tig
htn
ess
[L/s
.m²
@7
5 P
a]
Airtightness of All Buildings
Average = 2.19
Sample = 539 buildings
0.40
0.20
0.60
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Influence of requirements
•
0
1
2
3
4
5
6
7
8
9
10
Research USACE Washington
Air
tigh
tne
ss (
L/s*
m2
@ 7
5 P
a)
Summary of Airtightness of Buildings, Research vs Required
Maximum
Minimum
Median
Third Quartile
First Quartile
Maximum off Scale at 25
PerformanceRequirement
PerformanceRequirement
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Airtightness distribution
•
0
20
40
60
80
100
120
Nu
mb
er
of
Bu
ild
ing
s
Airtightness Range [L/s·m² @75 Pa]
Distribution of Building Airtightness
Mean = 2.15Median = 1.17Minimum = 0.20Maximum = 25.39Standard Deviation = 2.68Sample = 539 buildings
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Age
•
0123456789
1011121314151617181920
1875 1885 1895 1905 1915 1925 1935 1945 1955 1965 1975 1985 1995 2005 2015
Air
tig
htn
ess
[L/
s.m
² @
75
Pa
]
Construction of Building [year]
Airtightness Vs Year of Construction of All Buildings
Sample of 179 Buildings
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Airtightness vs Height
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Height of Buildings (Stories)
Airtightness Vs Height of All Buildings
Individual Buildings
Average
Sample of 420 Buildings
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Building “Construction”
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Airtightness of Buildings by Wall Type
Concrete Masonry Steel-Frame Wood-Frame
Mean = 2.86
Sample of 152 buildings
Mean = 4.58
Mean = 2.69
Mean = 5.38
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Is it worthwhile?
• Sample of 79 stakeholders
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Future
• Techniques to ensure economy and utility rather than scientific accuracy
• More complimentary techniques to extract full value
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Future: How tight? How leaky?
• Little research to support targets
• Field experience suggest commercial targets are getting good
• Housing/small buildings may need different targets
• Humidifed / special buildings need special targets.
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Conclusions
• Testing of large buildings is here, and practical / economical
• Lots of information of value can be extracted
• Key part of building quality assurance
• Improvements remain: very tall, wind, sealing HVAC
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What to do with results?
• First, find the leaks
• Commonsense/experience is helpful
• ASTM E1186 Standard Practices for Air Leakage Site Detection in Building Envelopes and Air Barrier Systems
• IR camera, smoke, hand
57
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Language
• Massive industry confusion• No clarity of communication =
no clarity of thought
• Is an air barrier a product? A Function?• E.g. Tyvek, Blueskin
• Vapor barrier
• What about WRB, Housewrap, damproofing, waterproofing, roofing, underlayment, etc.
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Combined functions
• Air barriers
• Air & water resistive barriers
• Air & vapor barriers
• Air, water, and vapor
• Air-water-thermal
• Air-water-vapor-thermal
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Roof Air Barrier?
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No deck Air Barrier
+ No fully-adhered membrane
+ White Roof
= accumulation of moisture & failure
Building Science– Roofs 62
From: Straube, J.F. High-Performance
Enclosures, Building Science Press 2012.
Problems
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Slabs, Radon, soil gas
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Poly Air-Vapor barrier
• Label of “vapor barrier” created lots of confusion
• Flexiblemembranehard to seal
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Poly and butyl sealant
• Original scientific approach 1970’s
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Targets
• R-2000 approx. 1984• Max 1.5 ACH@50 required
• Airtight Drywall Approach
• Poly continued to bepromoted
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Evolution of location
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Breakthrough: permeable air barrier
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How much leakage allowable
• Research suggested low air leakage rates to prevent moisture damage
• Assumed climate and assembly
Ojanen, 1996
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Flow Exponent
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0.2
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0.6
0.7
0.8
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1.0
Flo
w E
xp
on
en
t, n
Measured Flow Exponent (n) Value for All Buildings
Average = 0.62
Note that these points are below the theoretical minimum of 0.5.
Mean = 0.62Median = 0.60Minimum = 0.36Maximum = 2.09Standard Deviation = 0.14Sample = 157 buildings
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Enclosure – HVAC interaction
• Without estimate of airtightness:• How to size equipment?
• How to predict energy use?
• Pressurization / depressurization• Significant operational implications
• Old buildings were leaky and this did not matter ….
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Commercial HVAC