air barriers for masonry walls - Masonry Contractors Association of

Transcription

Air Barriers For Masonry Walls
MCACP/IMI/BAC Seminar
February 25, 20089
1
air barriers for
masonry walls
pat conway, aia, csi
international masonry institute
[email protected]
© international masonry institute 2009
international maso nry institute
!
!
labor/management
non-profit
funded by
!
international union
of bricklayers and
allied craftworkers &
contractors who
employ them
brice house, annapolis
INTERNATIONAL MASONRY INSTITUTE
800-IMI-0988, imiweb.org
February 25, 20089
2
IMI national training center
IMI national training center
February 25, 20089
3
craftworker training
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1)4&.'*.$)/%/%,
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0"%.$)0."$*0"33&,&
professional education
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February 25, 20089
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free IMI services
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drawing review
specification review
customized seminars
job site troubleshooting
cost information
hands-on education
workforce supply
conceptual structural
engineering support
imiweb.org
details, Q&A, blog, events
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800.464.0988
life-cycle cost analysis
LEED support
February 25, 20089
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imi tool kit
February 25, 20089
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air barriers for
masonry walls
[email protected]
aia policy
International Masonry Institute is a Registered Provider with The
American Institute of Architect’s 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
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. Questions related to
specific materials, methods, and services will be addressed at the
conclusion of this presentation.
February 25, 20089
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copyright materials
this presentation is protected by U.S. and
international copyright laws
reproduction, distribution, display and use of the
presentation without written permission of the
speaker is prohibited
learning objectives
1. understand basic function of air
barriers
2. acquire knowledge of air barrier
products and installation techniques
3. learn how to design air barrier systems
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seminar outline
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air barrier basics
the perfect wall
codes & standards
case studies
air barrier basics
February 25, 20089
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moisture sources
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air ex-filtration
source: ASTM STP 1432, Masonry: Opportunities for the 21st Century
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top of wall air leakage
90% - 1% waterproofing principle
“as much as 90%
of all water intrusion
problems
occur within 1%
of the building
envelope surface
area”
Source: Construction Waterproofing Handbook, McGraw-Hill, 1999
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90% - 1% waterproofing principle
“as much as 90%
of all water intrusion
problems …
occur within 1%
of the building
envelope surface
area”
Source: Construction Waterproofing Handbook, McGraw-Hill, 1999
plug the holes !
February 25, 20089
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air leakage quiz
1.
2.
3.
4.
5.
6.
control joint
lintel
conduit hole
brick ties
stone ties
door frame & wall
interface
7. typical s.f.
mason contractor training
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vapor drive
ventilated wall
source: Builder’s Guide to Cold Climates, 2004, Joseph Lstiburek, Building Science Corporation,
www.buildingscience.com
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weep vents
ventilated cavity wall
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what’s wrong ?
vapor drive !
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air barrier terminology
air barrier = air retarder
“air barrier”
&
“vapor barrier”
ARE NOT SYNONYMS
February 25, 20089
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“air barrier”
&
“vapor barrier”
ARE NOT SYNONYMS
“air barrier”
&
“vapor barrier”
are not synonyms
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air barrier definition
“a material or
combination of materials
collectively having
maximum air leakage
rates of 0.06 cfm/ft2 at
0.30 in. h2O when tested
in accordance with ASTM
E783, installed to resist
air leakage into the
exterior envelope”
vapor barrier definition
“a material having a
permeance rating of 1.0
perm or less, when tested
in accordance with ASTM
E96, such as foil, plastic
sheeting, or insulation
facing, installed to resist
the transmission of water
vapor through the
exterior envelope”
international building code (IBC) definition
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water-resistive barrier definition
“a minimum of one layer of
No. 15 asphalt felt, complying
with ASTM D226 for Type 1
felt, shall be attached to the
sheathing, with flashing as
described in Section 1405.3,
in such a manner as to
provide a continuous waterresistive barrier behind the
exterior wall veneer”
International Building Code (IBC) Definition
moisture management systems
diffusion
vapor barrier
water-resistive barrier
air barrier
bulk water
air leakage
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air barrier purpose
“the primary purpose
of an air barrier system
is to stop air from
leaking into and out of
the building enclosure”
air barrier association of america
airbarrier.org
systems thinking
“no single component
or material has the
capability to provide a
complete air barrier
system for a building”
air barrier association of america
February 25, 20089
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Sample AB specification – section 07262
9:9;<=*><9?@AB;ACD
EF
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(&(7$)%&1I*)%-*4"#%-)./"%*).*4""./%,*3/%&F**A%1.)33)./"%*12)33*$&J#/$&*
0""$-/%)./"% 6/.2*1&J#&%0&*"4*6"$8*).*)33*6/%-"61*)%-*-""$*"+&%/%,1G*
3"#5&$1*)%-*1/(/3)$*+&%&.$)./"%1*"4*7)$$/&$*."*/%1#$&*0"%./%#/.' "4*
7)$$/&$F
why install an air barrier ?
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protects building
envelope from moisture
related problems
it’s the law…in some
1
states
2
saves energy
K*L 02&08*3"0)3*7#/3-/%,*M*&%&$,'*0"-&1
N*L +&$*DA9;*H%)./"%)3*/%1./.#.&*"4*1.)%-)$-1*)%-*.&02%"3",'I*1.#-'G*NOOP
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U.S. department of energy
“up to 40% of
energy consumed to
heat or cool a building
is due to air leakage
into and out of
buildings.”
United States Department of Energy (DOE)
air barriers & energy savings
NIST 2005 study:
! building envelope airtightness
! 30-40% savings in energy for heating
! 10-15% savings in energy for cooling
!
one of top 5 greening “no brainers”
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2005 NIST study results
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wisconsin department of commerce
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air leakage is usually much
more destructive to the
integrity of the exterior
wall system than is vapor
transmission, in fact, air
leakage into/through
exterior walls in northern
climates is the leading
cause of wall problems” 1
State of Wisconsin, Department of Commerce, Minimum Requirements and
Guidelines for the Exterior Building Envelope - 2001
air leakage ramifications
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higher HVAC costs
increased greenhouse gas
emissions
reduced occupant comfort
risk of mold development
premature building
envelope deterioration
higher life-cycle cost
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high internal moisture projects
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hospitals
nursing homes
museums
libraries
wet labs
swimming pools
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greenhouses
food processing
showers & baths
computer centers
printing/copying
occupancies
air barrier attributes
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secure
continuous
strong
durable
heat stable
impermeable ?
bridging capability
worker friendly
environmentally friendly
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sustainability issues
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non-toxic run-off
benign over-spray
low v.o.c.
minimal
manufacturing
waster
green spec (EBN)
the perfect wall
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wall without an air barrier
?
?
Source: Joseph W. Lstiburek Ph.D, P.Eng., FASHRAE. Building Sciences, Inc. 2007
February 25, 20089
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the perfect wall
cladding
thermal control
water, air, vapor
control
building structure
Joseph W. Lstiburek Ph.D, P.Eng., FASHRAE. Building Sciences, Inc. 2007
February 25, 20089
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the perfect wall
masonry cavity wall
February 25, 20089
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masonry veneer wall
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codes & standards
air barrier state codes
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massachusetts (2001)
wisconsin (2002) 1
michigan (2006)
georgia (2007)
minnesota (2008)
20 potential states
ASHRAE 90.1 addendum z
(2008 - draft)
1 – wisconsin repealed air barrier language from building code in 2008
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ASHRAE standard 90.1-2007, addendum z
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will be mandatory on
federal buildings
establishes
requirements for
opaque envelope
defines “continuous”
sets testing standards
air barrier i-codes
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2006 IBC – chapter 14, section 1403
2006 IECC – chapter 4
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case studies
moisture transfer study
" moisture via air diffusion
# no openings = 0.00158 gal.
!
#
moisture via air leakage
1 in2 net opening = 3.7 gal.
" 2,333 times more moisture
via air leakage!
1 - Institute for Research in Construction, National Research Council, Canada 1m2, 70oF, 30%
RH, 9.3 MPH wind, -4oF sheathing, 4 mil VR, 1 month
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continuous air barrier
air leakage testing
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durability testing
cmu test specimen
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air leakage testing - cmu
masonry wall air leakage
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masonry wall air leakage
air barrier adhesion testing
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Improperly applied elastomeric
when to install an air barrier
“…shall be provided
when a building
component or
assembly separates
interior building
conditioned space
from the outdoors” 1
1 - wisconsin enrolled commercial building code - 2002
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air barrier location
“interior side
of wall
insulation” 1
1 - Wisconsin Enrolled Commercial Building Code - 2002
proper air barrier location
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air barrier @ masonry rain screen wall
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air barrier @ channel-anchored masonry
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air barrier @ channel-anchored masonry
problem with “poly” air barriers
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discontinuous poly “air barrier”
hospital
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hospital
hospital
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air barriers solution for veneer walls
weep vent
insultation
back-up wall
(uninsulated or
foamed – no batts!)
air barrier
what’s wrong ?
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what’s wrong ?
what’s wrong ?
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what’s wrong ?
what’s wrong ?
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swimming pool
swimming pool
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swimming pool
university laboratory
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university laboratory
car wash
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car wash
car wash
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rolled-on bituminous air barrier
brush-applied elastomeric air barrier
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adhesive membrane – improper installation
adhesive air barrier membrane
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membrane air barrier
veneer replacement case study
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air space compartmentalization
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c
spray-applied urethane foam air barrier
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typical foam use
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air barrier mock-ups
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dripping bituminous AB @ 55oF
overture center air barrier
February 25, 20089
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air barrier as water-resistive barrier
substrate prep
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substrate prep
spray-applied elastomeric
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spray-applied elastomeric air barrier
quality control
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complete air barrier system
air barrier & flashing interface
February 25, 20089
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air barrier & flashing interface
air barrier & insulation interface
February 25, 20089
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Rigid Insulation
tape as an air barrier ?
Building Structure
Rigid Insulation
Tape
Cladding
Building Structure
Rigid Insulation
Cladding
Rigid Insulation
better location for the air barrier
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rigid insulation joints
continuous rigid insulation ?
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air barrier & window interface
air barrier window detail
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air barrier & top-of-wall interface
air barrier parapet detail
February 25, 20089
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air barrier & top-of-wall interface
harley-davidson museum
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conclusion
key take-away points
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air barrier goals
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protects building envelope
saves energy
code compliance
typical vapor barrier is not an air
barrier
specify air barriers as a system
require certified installers
February 25, 20089
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thank you for
your time
questions
this concludes the american institute of architects
continuing education system program
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air barriers for
masonry walls
[email protected]

air barriers for masonry walls - Masonry Contractors Association of

Transcription

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