kate johnson – the dow chemical company dan tempas – the ... · kate johnson – the dow...
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Kate Johnson – The Dow Chemical Company Dan Tempas – The Dow Chemical Company Craig Buck – The Dow Chemical Company
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Air Barriers Test Design Flashing Tape Joint Seal Foam Sealant Joint Seal Test Results Installation Practicality Conclusions
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Effects of air infiltration on energy consumption:
School buildings 29% Houses 40% Tall buildings (commercial) 22-46% High-rise residential 40%
*National Research Council of Canada report
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Energy Loss = Money Loss
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Slow Energy Loss
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Air Infiltration
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Air Barrier
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Air Barrier
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Two Steps: • Time Consuming • Expensive
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XPS Insulation
Joint Sealant
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Joint Sealant
• Not New Concept
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Joint Sealant
• Not New Concept
Expensive!
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Foam Sealant • Fast • Easy • Inexpensive
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Small scale Board-to-board Board-to-block
Full Scale Assembly
Real scale Field Installation
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Board-to-Board
Board failed before foam sealant (Cohesive Failure)
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Board-to-Block
Board failed before foam sealant (cohesive failure)
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Test Method: ASTM E2357: “Standard Test Method for Determining air Leakage of Air Barrier Assemblies”
Air barrier assembly test comprised of the following: Air leakage baseline Wind pressure conditioning
Sustained at 600 Pa 1 hour (+/- pressure) Cyclic , 2000 cycles (+/- pressure) with deformation Gust wind of 1200 Pa (+/-) with deformation
Air leakage post-conditioning Structural wind load of 1440 Pa (+/- pressure) with
deflection
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Whhh hh hhhhh
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Thin Thick
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Thin Thick
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Steel stud (18 gauge) Gypsum exterior sheathing (1/2”) Extruded polystyrene insulation in 16” width
16” oc horizontal 8 “ oc vertical
Butt edge Pos-I-Tie self-tapping brick ties (2” barrel)
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Tape Foam sealant
Penetrated wall
Opaque wall
ASTM E2357 Test Matrix
Wall #1a
Wall #1b
Wall #2a
Wall #2b
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0
0.05
0.1
0.15
0.2
0.25
Negative Positive Negative Positive
0.0055 0.0068 0.0087 0.0051
Opaque Wall Penetrated Wall
Baseline Air Leakage Rate (L/sm2)
Post-Conditioned Air Leakage Rate(L/sm2)
L/sm
2 at 7
5 Pa
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0
0.05
0.1
0.15
0.2
0.25
Negative Positive Negative Positive
0.0808 0.0688 0.0032 0.0087
Opaque Wall Penetrated Wall
Baseline Air Leakage Rate(L/sm2)
Post Conditioning Air LeakageRate (L/sm2)
L/sm
2 at
75
Pa
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Flashing tape and foam sealant PASS ASTM E2357 as joint materials
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Taped joints more difficult to install in brick/block walls in field practicality
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THANK YOU!!!!!