John Straube 2005 121 University of Waterloo, School of Architecture EIFS Rain Control Both Drained and Perfect Barrier can be used Joints and Element can be designed differently 122 University of Waterloo, School of Architecture • The problem wall of the past • Relies on sealant = dangerous • Often used moisture sensitive OSB and exterior gypsum Face Sealed Perfect Barrier John Straube 2005 123 University of Waterloo, School of Architecture Beware of EIFS: They must be done correctly They leak at joints Avoid moist sensitive substrate John Straube 2005 124 University of Waterloo, School of Architecture EIFS
Transcript
John Straube 2005
121
University of Waterloo, School of Architecture
EIFS Rain Control
Both Drained and Perfect Barrier can be usedJoints and Element can be designed differently
John Straube 2005
122
University of Waterloo, School of Architecture
• The problem wall of the past• Relies on sealant = dangerous • Often used moisture sensitive OSB and exterior gypsum
Face Sealed Perfect Barrier
John Straube 2005
123
University of Waterloo, School of Architecture
Beware of EIFS:They must be done correctlyThey leak at jointsAvoid moist sensitive substrate
John Straube 2005
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University of Waterloo, School of Architecture
EIFS
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University of Waterloo, School of Architecture
Substrate + moisture = problem
Moisture sensitive substrates are a problem
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University of Waterloo, School of Architecture
water resistantmembrane
drainopening
reinforcedlamina
Finish coat
insulation
substrate
two-stagedrainedjoint
drainage space ordraining materialDrained EIFS
Feels good, but ….Additional complexityMay trap water in wallMay require fasteners
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University of Waterloo, School of Architecture
insulation
drain opening
reinforced lamina
finish coat
substrate
two-stagedrained joint
EIFS Face Sealed - Drained Joint
• Sometimes called “Source Drained”•Implies source is known• Substrate may be exposed to incidental moisture• Slow drying
Wood frame hotel in GTAFace-sealed jointsOver TyvekDrained?
Meet Code?Meet OAA?
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Joints / FlashingEavestrough
Drainage Space
Sloped Flashing
5% min
Sub Sill Flashing
Sloped Grade
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Types of Flashing
Base flashingCounter flashingStep flashingValley flashingCap FlashingWall Flashing – drainage plane to exit
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Physical Principles
Water runs downhill (!)Flashing is the perfect barrier in drained wallsNothing is installed flat or butted tightEverything movesExposed caulking eventually failsIf it doesn’t get wet, it wont leak (exposure!)
project out from wall– Recommend 1” if you wish to drip free of wall
control “run back” by grooves and edges
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University of Waterloo, School of Architecture
•Generous projection •Clear drip groove•Large side extensions
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University of Waterloo, School of Architecture John Straube 2005
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University of Waterloo, School of Architecture
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University of Waterloo, School of Architecture
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Its easy to slope parapet caps
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Water can build up here -- we need a waterproof barrier
Note water standing
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End-Dams & Backstops
all low-slope flashings need end dams, e.g.– window-sills– masonry-veneer
Backstop at rear typically minimum of 4”Typically specify 6” for high exposureCorners must be made watertight -vulnerable
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Joints protected •slope•end dams
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University of Waterloo, School of Architecture
Low Roof to Wall
Common source of problems
www.apawood.org
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Diverter FlashingNotes:
1] Coordinate installation ofGold Guard system andEIFS with the roofinstallation.Typically, the step anddiverter flashings areinstalled as part of theroof assembly.
2] Refer to Sto detail 10.62afor integration of GoldGuard system with thestep and diverterflashings.
3] Install the starter track2“ (50mm) above thefinished roof and buttingagainst the diverterflashing so waterdraining down the startertrack will not flow overinto the wall.
4] Install Sto Gold Fill™over the upper edge ofthe starter track andcoat with Sto GoldCoat™.
Substrate
Sto adhesive
Sto insulation
Sto base coat
Sto finish
Sto Gold Coat
Sto Gold Fill with StoDetail Mesh
Starter track with weepsinstalled over stepflashing and Sto GoldFill (see Sto detail10.62a)
