a peak behind the curtain - building science …...outline stick/unitized systems material...
TRANSCRIPT
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A PEAK BEHIND THE CURTAIN …
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OUTLINE
Stick/Unitized SystemsMaterial Compatibility & Adhesion IssuesFabrication & Installation IssuesShadow BoxingGlass IssuesForeign ProcurementIndustry Trends
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Stick Systems
Anchors, Vertical Mullions, Rails, Backpans/Spandrels, IGUs
Source: Alumicor
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Sleeve or spigot
Bond-Breaker Tape and seal at Expansion Joint
Source: CMHC Best Practice Guide
Note air/water seal location between mullions and rails
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Source: CMHC Best Practice Guide
Source: Reynaers
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Source: CMHC Best Practice Guide
Air Flow and Rainwater Control
Source: Reynaers
Pe
Pi
Pe
Pe
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UnitizedSystems
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Unitized Systems (Captured)
Source: Alumicor
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Structural Silicone Systems (SSG, 2 & 4 sided)
Courtesy: The Dow Chemical Co. Weather Seal, IGUs, Structural Silicone, Silicone Compatible Tape or Gasket
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Unitized Systems (SSG)
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Source: Aluminco
Source: Kawneer
Toggle/Cassette Systems
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Material Compatibility & Adhesion Issues
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Field De-glazing
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Trial & Error
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Don’t Forget To Ask For….
Sealant Manufacturer Prequalification Testing Including:
Adhesion Testing
Compatibility Testing
Non-Staining Testing
TAKES 4 TO 6 WEEKS!
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Lab Testing
Adhesion Compatibility
Courtesy of The Dow Chemical Co.
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Silicone and EPDM Incompatibility
Courtesy of The Dow Chemical Co.
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Structural Silicone QC - Plant
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Courtesy: CSA A440.6 (Sneak Preview)
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LESS
ON
S Ensure Pre-Qualification Testing has been Completed by Sealant Manufacturer
Review In-Plant QC testing
Perform Cut-Tests or Full De-Glaze for Field-Applied SSG
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Fabrication Issues
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LESS
ON
SUnderstand Material Limitations
Validate Integrity of Installation with Field Testing Early in the Process
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Poor Exterior Rainwater Shedding
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Poor Exterior Rainwater Shedding
Poor Exterior Rainwater Shedding
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Obstructed drainage
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Obstructed drainage
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Discontinuous or Deteriorated Concealed Seals
Discontinuous Inner Seals
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LESS
ON
SProvide Effective Water-Shedding Details
Provide Unobstructed Drainage Paths
Provide Continuous Inner Air/Water Seals
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Installation Issues – Field Applied SSG
Installation Issues –Field Applied SSG
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The preferred method
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Field mock-ups
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Installation Issues – IGU Support
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Source: Technoform
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LESS
ON
SHigher degree of field oversight and testing required with field applied SSG
Understand component support strategies
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career path
Shadow Boxing
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Shadow Box Assembly
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career path
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It’s a Different Story in a Cold Climate…
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career path
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career path
So where’s the moisture coming from?
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‘Pseudo’ Shadow Box
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LESS
ON
S Shadow Box Assemblies are Risky in Cold Climates
Consider ‘Pseudo’ Shadow Box Approach Option
Use a Lighter More Reflective Metal Liner or Apply Pattern to Glass
Manage Mechanical Systems Appropriately
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Glass issues -Scratches
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Comets and V’s
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S SN NNNN N
Removed for surface 2 lab test
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• Low-e consistently on Surface #3 and same product• Same PVB interlayer • All outer tinted grey lites from same batch• No correlation between tin side and air side of glass
Glass Issues - Colour
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Spectrophotometer - ASTM C1736 / ASTM D2244, Delta E < 4.5Delta E measured at 2.6 (inconsistency in low-e coating)
-b
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#4 #7#5 #7
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career path
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Distortion
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Horizontal Roller Wave Distortion Vertical Roller Wave Distortion
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LESS
ON
S Be Careful with Cleaning Heat Treated Glass
Specify Colour and Roller Wave Tolerances
Full Size Mock-Ups
Exercise Care with Novel Coating Combinations
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Hands Off!!
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LESS
ON
S“You get what you inspect, not what you expect”
- Bryan Hubbs
If you’re buying foreign product, Live in the Plant!
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Source: GlassCan
Industry Trends
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Source: GlassCan
Source: GlasCurtain Inc.
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H I G H E R P E R F O R M A N C E ?
R2-3 R3-4 R19 to ??
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cold formed steel frame and/or aluminum extrusion
sheathing
AVB material
mineral wool insulation
air space
punched windows within a variety of cladding types
install and connect like curtain wall
size limited to transport
Courtesy of Island Exterior Fabricators
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quality of fabrication
schedule
gasketed system eliminates exterior work/maintenance
higher thermal performance
single source
less waste
less labour
safety
lacking mature supply chain
cost
some limitations in building geometry
hybrid wall system
commitment at design concept stage