EFFECTIVE THERMAL PERFORMANCE OF THE BUILDING€¦ · • Energy cost budget path. ... COMPONENTS,...
Transcript of EFFECTIVE THERMAL PERFORMANCE OF THE BUILDING€¦ · • Energy cost budget path. ... COMPONENTS,...
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EFFECTIVE THERMAL PERFORMANCE OF THE BUILDING ENCLOSURE – EXTERIOR WALLS
CASCADIA – EDUCATIONAL PRESENTATION
2019 Update: It’s all in the cladding support
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WEBINAR ADMIN WEBINAR TECHNICAL SUPPORT -• Technical support is available for any issues during the webinar
CONTINUING EDUCATION CERTIFICATES -• Will be automatically emailed after the presentation• AIA & AIBC are automatically submitted (no need to self-report)• All other association learning credits can be claimed via self-reporting
QUESTIONS -• Feel free to post questions at any point during the presentation
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AGENDA: WHAT ARE WE LOOKING AT TODAY?
• INTRO TO CASCADIA WINDOWS & DOORS
• WHY ADDRESS THERMAL BRIDGING? HOW?
• WHY EXTERIOR INSULATION?
• PRESCRIPTIVE VS U-VALUES / PSI & CHI VALUES
• PRODUCTS – TESTING, DESIGN HISTORY, INSULATION ISSUES
• DESIGN TOOLS
• CHOOSING AN APPROACH
• WRAP UP
AGENDA
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INTRO TO CASCADIA WINDOWS & DOORS
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INTRO TO CASCADIA WINDOWS & DOORS
COMMERCIAL & MULTI-FAMILY PASSIVE HOUSE & RESIDENTIAL THERMAL SPACER FOR CLADDING SUPPORT SYSTEMS
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INTRO TO CASCADIA WINDOWS & DOORS
WINDOW WALLS WINDOWS & DOORS STOREFRONT GLAZING
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INTRO TO CASCADIA WINDOWS & DOORS
ABOUT THE COMPANY• Manufacturing plant & head office located in Langley, BC
• Founded in 2008
PRIMARY MARKETS• BC, Yukon, Washington, Oregon, California
COMPANY PURPOSE• To provide simple and cost-effective solutions to
stringent energy code requirements
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THE PROBLEM WITH BUILDINGSUnderstanding the impact of buildings on our energy grid and environment
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WHAT’S THE PROBLEM?
BUILDINGS ARE RESPONSIBLE FOR 44.5% OF US CO2 EMISSIONS.
DATA SOURCE: ARCHITECTURE 2030ILLUSTRATION: HAMMERANDHAND.COM
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THE IMPORTANCE OF BUILDING SCIENCE
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HEAT FLOW
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HEAT FLOW – CONDUCTION
CONDUCTANCE (U-VALUE)LAYER OR ASSEMBLY
CONDUCTION CONDUCTIVITY
HEAT FLOW THROUGH SOLID OBJECTS
RATE OF CONDUCTIVE HEAT FLOW DEPENDS
ON MATERIAL
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HEAT FLOW – CONDUCTION
CONDUCTION CONDUCTIVITY
HEAT FLOW THROUGH SOLID OBJECTS
RATE OF CONDUCTIVE HEAT FLOW DEPENDS
ON MATERIAL
Aluminum ~160 W/mKSteel ~60 W/mK
Stainless Steel ~14 W/mKFiberglass ~0.15 to 0.30 W/mK
Wood ~0.10 to 0.15 W/mKInsulation Materials 0.022 to 0.080 W/mK
CONDUCTANCE (U-VALUE)LAYER OR ASSEMBLY
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U-VALUE: CONDUCTANCE
HOW WELL HEAT MOVES THROUGH AN ASSEMBLY OR MATERIAL
THE LOWER THE U-VALUE, THE BETTER THE ASSEMBLY
1
𝑈= 𝑅
1
𝑅= 𝑈
HEAT FLOW – U-VALUE AND R-VALUE
R-VALUE: RESISTANCE
INVERSE OF U-VALUE
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PRESCRIPTIVE VS U-VALUETwo paths to the same end
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ENERGY CODES IN THE US & CANADA (2018)
INDIVIDUAL BUILDING CODES REQUIRE IMPROVED ENERGY PERFORMANCE BY REFERENCING VARIOUS ENERGY STANDARDS
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WHAT IS ASHRAE 90.1?
An energy standard with three ways to achieve compliance:
• Prescriptive path
• Building enclosure trade-off
• Energy cost budget path
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ASHRAE 90.1 – Climate Zone 5
Overall U-value (inverse of Effective R-value) Nominal R-values
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Overall U-value (inverse of Effective R-value) Nominal R-values
R-15.6 eff
MOST COMMON WALL TARGET
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WHY ADDRESS THERMAL BRIDGING?Understanding the impact of thermal bridging on a building’s overall thermal performance
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THERMAL BRIDGING
SHELF ANGLES SHELF ANGLES
STEEL STUDS
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KEY TERMS
NOMINAL R-VALUETHE R-VALUE OF JUST THE INSULATION ITSELF
EFFECTIVE R-VALUETHE OVERALL VALUE OF THE ASSEMBLY (WALL), INCLUDING ALL COMPONENTS, AIR FILMS, AND THE EFFECT OF ALL THERMAL BRIDGING.
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CONVENTIONAL INSULATED WALL ASSEMBLIES
Stud InsulatedR-5.5 ft²·°F·hr/Btu
Vertical Z-GirtsR-7.0 ft²·°F·hr/Btu Horizontal Z-Girts
R-7.8 ft²·°F·hr/Btu
Galvanized ClipsR-11.0 ft²·°F·hr/Btu
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CONTINUOUS Z-GIRT
NOT FEASIBLE TO MEET ASHRAE 90.1 MINIMUM PRESCRIPTIVE REQUIREMENT OF R-15.6 EFFECTIVE WITH CONTINUOUS GIRTS.
EFFECTIVE R-VALUES
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CROSSING Z-GIRTS
R-36 INSULATION WAS REQUIRED TO ACHIEVE R-15.6 EFFECTIVE
EFFECTIVE R-VALUES
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STEEL CLIPS
R-25 INSULATION WAS REQUIRED TO ACHIEVE R-15.6 EFFECTIVE
EFFECTIVE R-VALUES
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FIBERGLASS THERMAL SPACER
Fiberglass Thermal Spacer Wallwith 4” of Mineral Wool (R-4.2/in)
R-16eff
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HOW SUPPORTS IMPACT PERFORMANCEThermally-improved cladding supports more important than insulation type
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CLADDING ATTACHMENT MATTERS MOST
12” OF INSULATION
`
3.5” OF INSULATIONR-value eff
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METAL GIRT VS THERMAL SPACER
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WHY EXTERIOR INSULATION?Gives us a chance to place insulation away from thermal-bridging of stud layer
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INSULATION
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INSULATION – EXTERIOR VS. INTERIOR
INTERIOR INSULATION
• Thinner overall wall
• Cheapest if only using interior insulation**
EXTERIOR INSULATION
• Best thermal performance
• Best use of interior space
• Best location for vapour barrier
• Best condensation resistance
• Cheapest option to meet effective R-value requirements
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PSI & CHI VALUESA more meaningful and flexible modelling approach
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Graphic credit to Morrison HershfieldRipped screaming from the pages of a 2012 report, authored by Neil Norris,
Patrick Ropell, Mark Lawton
DIFFERENT VALUES FOR DIFFERENT TYPES
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TESTING & EVALUATIONA manufacturer’s tale of bringing innovation to the market
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FIRE PROTECTION – CLADDING BIG PICTURE
TO AVOID THIS…
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ANALYSIS AND TESTING – FIRE PERFORMANCE
ENGINEERING ANALYSIS – FIRE PERFORMANCE:Spacer is acceptable for use in:
A WALL REQUIRED TO BE BUILT OF NON-COMBUSTIBLE CONSTRUCTION INCLUDING PERMITTED COMBUSTIBLE CLADDINGS (METAL COMPOSITE MATERIALS) ALSO, IN COMBUSTIBLE CONSTRUCTION (OBVIOUSLY)
Maintains the two code (and common sense) objectives, which are:
CANNOT ALTER INTENDED FIRE PERFORMANCE OF NON-COMBUSTIBLE WALL CLADDING MUST STAY-IN-PLACE EVEN IF THE COMPONENT IF DAMAGED
No.1 is clear by analysis, and can be further supported by testing
No.2 is clear by observation – direct fastening
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CANADIAN CODE EVALUATION / COMPLIANCE
BURNABY
• Code appeal process
• BC Building and Safety Standards Branch – published approval
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CANADIAN CODE EVALUATION
MINOR COMBUSTIBLE COMPONENT
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IAPMO
“IT’S A WASHER”OH YEAH… GREAT!
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CODE COMPLIANCE: IAPMO-UES REPORT
THIRD PARTY CERTIFICATION OF THE CASCADIA CLIP
APPROVES CLIP FOR USE IN IBC TYPES I, II, III, IV, AND V CONSTRUCTION
ICC-ES EQUIVALENT
LOOKS AT SEVERAL DIFFERENT ASPECTS OF DESIGN
ONLY CLIP SYSTEM WITH A NATIONALLY RECOGNIZED THIRD PARTY CODE COMPLIANCE REPORT
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FIRE PERFORMANCE - TESTING
NFPA 285 TESTFIRE PROPAGATION IN EXTERIOR WALLFULL-ASSEMBLY TEST
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FIRE PERFORMANCE - TESTING
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SOLID PASS WITH MCM PANELS
FIRE PERFORMANCE – NFPA 285 RESULTS
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SOLID PASS WITH MCM PANELS
FIRE PERFORMANCE – NFPA 285 RESULTS
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FOR FIRE PERFORMANCE
CONCLUSION: THE CLIP DOES…NOTHINGAND THEREFORE CHANGES NOTHING.
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INTERTEK LISTING WITH ROXUL
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A LENS TO JUDGE
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A HISTORY OF CLIP DESIGNThe past through the present
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THE PROBLEM
OK, SO WE HAVE A CONDUCTIVITY PROBLEM…
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STEP 1
Backup wall
Fiberglass
Z-girt
Insulation
Let’s use a material with very low conductivity –like fiberglass.
MAIN PROBLEM: PULL OUT STRENGTH
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STEP 2
MAIN PROBLEM: COMBUSTIBILITY
Backup wall
Use long screw to attach outer steel directly to stud
Backup wall
PROBLEM: ROTATION AT INNER LEG
PROBLEM: WEB/SCREW INTERFERENCE
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STEP 3
PROBLEM: STILL A CONTINUOUS MEMBER (TOO EXPENSIVE AND POOR THERMAL PERFORMANCE)
Make pieces intermittent
Backup wall
Section
PROBLEM: INSTALLATION IS INCONVENIENT, TOO MANY PIECES
PROBLEM: WEAK FURRING SHAPE, DOES NOT PROVIDE DRAINAGE CAVITY
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STEP 4
Backup wall
IF WE USE A Z-GIRT INSTEAD… IS IT DONE?
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• Essentially a “thermal washer”
• Universal solution for almost any cladding (up to around 30 psf)
• For non-combustible construction
THE CASCADIA CLIP
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WHY MINERAL WOOL?
• R-4.2 to 4.3/inch (stable)
• Non-combustible
• Permeable to liquid water and water vapour (outdoor ok)
• Perhaps the most over-looked but critical characteristic:
TOLERANT OF SUBSTRATE IRREGULARITIES
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CHOOSING AN APPROACHMetal, composite, installation, adjustability, costs
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PROS & CONS - METAL
CASCADIA CLIP®
• Adjustability happens entirely outboard of the insulation
• Cladding attachment is a Z or a hat, both incredibly strong shapes
• Cascadia Clip matches insulation, thermal break for entire depth of insulation
• Cascadia clip maintains thermal performance even at very tight spacing
METAL CLIP & RAIL SYSTEMS• Adjustable rails penetrate insulation
• L-angle cladding attachment not very strong (much more likely to deflect)
• Thermal break is only a small portion of insulation depth
• Thermal performance relies on large spacing of clips: not always possible with various claddings
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PROS & CONS - COMPOSITES
Improves PSI or CHI value effects when a building has configurations that increase Clip spacing necessarily, such as:
• Windows
• Doors
• Corners
• Balconies
• Curves
TAKE-AWAY: COMPOSITE MATERIALS MAKE THIS NEARLY A NON-ISSUE
Aluminum ~160 W/mK
Steel ~60 W/mK
Stainless Steel ~14 W/mK
Fiberglass – 0.15 to 0.30 W/mK
Wood ~0.10 to 0.15 W/mK
Insulation Materials 0.022 to 0.080 W/mK
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PROS & CONS - COMPOSITES
CASCADIA CLIP®
Screws directly fastened through the centre of the clip:• Screws reduce thermal performance slightly
(allowably)
• Screws allow for non-combustible construction
STRENGTH COMES FROM SCREWS, THICK FIBERGLASS ALLOWS FOR SHEAR SUPPORT – UP TO 30PSF CLADDING
COMPOSITE SYSTEMS• Best thermal performance
• Combustible structural connection, generally lower strength than metal
• Thinner webs mean lower strength
• Pull out may be an issueInsulation
Fiberglass
Z-girt ?
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PROS & CONS – ADJUSTABILITY
WHEN IS THIS REQUIRED VS JUST WASTED EFFORT?
NOT EVERY SUBSTRATE IS AS IRREGULAR AS CONCRETENOT EVERY CLADDING NEEDS ADJUSTABILITYSOME DO…
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SINGLE Z-GIRTSOUR INDUSTRY HAS BUILT A LOT OF WALLS WITHOUT ADJUSTABILITY
THE TIMES THAT YOU NEEDED ADJUSTABILITY STICK OUT IN EVERYONE’S MIND
IT IS NATURAL TO REMEMBER LIKE THIS
PROS & CONS – ADJUSTABILITY
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PROS & CONS – ADJUSTABILITY
THE COST OF ADJUSTABILITYADJUSTABILITY MEANS MANY PIECES
ADJUSTABILITY TAKES EXTRA LABOUR
IDEALLY, WE WOULD ONLY EXPEND THIS EFFORT AND COST WHEN NEEDED
AN ON-DEMAND SOLUTION IS BEST
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ON-DEMAND ADJUSTABILITY
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FINANCIAL ADVANTAGES
FOR THE ARCHITECT:• Risk management – most testing and full code-evaluation
• Reliability of metal connections
• Least drop in performance when spacing becomes dense
FOR THE CONTRACTOR:• Intermittent pieces save material cost
• Pre-assembly saves labour cost
• On-demand adjustability avoids unnecessary complexity
CASCADIA CLIP COMBINES THESE, AND IS THE LOWER POSSIBLE COST PER R-VALUE
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QUESTIONS& COMMENTS?
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CASCADIA CLIP®
High-profile and interesting projects across the US
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STATE UNIVERSITY OF NEW YORK- MEDICAL SCHOOL
• 8 stories• 540,000SF• 2” blue & 4” red clips• Horizontal type• Largest building constructed in
Buffalo in decades• Designed by HOK
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BULLITT CENTER
• 6 stories• 52,000SF• 3.5” orange clips• Horizontal type• First Living Building Challenge certified
commercial building in North America• Designed by Miller Hull Partnership
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• 11 stories• 735,000SF• 3” purple clips• Horizontal type• LEED Platinum Certified• Clips only used on soffit (middle
building)• Designed by Clayco
ZURICH NORTH AMERICA HEADQUARTERS
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• 12 stories• 650,000SF• 3.5” orange clips• Vertical type• LEED Platinum• Designed by SERA Architects and CO
Architects
PORTLAND UNIVERSITY- COLLABORATIVE LIFE SCIENCES BUILDING
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MIT- NANOSCALE RESEARCH BUILDING
• 4 stories• 200,000SF• 3.5” orange clips• Horizontal type• Two floors of high- performance cleanrooms• Designed by Wilson Architects
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COX HEALTH – MEDICAL CENTER SOUTH
• 10 stories• 310,000SF• 3.5” orange clips• Vertical type• Includes women’s and children’s hospital
as well as neuroscience center• Designed by Beck Group
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DENVER BOTANIC GARDENS SCIENCE PYRAMID
• Pyramid structure• 5,300SF• 4” red and 5” yellow clips• Vertical type• Highly unique sloped roof/wall construction• Designed by BURKETTDESIGN
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PHOENIX AIRPORT- TERMINAL 3 MODERNIZATION
• 3 stories• 676,000SF• 3.5” orange clips• Vertical type• New high-performing terminal in
three phases to replace outdated existing terminal
• Designed by DWL Architects, Corgan, and Smithgroup JJR
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MENIL DRAWING INSTITUTE
• 1 story• 30,000SF• 4” red clips• Horizontal type• First exhibition space of its kind• Designed by Johnston Marklee
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FAIRMONT STATE UNIVERSITY- UNIVERSITY TERRACE
• 4 stories• 110,000SF• 2” blue clips• Vertical type• University housing project• Designed by McKinley & Assosciates,
AECOM and Triad Engineering
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