achieving high performance through building enclosure ... · the building commissioning association...
TRANSCRIPT
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Eric J. Seaverson, P.E.Director, Building Science Solutions, Intertek
Achieving High Performance through Building Enclosure commissioning (BECx)
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AIA Quality Assurance
The Building Commissioning Association is a Registered Provider with The American Institute of Architects Continuing Education Systems (AIA/CES). Credit(s) earned on completion of this program will be reported to AIA/CES for AIA members. Certificates of the Completion for both AIA members and non-AIA members are available upon request.
This program is registered with 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.
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AIA CES - Course Description
While commissioning of many building systems has been around for many years, Building Enclosure Commissioning (BECx) is newer to the design and construction industries, and requirements continue to change. This presentation will provide a primer on the practice of BECx and its benefits with real world case studies and then dive further into the various approaches as defined by industry standards and code.
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Learning ObjectivesUpon completing the course participants will be able to:1. Describe the process of BECx and typical deliverables, with an
understanding of the potential value the process may bring to a project
2. Explain the Building Enclosure Commissioning process as they apply to the LEED rating system and current standards
3. Describe scheduling challenges when incorporating BECx in to projects.
4. Summarize the coordination efforts between BECx and mechanical systems.
5. Describe the general function and performance requirements of the building enclosure.
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Copyright Materials
This presentation is protected by US and International Copyright laws. Reproduction, distribution, display and use of the presentation without written permission of the speaker is prohibited.
© Intertek 2019
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Building Enclosure Commissioning (BECx)
01 What is the Building Enclosure?02 What is BECx?03 Functional Performance Verification04 BECx Process05 Case Studies
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01 What is the Building Enclosure?
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The Building Enclosure
Shelter
ServiceabilityDurabilityEnergy & Comfort
SecurityAestheticsShelter
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Building enclosures are designed to separate interior from exterior.
Environmental Separation
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The Building Enclosure
Control LayersBuilding Enclosures are designed to control multiple loadings this presentation will primarily be concerned with the following in order of importance:
1. Water Control Layer2. Air Control Layer3. Vapor Control Layer4. Thermal Control Layer
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The Building Enclosure
ASHRAE 90.1-2016
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Energy Modeling & BECx
HVAC or Enclosure?
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The Building Enclosure
Credit: Journal of Building Enclosure Design Summer 2011 “Improvement of Air Tightness in U.S. Army Buildings” pgs. 11-13
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The Building Enclosure
Materials• ASTM E2178• 0.004 cfm/ft2 (75 Pa)Testing of air barrier materials is necessary but not sufficient to obtain performance.
Assemblies• ASTM E2357• 0.04 cfm/ft2 (75 Pa)Testing of assemblies is essential to demonstrate performance of designed assembly.
Whole Building• ASTM E779• 0.40 cfm/ft2 (75 Pa)Only assessment of installed performance, including materials, assemblies, and complete systems.
Air Control Layer
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The Building EnclosureAir Infiltration Requirements
cfm/ft2 @ 0.3 in w.g. (75 Pa)
Materials(ASTM E2178 or CAN/ULC-S741)
Assemblies(ASTM E2357/
CAN/ULC-S742, or E1677)
Whole Building(ASTM E779 or
CAN/CGSB 149.15 )
NBC (National Building Code of Canada, 1990) 0.004 -- --
Massachusetts, Minnesota, etc… 0.004 -- --
ASHRAE 90.1 (2013) 0.004 0.04 0.40
USACE(2008); NAVFAC (2011) 0.004 -- 0.25Washington State (2010) 0.004 -- 0.40GSA (2010) USAF (2011) 0.004 0.04 0.40
ASHRAE189.1 (2009) IECC (2012) 0.004 0.04 0.40
IgCC (2012) -- -- 0.25
State of Utah (HPBS) 0.004 0.04 0.1
or
Abbreviations: ASHRAE – American Society of Heating, Refrigeration and air Conditioning Engineers; USACE - US Army Corps of Engineers; GSA - General Services Administration; NAVFAC - Naval Facilities Engineering Command; USAF- United States Air Force; IgCC – International Green Construction Code
or AND
or
ANDor
© E. I. DuPont de Nemours and Company 2014. All rights reserved
or
or AND
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The Building Enclosure
ASHRAE 90.1-2016
Complex Simple
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The Building EnclosureHistoric Building Enclosure• Simpler building systems• Fewer layers• Master tradesmen• Apprenticeship training• Lower Expectations?
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The Building EnclosureToday’s Building Enclosure• Complex building materials• Multi-layer construction /
multiple trades• Thinner construction• Limited on-the-job training• Higher expectations• Schedule Critical• Cost Sensitive
http://www.mgac.com/projects/house-of-sweden/33
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The Building EnclosureToday’s Building Enclosure
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02 - Building Enclosure Commissioning (BECx)
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Building Enclosure Commissioning
Whole Building Commissioning
Electrical
BuildingEnclosure
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Building Enclosure Commissioning
“Building Enclosure Commissioning (BECx) is a process that begins with the establishment of the Owner’s Project Requirements (OPR) and endeavors to ensure that the exterior enclosure and those elements intended to provide environmental separation within a building or structure meet or exceed the expectations of the Owner.”
- ASTM E2813-2012
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Building Enclosure Commissioning
Process
VerifiesEnclosure
Performance
Owner Project Requirements
Building Operation
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Leaks
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Insert copy Insert copy Insert copy Insert copy
Air Quality / Health
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Solar Heat Gain U-Factor Air Leakage
Energy Conservation
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Thermal DiscontinuitiesEnergy Conservation
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Saving Time
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03 - BECx Process
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BECx Process
Pre-Design Design Procurement Construction Operation & Maintenance
Commissioning Process
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Building Enclosure Pre-Design Services
• Introduce BECx process• Objectives• Tasks and milestones• Responsibilities
Project Planning Conference
• Establish enclosure performance criteriaOwner’s Project Requirements (OPR)
• Roles and responsibilities• Communication protocols• Format for reporting
BECx Plan
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Pre-Design Phase – Scheduling/Coordination
• Engagement/Schedule: The sooner the better… LEED V4.1 – OPR & BOD review/development is required (before Permit
Set) [Fundamental] Design Review◦ Fundamental: Start of DD; one (1) review◦ Enhanced: Start of SD; three (3) design reviews
• Coordination: Understanding the mechanical systems and environmental conditions Building pressurization Heating/cooling methods at exterior walls Interior temperature and relative humidity
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Building Enclosure Pre-Design Services
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Building Enclosure Pre-Design Services
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Building EnclosureDesign Services
• At multiple phases: SD, DD, CD• Review drawings and specifications• Comment on water, air, thermal, and vapor control• Review for compliance with OPR (Owner’s Project Requirements)
and the Basis of Design (BOD)
Design Review(s)
• Incorporate BECx requirements into the CDs:• Building Enclosure Commissioning (BECx) specification• Functional Performance Test (FPT) specification
• Update BECx and FPT specifications each design phase
Construction Documents
• Update the OPR• Update the BECx Plan• Building enclosure systems maintenance manual
Other BECx Activities
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Design Phase – Scheduling/Coordination
• Schedule and Coordination: No significant differences Continue coordination from Pre-Design Phase
• Process: Design reviews are visual; comments alone don’t suffice (such as in CxAlloy) Drawings must be provided to “show” the comments
• LEED V4.1 Testing is required, unless…
Fundamental EnhancedAcoustic Performance
Air Leakage
Thermal Performance
Water Penetration
Sealant Durability
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Building EnclosureDesign ServicesDefining the Building Enclosure
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Building EnclosureDesign Services
Defining the Performance
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Building EnclosureDesign Services
Control Layers1. Water2. Air3. Vapor4. Thermal
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Building EnclosureDesign Services
Design ReviewMake sure we are sealing to the air barrier...but also make sure to tie-in with the primary seal line of the curtain wall/window system.
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Insert copy
Parapet Cap
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Extended Curtain Wall
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Soffits
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Building EnclosureDesign Services
Hygrothermal Analysis
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Laboratory Certification vs.Construction Performance Completely focused on the
specific component / product
Does not include adjacent construction integration (i.e. not project focused)
Determines the “primary seal” location(s) during construction to achieve air infiltration rating
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Building EnclosureDesign Services
Performance Mockups
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Building EnclosureDesign Services
BECx Specification
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Building EnclosureDesign Services
FunctionalPerformance TestSpecification
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Functional Performance Testing
Performance Requirements• Building Enclosure Functional
Performance Testing Specification Section
• This Section shall supersedeother Sections where contradictions occur
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Building EnclosureConstruction Services
• BECx kickoff meeting• Preconstruction meetingsMeetings
• Submittals• RFI, ASI, CCD• Change Order• Substitution Request• Value Engineering
Review for Compliance with the OPR and Contract
Documents
• Construction• Observation• Testing
Mockup
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Building EnclosureConstruction Services
• Verifying compliance with:• Contract documents• Submittals and shop drawings• Product installation instructions• Industry standards
Field Observations
• Verify the performance of the systems (including interfaces)• Verify installation methods• Avoid late stage (expensive) problems with early detection.
Functional Performance Verification
• BECx meetings to review building enclosure schedule, testing, and Issues
• Update OPR and BECx plan• Review contractor checklists• Construction phase BECx report
Other BECx Activities
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Construction Phase – Scheduling/Coordination
• Schedule: BECx “fully” engages before MEP Cx (based on construction) Mockups must be constructed early in the construction phase (before
construction) Enclosure schedule is ever changing; goal oriented to “watertight” (not
complete/functional)◦ Challenges in performance testing scheduled (need complete work)
• Coordination: Similar to design phase, submittal/shop drawing reviews are “visual”
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Building EnclosureDesign Services
Submittal Reviews
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Pre-Construction Phase
Value of Mock-ups:• Verify the performance of the systems• Set construction standards• Establish sequencing of work• Verify material selection
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Surface Preparation
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Building EnclosureDesign ServicesField Observations
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Building EnclosureDesign Services
Issue Communication, Tracking, and Resolution
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O & M Phase
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O&M Phase – Scheduling/Coordination
• Schedule/Coordination:• BECx is typically “long-gone” at substantial completion; need to
remember 10-month visit
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04 - Functional Performance Verification
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AAMA 501.2 “Nozzle Testing”
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ASTM E783 Air Leakage Windows and Doors
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ASTM E1105 “Spray Rack”
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ASTM E1186 (4.2.6) “Smoke Tracer”
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Functional Performance TestingASTM E1186, Practice 4.2.7
• Standard Practices for Air Leakage Site Detection in Building Envelopes and Air Barrier Systems – Chamber Depressurization in Conjunction With Leak Detection Liquid
• Qualitative Air Infiltration/Exfiltration Test
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ASTM E779 Whole Building Air Leakage Test
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ASTM E1186 (4.2.1) “Infrared Thermography”
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05 - Case Studies
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• Built in 1980’s• Active water and air leakage• Client is upgrading building to
increase commercial leasing value/solve problems.
Case Study 1 - Philadelphia
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• Existing BECx starts with an investigation
• Mock-ups were key to verifying repair scope
• New windows, insulation, air barrier, roof, existing cladding to remain
• Air leakage rate decrease by 10x
Case Study 1 – Philadelphia
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• Built in 1940’s• 14 stories; 460,000 sf• Concrete encased steel frame• Client is upgrading building to
change use from manufacturing to education
• Client looking to greatly increase energy performance
• Minor façade repairs
Case Study 2 – New York City
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• Existing BECx starts with an investigation
• Mock-ups were key to verifying repair scope
• New windows, insulation, air barrier, roof, existing cladding to remain
• Air leakage rate decreased by 10x
Case Study 2 – New York City
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Project Location
Case Study 3 – New Jersey
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Case Study 3 – New Jersey
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Glass Fabrication
Energy Usage Design Construction OperationsDefining BECx Case Study
Case Study 3 – New Jersey
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Mock-up Testing
Case Study 3 – New Jersey
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Project Location
Case Study 3 – New Jersey
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414-758-4998
intertek.com/building
Thank You!
Eric J. Seaverson, P.E.Director – Building Science SolutionsIntertek