Greg Labbe of BlueGreen consulting showcases many quality control issues with new housing construction. Presented to the Toronto Certified Sustainable Building Advisor Program
The document describes the design process for a wall bracket to securely attach a child safety gate to the wall. It goes through the phases of identifying problems with existing gates, concept development and prototyping. An initial prototype was created through rapid prototyping to test the design. The final design will be manufactured using injection molding, which requires creating a mold. The document discusses the injection molding process and provides a basic cost analysis.
Soft Landings is the BSRIA-led process designed to assist the construction industry and its clients deliver better buildings. This presentation shows the latest best practice in building handover including lessons learned from project using Soft Landings
Don't Let PCBs Manage You: Tips For Handling A Potentially Contaminated Workp...Triumvirate Environmental
A 5 part guide that will teach readers what they need to know about PCBs before determining whether they should test and tactics for how PCBs can be managed.
The science-behind-better-building-enclosures-chicagoROCKWOOL
ROXUL® Building Science, Dörken Systems and RDH Building Science Laboratories’ John Straube discussed and shared in resolving common problems related to building design and construction. This full day 5 CONTINUING EDUCATION LEARNING UNITS seminar covered:
Key building science principles
Critical design strategies for improved energy efficiency,
Examples of best practice details and specifications,
Emerging issues and trends.
We all want the dream - a beautiful remodel, done in an hour, without noise, dust, decisions or costs, but then we awake to discover a far different reality than what was portrayed in the media. Before you start your next remodeling project, level set your expectations to maximize your enjoyment of the experience. The team at RRS Design + Build, LLC will help you find the balance.
Elements Of A Masonry Forensic Investigation Ryan BiggsMartin Demarest
The document discusses the key elements of conducting a forensic investigation of masonry, including:
1) Why an investigation is needed to understand the reality of any issues versus perceptions, and when it's appropriate to initiate one.
2) Choosing an experienced investigator who can conduct non-destructive testing using tools like ultrasonics, thermography, and radar to evaluate the masonry in an unbiased manner.
3) What to expect from the investigation process, including reviewing documents, visual observations, testing, and a final report of findings.
The document discusses project rating systems for green buildings, focusing on the LEED for Homes system. It provides an overview of project rating systems in general and their benefits. LEED is described as the leading certification system in the US. The costs associated with certification are outlined. An example project, 301 Madison St, is summarized which achieved a Gold rating under LEED for Homes. Key lessons are that a modest, well-designed home can achieve high ratings, and that verification is important.
The document describes the design process for a wall bracket to securely attach a child safety gate to the wall. It goes through the phases of identifying problems with existing gates, concept development and prototyping. An initial prototype was created through rapid prototyping to test the design. The final design will be manufactured using injection molding, which requires creating a mold. The document discusses the injection molding process and provides a basic cost analysis.
Soft Landings is the BSRIA-led process designed to assist the construction industry and its clients deliver better buildings. This presentation shows the latest best practice in building handover including lessons learned from project using Soft Landings
Don't Let PCBs Manage You: Tips For Handling A Potentially Contaminated Workp...Triumvirate Environmental
A 5 part guide that will teach readers what they need to know about PCBs before determining whether they should test and tactics for how PCBs can be managed.
The science-behind-better-building-enclosures-chicagoROCKWOOL
ROXUL® Building Science, Dörken Systems and RDH Building Science Laboratories’ John Straube discussed and shared in resolving common problems related to building design and construction. This full day 5 CONTINUING EDUCATION LEARNING UNITS seminar covered:
Key building science principles
Critical design strategies for improved energy efficiency,
Examples of best practice details and specifications,
Emerging issues and trends.
We all want the dream - a beautiful remodel, done in an hour, without noise, dust, decisions or costs, but then we awake to discover a far different reality than what was portrayed in the media. Before you start your next remodeling project, level set your expectations to maximize your enjoyment of the experience. The team at RRS Design + Build, LLC will help you find the balance.
Elements Of A Masonry Forensic Investigation Ryan BiggsMartin Demarest
The document discusses the key elements of conducting a forensic investigation of masonry, including:
1) Why an investigation is needed to understand the reality of any issues versus perceptions, and when it's appropriate to initiate one.
2) Choosing an experienced investigator who can conduct non-destructive testing using tools like ultrasonics, thermography, and radar to evaluate the masonry in an unbiased manner.
3) What to expect from the investigation process, including reviewing documents, visual observations, testing, and a final report of findings.
The document discusses project rating systems for green buildings, focusing on the LEED for Homes system. It provides an overview of project rating systems in general and their benefits. LEED is described as the leading certification system in the US. The costs associated with certification are outlined. An example project, 301 Madison St, is summarized which achieved a Gold rating under LEED for Homes. Key lessons are that a modest, well-designed home can achieve high ratings, and that verification is important.
Livio Nichilo of Internat Energy Solutions presents integrated renewable energy strategies for buildings. Presented to the Toronto Certified Sustainable Building Advisor program.
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This presentation looks at common issues encountered with DMSO-solvated compounds in HTS libraries and, current methods for identifying and tracking these issues. It also introduces applications of a novel high resolution and imaging processing instrument (HIAPI) for rapid assessment and quality control of HTS library compound library quality.
Building Science & Residential Envelopesjeff_ranson
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Sensory evaluation refers to evaluating food using human senses. It is done to develop new products, improve existing ones, ensure quality standards, and determine consumer acceptance. Components of a food composition table are also discussed. Methods of cooking can make food healthier by using less oil and having shorter cooking times to retain nutrients. Ingredients can be substituted to reduce saturated fat and increase fiber. Food presentation and flavoring are also important to make dishes more appealing.
This document discusses food quality parameters and methods for analyzing food products. It outlines factors that contribute to food quality like appearance, taste, and nutritional value. Physical, chemical, and microbiological tests are used to analyze raw materials and finished products to ensure safety and purity. Parameters like moisture, fat, protein, and packaging materials are evaluated using methods like the hot air oven test and chemical analysis. Instrumental techniques like gas chromatography-olfactometry and electronic nose are also used to objectively measure organoleptic properties and identify volatile compounds that influence flavor.
DevSecCon Boston 2018: Technical debt - why I love it by Mike BursellDevSecCon
The document discusses technical debt in software projects. It defines technical debt as compromises made in a project's design or implementation that are known to require future work. These compromises arise due to lack of time, resources, requirements or expertise. The speaker argues that acknowledging technical debt is beneficial because it allows the issues to be documented, addressed through future work, and prevents blame. The document provides recommendations for managing technical debt, such as reserving time for discussion and encouraging honest documentation of compromises made during a project.
EAGA Company provides real estate development and construction management services, including design management, estimating and bidding, contract management, construction management, and closeout services. They offer initial consultations at no charge and charge fees ranging from $1,000-$3,000 for design management and 7% of construction costs for full construction management. Their services are aimed at helping clients develop real estate investment properties, coordinate contractors, and ensure successful project completion on time and on budget.
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This document provides information about a chemical plant equipment design course. It includes the course instructor's contact details, teaching methods, learning outcomes, and textbook. The introduction lecture covers process synthesis and design approaches, including modifying existing structures, sequentially building up new structures, and superstructure optimization. It also discusses process synthesis tools and the design process. The lecture introduces key considerations for materials selection like mechanical properties, temperature effects, corrosion resistance, and costs. Common engineering materials like metals, ceramics, polymers, and composites are outlined. Standards and specifications for materials are important for interchangeability and design.
This document provides guidance on achieving LEED for Homes certification. It emphasizes understanding the LEED program and process, using integrative design, modeling energy performance early and often, prioritizing elements like siting and the building envelope, and setting clear expectations with all parties involved. Integrative design is highlighted as crucial for reducing costs while improving sustainability. Key roles like those of the green rater and energy consultant are also outlined.
This document provides an overview of LEED certification and how it relates to transportation demand management (TDM). It discusses what LEED and the USGBC are, the different types of LEED certification, who pursues certification, and the benefits. It outlines opportunities for TDM within LEED, including points available for alternative transportation access, bicycle accommodations, and parking. The document provides tips for conducting LEED-compliant transportation surveys and strategies for working smarter to help projects achieve LEED points through TDM measures.
Livio Nichilo of Internat Energy Solutions presents integrated renewable energy strategies for buildings. Presented to the Toronto Certified Sustainable Building Advisor program.
Addressing Quality Control Issues in Day-to-Day HTS Compound Management Opera...Pierre Baillargeon
This presentation looks at common issues encountered with DMSO-solvated compounds in HTS libraries and, current methods for identifying and tracking these issues. It also introduces applications of a novel high resolution and imaging processing instrument (HIAPI) for rapid assessment and quality control of HTS library compound library quality.
Building Science & Residential Envelopesjeff_ranson
The document summarizes a presentation on building envelopes. It discusses the physics of heat, air, and moisture transfer and how they relate. It covers various risks of inadequate envelopes like moisture problems. It also reviews concepts like vapor diffusion, vapor retarders, rain penetration strategies, and drying. The goal is to understand building science principles to design better, more durable building envelopes.
The document discusses designs for an alarm clock that wakes a person without disturbing others and a social gathering restaurant and classroom table. It proposes using light to wake someone based on the body's circadian rhythm being influenced by light. For the alarm, it suggests using gradually increasing light levels from a light source. The restaurant would assign diners to tables with strangers to help integrate teens. The classroom table aims to better facilitate group work and discussion through its design.
The Building Science of Thermal ComfortBronwyn Barry
An incomplete review of thermal comfort, thermodynamics, indoor air quality, who influenced this science and how it is being used to design insanely comfortable buildings. Bonus side benefit: they happen to use very little energy. (Don't tell anyone about this - it may be too radical.)
The document discusses measures to increase water use efficiency in Indian agriculture. It notes that agriculture accounts for 80-84% of water consumption in India but has low productivity and efficiency. Key challenges include limited technical capabilities, lack of capital, and inability to recover costs. Methods to improve efficiency include improving storage systems, conveyance infrastructure, and on-farm irrigation techniques. These involve reducing evaporation, seepage, waterlogging, and employing micro-irrigation, treated wastewater reuse, and growing less water-intensive crops. The document anticipates irrigation efficiency could increase to 50-60% for surface water and 72-75% for groundwater by 2025-2050 through these measures.
Thesis -International Cruise Terminal in GoaSanah Patel
This document provides an overview of a thesis on designing an international passenger cruise terminal in Mormugao, Goa. It includes an introduction to cruise tourism, the need for studying this topic, the aims and objectives of the thesis, its scope and limitations, and the methodology. The introduction defines cruise tourism as traveling for leisure to various destinations on a ship. It notes that India's main international cruise destinations currently are Mumbai, Goa and Cochin, but that the existing terminal buildings do not meet international standards. The thesis aims to design a new terminal in Goa that can serve as an intermediate port for international cruises and a destination for domestic cruises.
This document discusses indoor air quality and indoor air quality management. It defines indoor air quality and notes that it can be affected by gases, particulates, and microbial contaminants. The primary methods for improving indoor air quality are identified as source control, filtration, and ventilation. Common indoor air pollutants such as second-hand smoke, radon, molds, and carbon monoxide are also discussed. Health effects of poor indoor air quality and sick building syndrome are summarized.
Sensory evaluation refers to evaluating food using human senses. It is done to develop new products, improve existing ones, ensure quality standards, and determine consumer acceptance. Components of a food composition table are also discussed. Methods of cooking can make food healthier by using less oil and having shorter cooking times to retain nutrients. Ingredients can be substituted to reduce saturated fat and increase fiber. Food presentation and flavoring are also important to make dishes more appealing.
This document discusses food quality parameters and methods for analyzing food products. It outlines factors that contribute to food quality like appearance, taste, and nutritional value. Physical, chemical, and microbiological tests are used to analyze raw materials and finished products to ensure safety and purity. Parameters like moisture, fat, protein, and packaging materials are evaluated using methods like the hot air oven test and chemical analysis. Instrumental techniques like gas chromatography-olfactometry and electronic nose are also used to objectively measure organoleptic properties and identify volatile compounds that influence flavor.
DevSecCon Boston 2018: Technical debt - why I love it by Mike BursellDevSecCon
The document discusses technical debt in software projects. It defines technical debt as compromises made in a project's design or implementation that are known to require future work. These compromises arise due to lack of time, resources, requirements or expertise. The speaker argues that acknowledging technical debt is beneficial because it allows the issues to be documented, addressed through future work, and prevents blame. The document provides recommendations for managing technical debt, such as reserving time for discussion and encouraging honest documentation of compromises made during a project.
EAGA Company provides real estate development and construction management services, including design management, estimating and bidding, contract management, construction management, and closeout services. They offer initial consultations at no charge and charge fees ranging from $1,000-$3,000 for design management and 7% of construction costs for full construction management. Their services are aimed at helping clients develop real estate investment properties, coordinate contractors, and ensure successful project completion on time and on budget.
The document discusses the REEP (Refurbishment Evaluation and Prioritisation Process) tool for evaluating existing buildings and deciding which to refurbish versus demolish when undertaking a design project involving both new construction and refurbishment. The REEP process involves workshops with key stakeholders to identify priorities, score existing building elements, and select a preferred refurbishment option. It provides a consistent, flexible approach that considers functionality, sustainability, and life cycle costs to optimize design excellence and value.
This document provides information about a chemical plant equipment design course. It includes the course instructor's contact details, teaching methods, learning outcomes, and textbook. The introduction lecture covers process synthesis and design approaches, including modifying existing structures, sequentially building up new structures, and superstructure optimization. It also discusses process synthesis tools and the design process. The lecture introduces key considerations for materials selection like mechanical properties, temperature effects, corrosion resistance, and costs. Common engineering materials like metals, ceramics, polymers, and composites are outlined. Standards and specifications for materials are important for interchangeability and design.
This document provides guidance on achieving LEED for Homes certification. It emphasizes understanding the LEED program and process, using integrative design, modeling energy performance early and often, prioritizing elements like siting and the building envelope, and setting clear expectations with all parties involved. Integrative design is highlighted as crucial for reducing costs while improving sustainability. Key roles like those of the green rater and energy consultant are also outlined.
This document provides an overview of LEED certification and how it relates to transportation demand management (TDM). It discusses what LEED and the USGBC are, the different types of LEED certification, who pursues certification, and the benefits. It outlines opportunities for TDM within LEED, including points available for alternative transportation access, bicycle accommodations, and parking. The document provides tips for conducting LEED-compliant transportation surveys and strategies for working smarter to help projects achieve LEED points through TDM measures.
Increase Profits & Meet Demands with High Performance Multifamily SolutionsKEPHART
Today's multifamily communities can be cutting edge and sustainable without breaking the bank. High performance practices have moved well beyond the basics of recycling programs and low-flow toilets, and savvy condo buyers and renters are demanding high performance features and amenities. Further, new technologies on the market can help affordably track efficiency and benchmark cost savings on individual maintenance systems and the building as a whole. In this session, you'll discover how to fulfill the demands of consumers while meeting the needs of property owners and managers; and learn what features, products, materials and construction techniques will help reduce maintenance costs, lower impact fees and decrease utility costs.
The document provides an overview of Lean Construction principles and techniques. It discusses how Lean aims to eliminate waste and optimize workflow. Specific Lean tools are explained, like 5S, visual controls, pull systems, and Last Planner System. Case studies show Lean reducing costs by 15-30% by improving coordination, reliability, and reducing waste. Customers now expect Lean approaches to manage risk and improve outcomes.
The document summarizes a discussion on improving vehicle lightweighting efforts. It identifies problems with current engineering and manufacturing models, including a lack of experience due to job losses and the separation of engineering and manufacturing teams. It proposes blending engineering and manufacturing teams, with 30% of engineers having manufacturing experience. It also stresses the importance of team building. Finally, it outlines a generic weight reduction model involving establishing rules, gathering data, assembling teams of specialists, targeting opportunities, implementing changes, and validating the results.
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Similar to Greg Labbe: quality control issues in housing construction (20)
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Architectural and constructions management experience since 2003 including 18 years located in UAE.
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tender analyses.
Consulting with clients, work on formulating equipment and labor cost estimates, ensuring a project
meets environmental, safety, structural, zoning, and aesthetic standards.
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Greg Labbe: quality control issues in housing construction
1. 12/04/2013
1
Putting Performance
Into Practice
April 12, 2013
Sustainable Building Advisor Course
Evergreen Brick Works, with Greg Labbé
ABOUT
Greg is a principal at
BlueGreen Consulting
Group Inc., offering high
performance energy
consulting and professional
services to architects and
builders, specialising in
building shell optimisation,
diagnostics, training and
testing.
2. 12/04/2013
2
Agenda
• Introduction
• Quality Management on the job site
• Who and what’s involved in:
– Design phase
– Construction phase
• On-site Testing and Inspecting
• Construction practices to avoid
• Conclusion
• Questions
Introduction
Building a sustainable, high
performance home starts at the design
phase and ends predictably with a
successful blower door test.
Let’s explore the steps in between to
learn more about what makes a high
performance, sustainably designed
home the best product on the market.
3. 12/04/2013
3
Introduction
A sustainable home means new
materials, methods techniques; are the
trades you hire up to the new
challenges? Do they know what to do?
A high performance home means you’re
raising the quality bar, always involves
setting a standard and measuring to it.
Performance isn’t this obvious.
Modeling optimises and testing proves it.
4. 12/04/2013
4
Students at Humber
College test the
Centre for Urban
Ecology (last week!).
It was LEED
certified, but never
air tightness tested.
ICI vs Residential
Quality Management
• Learning to build sustainably means
growing pains, yet>
• Contractors in the USA who switched to
high performance building found their
business grew as their peers businesses
continued to slide with the housing market.
5. 12/04/2013
5
Quality Management
• Quality is conformance to a written standard
• Quality is measured by the cost of non-
conformance
• It is cheaper to do things right the first time
• Most problems have roots in planning and
development
• Quality is shared by everyone from architect to
builder to site supervisors and the trades.
Philip Crosby, The Art of Making Quality Certain
What do the following 3 slides
have in common?
8. 12/04/2013
8
There’s a shortage of good
planning, clear specifications
and an even greater shortage of
trades who have time to think
things through.
Let’s review>
How do
we get
the door
open.
9. 12/04/2013
9
A window was
added after
the wall was
built. Note the
bracing was
cut…
The tiles were removed
because someone forgot
the floor heating element.
10. 12/04/2013
10
What’s the Cost?
• “Quality is free, but no one is ever going to know
it if there isn’t some sort of agreed-on system of
measurement.”
• “The purpose of calculating the cost of quality is
really only to get management’s attention and to
provide a measurement base for seeing how
quality improvement is doing.”
Quality is Free
• A quality program can save a company more
money than it costs to implement
• Profitability is best accomplished by reducing the
cost of poor quality and preventing defects
• Cost savings include prevention, appraisal, and
failure costs.
Philip Crosby, The Art of Making Quality Certain
11. 12/04/2013
11
Quality is a Standard
Pick a standard or rating system and follow it!
Differentiating yourself in the market place.
12. 12/04/2013
12
A note on Quality Programs
Two interesting articles on implementing quality
programs on construction sites:
1. Applying Lean Thinking to the Passive House
Process, David Hawkins & Russell Richman,
Ryerson University.
2. Achieving High Performance Homes Through
Quality Management, Duncan Prahl, Home
Energy Magazine, 2012
Who’s involved in:
Design phase
• Once you’ve picked your standard, you’ll
have to assemble your high-performance
team:
– 3rd party energy modeller with field experience
– Architects that are familiar with performance
– Builders that know their work will be tested
– A mechanical designer who knows “micro
load” systems
13. 12/04/2013
13
What’s involved in:
Design phase
• Specifications are decided on early as part
of the IDP.
• Super high efficiency houses differ in:
– May not have “typical” heating systems
– Are quiet, so mechanicals need to be too!
– Allocation of budgets are different in
sustainable builds.
What’s involved in:
Design phase
• Super high efficiency houses differ in:
– Materials are different
• VIG, Densepack cellulose
• Double stud wall, VIP
• Straw bale Rammed earth
– Techniques are different to avoid thermal
bridges with significantly different details..
>so different skill set needed
14. 12/04/2013
14
What’s involved in:
Design phase
• Last but not least, high performance
structures differ form ‘code built’ in:
– You need the get the building inspector on
side
– Building Officials typically don’t like new
things, but if you show establish a relationship
early, they will see the value.
What’s involved in:
Design phase
Plan for and expect push back unless the
contractor is experienced in the techniques as
well as their sub-trades.
If using a builder new to the techniques, bring
them in early to make them feel like they are
part of the decision making process.
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Design Phase: Simulations
Let’s look at the following, simplified example of a
wall section with a standard sized window in it.
10’
8’
2’
3’
R2 R20
Scenario 1: Consider a wall and a window…
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10’
8’
2’
3’
R2 R20
What’s the R value of the entire wall assembly?
10’
8’
2’
3’
R2 R20
Entire wall assembly only R12*!
*This calculation IGNORES the thermal bridging
at each stud, so it’s even worse!
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10’
8’
2’
3’
R2 R40
Composite R value: 16.5.
The window is dragging the R value
down; energy modeling identifies
these issues.
10’
8’
2’
3’
R8 R20
Reconsider Scenario 1: with a better window…
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Design Phase: Simulations
You cannot break the 2nd Law of Thermodynamics:
Heat goes from more to less.
Heat will find a way through “cheap” bridging
elements or features dragging the overall
performance down.
Luckily, good energy modeling can help you make
tough choices!
Design Phase: Simulations
High performance doesn’t just happen; it evolves
through an iterative process like the Integrated
Design Process (IDP).
This process is usually lead by a professional
intimately familiar with the standard you’ve chosen.
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Design Phase: IDP+Simulations
Design Phase: IDP
The design team, homeowner and builder sit
with the energy simulator professional.
Together, they go through an iterative
process of optimisation where performance
is optimised and building costs are
minimised or as Paul Dawkins says
“tunneling through the cost barrier.”
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Design Phase: Optimised
• Out of this IDP process, the final plans are
issued and the specifications for the
following are set:
– The R values and assembly details for the
whole building shell including the slab
– The air leakage threshold
– Exacting window specifications for each
façade.
– A short list of mechanicals
Design Phase: Optimised
"We need to use integrated design process
that can create new approaches and tools,
and beautiful environments that can restore
social, economic, and environmental vitality
to our communities."
— Bob Berkebile, BNIM, Kansas City, one of
the world’s most respected green architects
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Design Phase: Optimised
Further reading:
– Integrated Design Process Guide, Alex
Zimmerman, CMHC
Who and what’s involved in:
The construction phase
• All hands involved in the planning,
directing, testing and assembly of the
building need to know the standard and
have clear written instructions.
• They must be able to explain the goals of
standard and must know why the standard
is important.
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Who and what’s involved in:
The construction phase
• Starts in the design phase with the
selection of the standard and the detailed
specifications for the assembly and
materials to be used.
• You must impress that quality will be
measured both in the ‘cost of quality’, will
be visually inspected and air tightness
tested.
On-Site Testing and Inspecting
Identifying and respecting the air barrier.
• Most standards have min. threshold of air
leakage in order to be certified.
• Everyone on the jobsite must be able to id
the air barrier, even at transitions.
• All should be able to draw it’s placement
on a cross section with a red pen.
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ID Air Barrier
Polyethylene air barrier
system (very cold climates
only—Zones 6 or higher)
Source:
www.buildingscience.com
ID Air Barrier
Housewrap air barrier
system
Source:
www.buildingscience.com
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ID Air Barrier
Exterior sheathing (insulated or
not) air barrier system
Source:
www.buildingscience.com
This is a blower door.
Love this guy/gal!
S/he can help you find the
leaks and be part of your
quality management team.
They see lots of different
things… and can be a source
of great information
Air Barrier
Testing
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Educate Crews
Often the best way to educate reluctant crews is to
break the message down into it’s barest elements.
>Like the following about ultra-efficient houses.
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Construction practices to avoid
• The following slides are a collection of
common issues in contemporary
construction.
• Most are dry walled over and will haunt the
homeowner.
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Check your foam for depth!
W H E R E D I D T H E F O A M FA I L ?
M a n y ‘ b l i s t e r s ’ ( p a i n t e d o r a n g e )
w e r e f o u n d t h r o u g h o u t t h e ½
p o u n d f o a m . W h e n p r e s u r i s e d
t h e y l e a k e d a l o t o f a i r. F o a m w a s
u n a t t a c h e d o r d e l a m i n a t e d .
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2LBS Spray foam
Cellulose Insulation
Soffit vent
Follow the air
barrier
Notes on Steel
• Steel has amazing strength, but not only
does it conduct heat amazingly well, it also
is really hard to detail insulation and air
barriers around it.
• It has been known to cause condensation
problems and discomfort.
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What steel looks like in Infrared..
http://www.rensolutions.co.uk/thermal_bridge.php
Ducts in Unconditioned Spaces
• Installing ductwork outside the envelope is
never a good design; avoid it.
• We get called back to “improve” these
design flaws.
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More exposed supply
side leakage means
hot humid attic,
depressed living
space, constantly
washed with fresh
outside dry air.
www.buildingscience.
com BSD-102:
Understanding Attic
Ventilation
C O N D E N S AT I O N E V E R Y W H E R E !
… f o r m i n g m i n i p o o l s o f
c o n d e n s a t i o n o n t o p o f
p o o r l y i n s u l a t e d E R V
i n l e t d u c t , s o m u c h
s o t h a t i t ’ s d r i p p i n g
d o w n . . .
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Skylights
This was a 17’
tall triangular
shaft, with a
20’x2’ opening in
the ceiling for a
2’x4’ skylight.
Condensation
and uncalculated
heatloss.
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Who’s
there first:
Electrician
or
insulator?
Air tightness
• Houses don’t need fresh air; occupants
do.
• Build tight; ventilate right.
• Ventilation is not something you let the
building shell take care of through
‘leakage’.
• Ventilation is something that needs to be
controlled precisely and actively.
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Which envelope is more airtight?
Ed Marion’s analogy…. www.passivehouseontario.ca
A tight envelope>
1. More durable: Has less moisture pumped
through the envelope.
2. Saves money: Less
3. More comfortable: Keeps humidity and
more even temperature throughout.
4. Less liability: We’ll show you pictures of
recalls that dogged designers and
contractors.
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Zen master says>
Moisture movement can
only be controlled by
stopping air flow*.
* And capillary action.
Control moisture by>
• Stop unwanted air flow and you stop
moisture from causing condensation that
leads to unhealthy mould and structural
rot.
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For optimum health a human
needs:
• Q: How many glasses of water per day?
– A: 8 glasses per day
• Q: How many m3 of fresh air per day?
– A: 10m3 per day* or ASHRAE 62**
recommends 611m3 per day.
*Assumes 7.5litres per human/minute to deplete air from 21% O2 in to 16% O2
out.
** Based on 15CFM per person or min 0.35 ACH.
Heat Recovery Ventilation
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Heat Recovery Ventilation
• Often, lose and leaky buildings have HRVs
in them and the intent for precise
ventilation is lost at a huge energy penalty.
• As the building shell gets more air tight,
the value of having an HRV increases.
Dedicated
returns to
HRV
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Conclusion
• Do it once, do it right;
• Select your team & standard carefully
• Optimise your house by energy simulation
• Get everyone on board early
• Calculate mistake cost as a % of sales.
• Test and inspect, especially with new
players.