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Basics & Theory

Architect Magazine: Overview Of Weather, Vapour, Air Barriers
Architect Magazine describes how weather, vapor, and air barriers protect buildings and their occupants, and when each should be used.

BC Hydro: Draftproof Your Home
BC Hydro Power Smart describes benefits and offers tips on procedures to draftproof your home to reduce heat loss and save on your energy consumption.

BCBEC: Canadian History of Airtightness in Buildings
BC Building Envelope Council online slide show presentation describes a history of airtightness in Canadian buildings. (PDF)

Building Science: Air Barriers vs. Vapor Barriers On Inside Of Buildings
Building Science principal Dr. Joe Lstiburek, in this article on air barriers vs. vapour barriers, challenges the use of polyethylene vapour barrier on the inside of buildings as the answer to all moisture problems.

Building Science: Double Play with Water Control & Air Control Layers
Building Science Corporation describes how the failure of either a water control layer or air control layer can lead to loss or severe damage to equipment or property.

Building Science: Forty Years Of Air Barriers
Building Science report Forty Years of Air Barriers-The Evolution of the Residential Air Barrier says throughout the postwar years practitioners were taught, incorrectly, that vapor barriers were necessary in cold climates to protect wall assemblies from moisture damage and that it was necessary to install these vapor barriers on the interior of cavity insulation.

CMHC: Air Permeance Of Building Materials
CMHC research brief includes a chart showing the average air leakage rate of common building materials. (PDF)

Energy Vanguard: Air Barriers, Vapor Barriers, Drainage Planes
Energy Vanguard describes air barriers, vapor barriers, and drainage planes and how they do different jobs.

Energy Vanguard: An Air Barrier Is NOT A Product
Energy Vanguard says there's no such thing as an air barrier product you can purchase. There are only air barrier systems that have to be assembled.

GBA: Comparison Of Air Barrier & Vapor Barrier
Green Building Advisor online podcast by Dr. Joe Lstiburek offers a simple comparison between air barriers and vapor barriers, and warns that we need to worry more about airtightness if we want to keep our homes healthy and dry.

GBA: How Air Affects A House & Importance Of Air Barriers
Green Building Advisor podcast by Dr. John Straube describes how natural and mechanical forces can pressurize a house many ways, and how air carries so much moisture, air barriers are important for indoor air quality as well as energy efficiency.

GBA: Questions & Answers About Air Barriers
Green Building Advisor covers some common questions about the often-perplexing topic of air barriers, which are mandatory in most homes, but often tough to install.

HEP: Super Stars of Energy Efficiency, Air Sealing & Insulation
Home Energy Pros online video shows why air sealing and insulation are the celebrities of the high-performance home world.

NRCan: Insulation & Air Barrier Materials
Natural Resources Canada online guide describes types and characteristics of insulation and air barrier materials.

Old House Web: Best Practices For Vapor Retarders & Air Barriers
Old House Web best practises for vapour retarders & air barriers in rehab work, lists different types, advantages, and disadvantages of each.

RDH: Real World Evaluation Of Vapor Permeable Air Barriers
RDH Building Science online slide show presentation Vapor Permeable Air Barriers: Real World Evaluation Of What Works, What Doesn't and Why looks at real world testing of various types of vapour permeable liquid and self-adhesive air barrier membrane products and identifies potential strengths and weakness of these types of products.

RDH: Why Building Airtightness is Important
RDH Building Science says the idea of air entering or exiting a building may not seem like cause for concern, but in reality, airtightness is an important aspect in building performance. Because the internal environments of buildings need to be carefully controlled to allow for proper ventilation, temperature and moisture control, these unintended leakages, usually invisible to the naked eye, can cause major issues that can be costly to both building owners and occupants.
Education & Training

NAIMA Canada: Free Online Course on Air Barriers for Professionals
NAIMA Canada offers the free online course Air Barriers for Professionals. It is practically oriented information for residential construction workers and renovators who deal with air tightness, insulation, and various control barriers to improve the energy efficiency of homes.
Industry Sectors

NABA: Canadian National Air Barrier Association
National Air Barrier Association, the trade association for the air barrier industry has membership of contractors, manufacturers, design professionals, testing agencies, consultants and utilities.
Information Sources

BRIK: Difficulties In Measurement Of Air Leakage
BRIK paper Air Leakage: Difficulties in Measurement, Quantification, and Energy Simulation examines difficulties of measuring air leakage through building enclosures on components, assemblies, systems, and whole-buildings. The authors discuss commonly specified air leakage criteria and testing requirements from a practical standpoint based on both theoretical and field testing experience. (PDF)

Building America: References & Resources On Air Sealing
Building America online Solution Center provides references and resources on air sealing.

Building Science: Online Info Sheets On Air Barriers
Building Science online info sheets on air barriers describe background theory and recommended procedures for proper design and installation. Select from list Info-401, 405, 406, 407, or 408

CI: Air & Moisture Control
Construction Instruction online videos and articles describe products and procedures for air and moisture control including water management, air tightness testing, air sealing, and air & weather barriers.

Concordia Univ: Links To Resources On Air Barriers
Concordia University building envelope database offers links to articles, reasearch, and related references on air barriers.

Energy Star: Air Sealing & Insulation Of Homes
Energy Star describes how to seal air leaks throughout a home to stop drafts, add insulation to block heat loss in winter and heat gain in summer, and choose Energy Star qualified windows when replacing windows.

Insulate & Air Seal: Canadian Industry Resource Site on Insulation & Air Sealing
Insulate and Airseal is hub for individuals and companies to access and share the latest information and education on professional insulation and airsealing.

IRC: Air Barriers For Building Envelopes
Canadian Institute for Research in Construction papers from their Building Science Insight '86 seminars include The Air Barrier Defined, Wind & Air Pressures on the Building Envelope, Air Leakage Control, and Air Barrier Systems: Construction Applications. (PDF)

US DOE: Air Sealing A Home
Department of Energy site provides information and resources on air sealing, including new home construction, detecting leaks, caulking, and weatherstripping.

US DOE: Insulation & Air Sealing Products & Services
US Department of Energy Use provides links to get product information and locate professional services for insulation and air sealing.

US DOE: Online Guides To Air Sealing Walls/Openings
US Department of Energy online guides provide information on products and procedures for air sealing walls/openings.

YouTube: Online Videos On Air-Sealing A House
Online videos at You Tube describe where and how to air seal different parts of a house.
Issues & Performance

Adhesives: Air Leakage Testing/Standards
Adhesives article describes air barrier codes and standards that have been created, along with related specific test methods.

APA: Air Permeability of Wood Structural Panels as Air Barriers
Engineered Wood Association technical bulletin Air Permeability of Wood Structural Panels as Air Barriers addresses questions regarding the performance of wood structural panels in air barrier systems. Free site registration required.

BC Housing: Airtightness Targets in Codes & Standards Across BC
BC Housing online appendix to the Illustrated Guide for Achieving Airtight Buildings is a handy reference and overview of whole-building airtightness performance targets in codes and standards across BC. (PDF)

BC Housing: BC Best Practices For Air Sealing & Insulation Retrofits
BC Housing online BC Standards of Practice Guide for Air Sealing and Insulation Retrofit describes procedures and considerations for attics & roofs, below grade walls and basements, crawlspaces, exposed floors, and above grade walls. (PDF)

BCBEC: Air Tightness in City of Vancouver
BC Building Envelope Council online slide show presentation describes air tightness requirements in the City of Vancouver. (PDF)

Building Green: Testing Flashing & Air Barrier Seam Tapes
Building Green describes how they tested the service life of flashing and air barrier seam tapes.

Building Scence: Field Testing Of Compartmentalization For Multifamily
Building Scence study Field Testing of Compartmentalization Methods for Multifamily Construction examined the use of the taping of exterior sheathing details to improve air sealing results in townhouse and multifamily construction. The results show no improvement associated with such taping. (PDF)

Building Science: Examples Of Failures In Air Barrier Applications
Building Science Seminar presentation shows examples of failures in air barriers in some different types of buildings. (PDF)

GBA: Greater Air Leakage After Spray Foam
Green Building Advisor says three blower door tests, performed over time, revealed increasing air leakage. Could it be a moisture-related phenomenon?

GBA: Results Of Backyard Air-Sealing Tape Test
Green Building Advisor describes results of 11 air-sealing tapes tested by attaching samples to six different substrates mounted on the exterior wall, and exposed to sunlight and wind-driven rain for 10 months.

NAHB: Building Air Tightness, Code Compliance & Air Sealing Overview
US National Association of Home Builders technical note Building Air Tightness: Code Compliance & Air Sealing Overview describes issues and considerations for the degree of air leakage into and out of the building's thermal enclosure. (PDF)

ACCA Now: How to Air Seal an Attic Floor
ACCA Now describes how to air seal an attic floor.

ACCA Now:: How to Air Seal an Attic Right & Tight, Part 2
ACCA Now covers a few of the less common problem building assemblies that can be found in and around attics that also need to be air sealed to provide homeowners with a complete and comprehensive solution to their comfort issues.

Adhesives: Air Barrier Applications For Sealants & Adhesives
Adhesives describes how sealants and adhesives used to air seal the gaps and joints in air barriers.

APA: T210 Simple Air Sealing with OSB & Plywood Sheathing
Engineered Wood Association bulletin Simple Air Sealing with OSB and Plywood Sheathing says plywood and OSB sheathing of 3/8 category or thicker are both code-recognized air barrier materials. They detail 10 common sources of air infiltration that should be checked and sealed during construction. Free site registration required.

Architect Magazine: Flash & Batt For Air-Sealing & Insulation
Architect Magazine describes how spray-on sealants and flash-and-batt systems combine to reduce air infiltration and make insulation more effective.

BC Housing: Illustrated Guide On Achieving Airtight Buildings
BC Housing online Illustrated Guide, Achieving Airtight Buildings is an industry resource to design, build and test airtight buildings. It also consolidates information on achieving airtightness in buildings, with a focus on larger or more complex building types while ensuring building enclosure performance, including moisture management, thermal performance and durability. (PDF)

BC Housing: Online Video On Building Smart With Air & Vapour Barriers
BC Housing online video of their workshop Building Smart with Air and Vapour Barriers covers building science principles, design considerations and practical installation details related to the use of air and vapour barriers in single and multi-unit residential buildings. Speakers examine the challenges and options for improving the durability, safety, comfort and energy efficiency of buildings through the effective use of barrier materials.

BC Housing: Wall Air Barrier Reference Sheet
BC Housing provides an overview of the steps that can be taken to make the commonly used wall sheathing membrane airtight as part of an overall effort to achieve the whole-building airtightness level as required by the City of Vancouver or the BC Energy Step Code. (PDF)

BCBEC: Building & Testing Airtight Buildings
BC Building Envelope Council online seminar slide show presentation describes impacts and lessons learned from building and testing airtight buildings. (PDF)

BRIK: Impact Of Residential Energy Conservation Measures On Airtightness
BRIK online slide show presentation summarizes the study Impact Of Various Residential Energy Conservation Measures On Airtightness, that quantified the impacts of various residential energy conservation measures on the airtightness of retrofitted Canadian houses. It confirmed that prairie houses tend to be tighter than those in more temperate regions, partial story houses are generally leakier than full story houses, and older houses experience more air leakage than newer houses. It confirmed that all of the energy conservation retrofits affected airtightness, whether through deliberate attempts to seal potential leakage sites or inadvertently as the result of other actions such as blowing insulation into wall cavities. (PDF)

Builder Magazine: 5 Penetrations With Most Bang For Your Air-Sealing Buck
Builder magazine says based on studies in a research lab and a test house, the top five areas in a home that will provide the biggest return on air-sealing investment are: recessed lights; duct boot; top plate to drywall at attic; garage wall; band joists.

Building Performance Community: Insulation & Air Sealing Challenges
Building Performance Community online video on insulation and air sealing challenges explains why it's hard for trade contractors to meet performance requirements and ensure quality installations.

Building Science: Air Barriers For Commercial Buildings
Building Science online slide show presentation by Dr. John Straube describes rationale and approaches for air barriers in commercial buildings. (PDF)

Building Science: Air Flow Control
Building Science Seminar presentation by Dr. John Straube covers why control air flow, driving forces, air barrier systems, airflow within enclosures, air leakage condensation, and tall buildings. (PDF)

Building Science: Air Leakage As Next Frontier Of Building Science
Building Science online slide show presentation describes issues and considerations around air leakage as the next frontier of building science. (PDF)

Building Science: Air Sealing & Compartmentalizing Townhouses & Row Houses
Building Science article Air Sealing and Compartmentalizing Townhouses and Row Houses describes why it's not easy to separate townhouses and row houses from one another, and from garages, and of course from the outside.

Building Science: Air Sealing Using Air Tight Drywall Approach
Building Science describes, with detailed drawings, how and where to air seal different parts of a house using the air tight drywall (ADA) approach.

Building Science: Airflow Control, Air Barriers & Energy
Building Science online slide show presentation on airflow control covers energy & R-value, airflow control vs air barriers, airflow & energy, and metrics & measurement. (PDF)

Building Science: Airtightness Testing In Large Buildings
Building Science digest Airtightness Testing in Large Buildings reviews why one would invest in airtightness testing for a large building, how the testing is done, how the results are interpreted, and how this information can be used.

Building Science: Are We Sealing The Right Walls In Buildings?
Building Science Corporation says everyone is running around sealing the outside of buildings and the term “air barrier” has gone from obscurity to buzz word in less than a decade. But if you look at the physics we are sealing the wrong walls. We should be air sealing the interior demising walls and isolating floors from one another if we really want to improve the building performance of multi-story buildings.

Building Science: Attic Air Sealing Guide & Details
Building Science online Attic Air Sealing Guide & Details provides background and approach for prep work necessary prior to adding attic insulation. It focuses on combustion safety, ventilation for indoor air quality, and attic ventilation for durability. The details section provides a scope of work and specification for the air sealing of many points of air leakage in common attic spaces.

Building Science: Discussion On Air Sealing & Ventilation
Building Science Corporation says air sealing in retrofits should always be thought through carefully. Industry experts discuss where the best place to air seal is, and whether or not homeowners understand the relationship between air sealing and ventilation.

Building Science: How Air Leaks Waste Energy & Rot Houses
Building Science article from Fine Homebuilding describes how uncontrolled airflow through the shell not only carries moisture into framing cavities, causing mold and rot, but it also can account for a huge portion of a home's energy use and can cause indoor-air-quality problems. (PDF)

Building Science: How to Look at a House like a Building Scientist Pt 1, Air
Building Science describes how to use diagnostic tools to find air leaks that make homes inefficient, uncomfortable, and are often the cause of moisture-related problems.

Building Science: Sealing Air Barrier Penetrations
Building Science describes why and where most air barrier systems require supplemental air sealing to seal around penetrations.

Building Science: Sealing Rim Joists With Spray Foam
Building Science says rim joist, band joist, or any area that connects building components, are particularly problematic to air seal properly. They describe the critical seal method that addresses condensation and air barrier details quickly and easily using spray urethane foam insulation applied to relevant surfaces, connecting them as an air barrier.

Building Science: Understanding Air Barriers
Building Science digest describes how controlling airflow will control the interactions among the physical elements of the building, its occupants and the environment. It outlines the key strategies in the control of airflow using air barriers.

Canadian Contractor: Air Sealing is King
Canadian Contractor says building durability and indoor air quality requires increased focus on air leakage.

Canadian Contractor: Understanding Continuous Air Barrier Systems
Canadian Contractor says as codes across the country begin to mandate higher levels of energy efficiency, the direct implication are building envelopes that must become tighter in terms of air changes per hour (ACH). In order to reduce the tightness of the envelope, every building envelope needs an effective air barrier system.

Chimney Balloon: Smoke Pencils For Finding Air Leakage Sites
Chimney Balloons blog has information on smoke pencil types, features, and use for searching out air leagage sites.

CI: CI Live Online, Air Tightness Roundtable
Construction Instruction online video features their air tightness roundtable discussions and presentations.

CMHC: Air Leakage Control For Existing Multi Family Buildings
CMHC online manual describes air sealing measures to reduce air leakage, reduce building energy consumption, improve indoor air quality and occupant comfort in multi family buildings. Air sealing products and measures are detailed for common air leakage points. 2007 (PDF)

CMHC: Air Sealing Tune Up Of High-Rise Residential Building Envelope
CMHC online guide Air Sealing Tune Up Of High-Rise Multi-Unit Residential Building Envelope covers sealing the bottom of the building, top of the building, outside wall & openings, vertical shafts, and compartmentalization of service areas. (PDF)

CMHC: Guidelines For Delivering Effective Air Barriers
CMHC guideline presents a methodology to help designers and installers deliver an air barrier system that meets requirements and recommendations of the National Building Code of Canada and any specifications particular to that project. It covers common design and installation flaws, and a protocol for inspection and testing of the system as it is being installed. (PDF)

CMHC: Where Polyethylene Is Appropriate As Air & Vapour Barrier
CMHC research illustrates where polyethylene is appropriate for air/vapour barriers and where other vapour barrier materials might be preferable. It identifies situations in which performance could be improved, and provides information on general approaches to help mitigate performance concerns. (PDF)

Energy Star: DIY Guide To Sealing Air Leaks
Energy Star online do it yourself guide, with pictures, covers locating air leaks, getting started, sealing attic air leaks, additional sources of rir leaks, sealing basement air leaks, and adding attic insulation. (PDF)

Energy Star: Guide To Thermal Bypass Checklist
Energy Star online guide describes thermal bypasses in a home, and offers tips and resources for air sealing them. (PDF)

Energy Star: Planning Attic Air Sealing Project
Energy Star describes issues, considerations, materials and procedures for air sealing an attic.

Energy Star: Thermal Bypass Inspection Checklist
Energy Star Thermal Bypass Inspection Checklist must be completed for homes to earn the ENERGY STAR label. The Checklist requires visual inspection of framing areas where air barriers are commonly missed and inspection of insulation to ensure proper alignment with air barriers, thus serving as an extra check that the air and thermal barriers are continuous and complete. (PDF)

Energy Vanguard: Don't Caulk Windows First When Winterizing Your Home
Energy Vanguard says don't caulk windows first when winterizing your home because it is likely to be ineffective. Two reasons are the big holes are in the floor and ceiling, and the big pressure differences are at the top and bottom of the house.

FBC: Best Practices for Air Sealing & Insulation in Homes
Fraser Basin Council online video features Graham Finch from RDH Building Science discussing best practices and mistakes to watch out for in real examples of air sealing and insulation.

Fine Homebuilding: Air Barriers Are Essential for Modern, High-Performance Home
Fine Homebuilding says controlling air movement through the walls and ceilings is a key step toward comfort, energy efficiency, and building durability.

Fine Homebuilding: Air Leakage At Bulkhead Doors & Windows
Fine Homebuilding online video describes ways to tighten up air leaks at the bulkhead door and windows.

Fine Homebuilding: Air Sealing & Insulating Existing Attics
Fine Homebuilding describes a comprehensive approach to attacking insulation and moisture problems, by examining procedures, special equipment, and materials to weatherize an old house. (PDF)

Fine Homebuilding: Air Sealing A Basement
Fine Homebuilding describes five places to check for air leaks in your basement and some advice on how best to seal them.

Fine Homebuilding: Air Sealing Windows & Doors
Fine Homebuilding online video describes how to use a low-pressure, low-expansion, closed-cell foam designed for windows and doors, and to apply it with a pro-style foam gun.

Fine Homebuilding: Blower-Door-Assisted Air Sealing
Fine Homebuilding describes how a blower door can be used to assist you in air sealing a home.

Fine Homebuilding: Handy Hose for Air Sealing With Spray Foam
Fine Homebuilding online video describes a simple, handy hose for air sealing with spray foam.

Fine Homebuilding: How to Hang Airtight Drywall
Fine Homebuilding online video shows how air tight drywall can make your house more energy-efficient when installed with caulks, sealants, canned foam, and gaskets.

GBA: Air Barriers Difficult In Origami-Inspired Homes
Green Building Advisor says when designers create sprawling houses with multiple bump-outs, it's difficult for builders to create an uninterrupted air barrier.

GBA: Air Leakage Degrades Thermal Performance Of Walls
Green Building Advisor describes how testing by the Building Science Corporation begins to quantify the problem of air leakage degrading the thermal performance of walls.

GBA: Air Leaks Waste Energy & Rot Houses
Green Building Advisor article describes how leaks through holes in your house can cause moisture and indoor air quality problems, and waste energy. Also covered are air leakage via wind, stack effect, and fans, as well as moisture issues.

GBA: Air Seal Major Thermal Bypasses First
Green Building Advisor describes why you should not worry about the cracks around your windows until you've sealed all of the big holes in your house.

GBA: Air Sealing and Insulation
Green Building Advisor describes how to air seal leaks in the air barrier, conduct a blower door test, and install cellulose insulation.

GBA: Air Sealing Penetrations
Green Building Advisor says detailing the penetrations for exterior receptacles, a wood stove flue, and plumbing vents requires careful planning.

GBA: Air Sealing With Sprayable Caulk
Green Building Advisor says homes insulated with fiberglass batts are leakier than homes insulated with cellulose or spray polyurethane foam. Owens Corning EnergyComplete and Knauf EcoSeal are two sprayable products that aim to help batts perform the way they're supposed to.

GBA: Air-Sealing Products & Materials
Green Building Advisor online video describes common sealants, plus a few uncommon options, for sealing up holes big and small.

GBA: Canned Spray Foam Tip
Green Building Advisor describes how misting water before using canned spray foam can make a significant difference, and can double the yield from a can of spray foam.

GBA: Details For Thermal Bypass Checklist
Green Building Advisor offers 50 online detail drawings that solve the problems listed in the Energy Star Thermal Bypass Checklist. Membership required.

GBA: Getting Biggest Bang For Your Air-Sealing Buck
Green Building Advisor describes which cracks you should air seal first if you don't have time to seal every last crack.

GBA: Introduction To Air Sealing An Attic
Green Building Advisor online video identifies common air leaks and shows you the best materials and methods for sealing them up right.

GBA: Pinpointing Air Leaks With Fog Machine
Green Building Advisor describes how to use house pressurization and a fog machine to find air leakage pathways in a building.

GBA: Straightforward Air Sealing Strategies
Green Building Advisor says to follow these simple steps to get ready for code-required blower door testing and you'll probably do better than the code requires.

GBA: Tapes & Gaskets For Air-Sealing
Green Building Advisor describes the best tapes, caulks, or gaskets for most weatherization and air-sealing jobs.

GBA: Top 10 Air Leaks In Existing Homes
Green Building Advisor describes the ten most likely suspects for air leaks on existing homes. Access part 2 of the report from the link at bottom of part 1.

GBA: What Is More Important, Air-Sealing Or Insulation?
Green Building Advisor discusses how to best use a limited construction budget on a new house.

HRRP: Best Practices For Air Sealing & Insulation Retrofits
BC Home Renovation Rebate Program online video presentation by RDH Building Science describes results of their field inspections, and the best practices for air sealing and insulation retrofits.

II: 10 Hidden Air Leaks in New Homes
Insulation Institute online guide 10 Hidden Air Leaks in New Homes covers the most common areas where these holes occur and offers solutions to fix the holes during the construction process. (PDF)

II: 12 Air Leakage Areas of Focus for High Performance Walls
Insulation Institute says getting high performance walls relies on proper air sealing before installing insulation, regardless of the insulation used. This can't be done without understanding where homes typically leak air to prevent and/or address the top air sealing trouble spots.

II: 5 Priority Air Sealing Locations for New Homes
Insulation Institute online video walks through a custom home under construction and shows how to properly address strategic areas to help reduce the air leakage rate.

II: Air Sealing, Whose Job Is It Anyway?
Insulation Institute says there is an average of 22 subcontractors involved in the construction of a new home. With dozens of people involved, there can be a lot of confusion about whose job air sealing is, particularly if details aren't spelled out within the scope of work or aren't communicated effectively.

IIEBC: Issues During Installation of Air & Weather-Resistive Barriers
International Institute of Building Enclosure Consultants says there can be multiple issues associated with the installation of air and weather-resistive barriers, or the subsequent installation of exterior cladding/finishes applied over the top of the WRB that can affect the overall performance of the WRB/air barrier and the entire wall assembly.

JLC: Air Sealing At Foundations & Bottom Plate
Journal of Light Construction describes several methods and products to air seal between the bottom plate and concrete foundation.

JLC: Air Sealing Attics In Existing Homes
Journal Light Construction describes how to air seal attics in existing homes by locating heat loss with a blower door and an infrared camera. (PDF) Free Registration Required

JLC: Air Sealing That Works
Journal of Light Construction says an extremely tight shell proves affordable with universal, repeatable details.

JLC: Air Sealing The Story-and-a-Half Attic
Journal Light Construction article on air sealing a story-and-a-half attic describes how to include effective air barriers in the framing process.

JLC: Air-Sealing Options: Good, Better, Best
Journal of Light Construction says new standards for air-sealing require a range of new materials and methods.

JLC: Air-Sealing Techniques From Passive House Pro
Journal of Light Construction Even describes some advanced air-sealing methods.

JLC: Airtight Drywall and Air Sealing: Part One
Journal of Light Construction online video is the first part of a two-part series. Drywall expert Myron Ferguson shows how to create a continuous air barrier in the home by sealing all cavities before putting up drywall. He demonstrates everything from sealing plate gaps to outlets to ceilings.

JLC: Airtight Drywall and Air Sealing: Part Two
Journal of Light Construction online video is the second part of a two-part series. Drywall expert Myron Ferguson reveals his trick for sealing air leaks in canned lighting and finishes his continuous air barrier in the wall by installing insulation and putting up the drywall.

JLC: Common Air Leaks
Journal of Light Construction says just about any part of the building envelope will leak if given the chance, but the places where leaks are most likely to occur are low and high on a building.

JLC: Practical Air Sealing
Journal of Light Construction describes how to get maximum air leakage reduction by focusing on these locations.

LG Arch: Raising The Barrier for Air Tight Ceiling
LG Squared describes an interesting approach to ceiling air barriers using continuous mineral wool insulation on the exterior, loose fill stone wool in the attic and a unique application for zip sheathing.

Morrison Hershfield: Key to Your Building's Success in Passing Air Leakage Test
Morrison Hershfield says standards and codes across North America are becoming more stringent with regards to accepted air leakage rates in completed construction. As a result, air leakage testing is increasingly becoming a code requirement.

Morrison Hershfield: Plan & Prep Your Building Air Leakage Test
Morrison Hershfield describes the importance of thinking through the air leakage testing process early in project design.

NAIMA: Five Priority Air Sealing Locations
North American Insulation Manufacturers Association online guide, Five Priority Air Sealing Locations for New Homes, will help builders develop a smarter plan of attack for air sealing. Research shows the five locations identified within the guide are the most critical due to their potential to reduce air leakage.

NRCan: Air Leakage Control In Existing Homes
Natural Resources Canada guide on air leakage control in existing houses covers benefits, finding and sealing air leaks, ventilation considerations, combustion safety, and more. (PDF)

NRCan: Air Sealing & Insulating Roofs & Attics
Natural Resources Canada online guide Keeping The Heat In describes how to air seal and insulate easily accessible attics, houses with half storeys, cramped attics, cathedral ceilings and flat roofs, as well as dealing with ice dams, and renovations and repair.

NRCan: Keeping The Heat In
Natural Resources Canada online guide Keeping The Heat In describes basic principles of building science and provides guidance in home retrofit projects such as insulation and air sealing improvements. (PDF)

NRCan: Residential Air Leakage Control
Natural Resources Canada guide on air leakage control for home renovations covers basics of air-leakage control, finding leakage areas, caulking and other air-sealing materials, and moisture problems. (PDF)

ORNL: New Fluorescent Air Leak Detection System
Oak Ridge National Laboratory has developed a novel, nontoxic fluorescent air leak detection system that can find cracks in walls and roofs in existing and new buildings.

ORNL: Online Tool Calculates Energy Loss From Air Leakage
Oak Ridge National Laboratory online tool can help builders calculate energy loss when air leaks through a buildings envelope. Starting with specific building metrics, the calculator analyzes multizone airflow and ventilation and then determines the associated energy loss through a whole building energy simulation tool.

PNL: Modeling Air Infiltration Through Door Openings On Commercial Buildings
US Pacific Northwest National Laboratory report Energy Saving Impact of ASHRAE 90.1 Vestibule Requirements: Modeling Air Infiltration Through Door Openings On Commercial Buildings presents a methodology for modeling air infiltration through door openings. (PDF)

RDH: Airtightness Testing & Results For Part 3 Buildings
RDH Building Engineering report Airtightness Testing & Results For Part 3 Buildings shows a large number of factors impact in-service air leakage rates, and that a single value for infiltration likely will not address the complexity of estimating infiltration and exfiltration in large buildings. (PDF)

RDH: Early Testing Is A Key to Airtightness
RDH Building Science says one of the keys to good and accurate airtightness test results is scheduling testing as early as possible.

US DOE: Air Barrier For Dropped Ceiling/Soffit Below Unconditioned Attic
US Department of Energy describes how to install a continuous rigid air barrier or other supporting material to cap dropped ceilings or soffits.

US DOE: Air Seal Top Plates
US Department of Energy describes how to correctly air seal a wall with missing top plates or open wall cavities.

US DOE: Air Sealing Around Window & Door Rough Openings
Building America online video describes how to air seal around window and door rough openings.

US DOE: Air Sealing Duct & Flue Shafts
Building America Solution Center describes how to air seal around duct shafts and flues installed through ceilings, walls, and flooring to keep conditioned air from leaking into unconditioned space.

US DOE: Air Sealing Sill Plates
US Department of Energy describes hoe to air seal above-grade sill plates adjacent to conditioned space to minimize air leakage.

US DOE: Guide To Air Sealing An Existing Home
US Department of Energy online guide identifies steps to take, with the help of a qualified home performance contractor, to seal unwanted air leaks while ensuring healthy levels of ventilation and avoiding sources of indoor air pollution. Contractors can use this document to explain the value of these air sealing measures to their customers. The references in this document provide further explanation of air sealing techniques and technologies. (PDF)

US DOE: Guide To Attic Air Sealing
US Department of Energy online Measure Guideline: Guide to Attic Air Sealing provides information and recommendations for the preparation work necessary prior to adding attic insulation. (PDF)

US DOE: Guideline For Air Sealing Attics In Multifamily Buildings
US Department of Energy Measure Guideline: Air Sealing Attics in Multifamily Buildings, is intended for building owners, builders, contractors, homeowners, and other stakeholders in the multifamily industry. It explains why air sealing is desirable, explores related health and safety issues, and identifies common air leakage points in multifamily building attics. In addition, it also gives an overview of materials and techniques typically used to perform air sealing work. The guide focuses mainly on challenges found in existing buildings for a variety of building types, from low-rise wood-frame multifamily to mid and high-rise masonry apartment buildings. (PDF)

US DOE: Insulating & Air Sealing Existing Non-ICAT Recessed Lights
US Department of Energy describes how to air seal non-insulation contact (IC) rated recessed can lights by covering the can light with a protective covering to prevent conditioned air from escaping into the attic and to keep insulation from touching the recessed can light.

US DOE: Wall Air Sealing & Insulation Methods In Existing Homes
US Department of Energy Measure Guideline: Wall Air Sealing and Insulation Methods in Existing Homes provides renovators and retrofit contractors an overview of considerations when including wall air sealing and insulation in an energy retrofit project. (PDF)

WBDG: Air Flow Problems & Design Of Air Barrier Systems
Whole Building Design Guide article on air barrier systems, with drawings, focuses on large buildings, but is relevant to houses also. It covers air infiltration & exfiltration, problems, air pressures, and design suggestions.

WoodWorks: Integrated Air & Water Barrier Systems
WoodWorks online course presentation Integrated Air & Water Barrier Systems provides guidance for architects, specifiers, waterproofing contractors, and other professionals considering use and advantages in the selection or specification of air and water barriers for the design and installation of integrated structural panel and air and water barrier systems. Topics covered include an introduction to air and water barriers, structural panels, code requirements when designing for energy code compliance, and common design and installation practices and techniques. (PDF)
Product Supply

GBA: Is Air Sealing Mostly BS?
Green Building Advisor says if you consider economics alone, air sealing is a hard sell. But energy-efficiency is only part of the picture.

GBA: Using Sound To Measure Airtightness
Green Building Advisor describes how SonicLQ speaker projects low-frequency sound from the interior to the exterior enclosure. The sound makes its way through leakage sites to be both quantified and located by the microphone array. The array sends received acoustic data wirelessly to the tablet for processing and expression of results.
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