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Basics & Theory

Architect Magazine: A Look Back at Insulation Products of the 20th Century
Architect Magazine chronicles material advances for structural insulating products through the 1900s.

Architect Magazine: Insulation Products For Energy Efficient Construction
Architect Magazine article describes new residential insulation products that meet high-performance challenges of todays building science details.

BCBEC: History Of Superinsulated Houses In North America
BC Building Envelope Council online slideshow by Martin Holladay from Green Building Advisor provides a chronological account of important developments in superinsulation techniques from 1972 to 1986. (PDF)

Fine Homebuilding: Buyers Guide to Insulation
Fine Homebuilding says if youre selecting insulation, you need to make sure that your chosen material is appropriate for its intended location, that it will perform well, that it wont be prohibitively difficult to install, and that it wont blow your budget.

Fine Homebuilding: U-factor Vs R-value
Fine Homebuilding magazine explains both U-Factor and R-value are measures of a material's insulating performance. The former is a measurement of heat transfer; the latter measures heat resistance. Understanding the difference will help you select energy-efficient windows and insulation.

GBA: History Of Insulation
Green Building Advisor article and podcast by Dr. John Straube talks about the history of insulation, how different materials work, and where they make sense.

GBA: Understanding R-Value
Green Building Advisor describes how R-value measures heat transfer by conduction, convection, and radiation.

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.

NAIMA: Fiber Glass & Rock Wool & Slag Wool Loose-Fill Insulation
North American Insulation Manufacturers Association tech sheet describes fiber glass and rock wool and slag wool loose-fill insulation. (PDF)

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

US DOE: Types Of Residential Insulation
US Department of Energy describes features, benefits, and considerations for various types of residential insulation.

Wikipedia: R-Value & U-Factor
Wikipedia describes R-value and U-factor.
Industry Information

HIRL: Insulation Choices Revealed in New Study
Home Innovation Research Labs says based on the Builder Practices Survey results, Fiberglass insulation remains solidly the most popular insulation material in new homes. Considering all areas of new single-family homes – floors, walls, and roofs – Fiberglass Batt insulation now comprises about 52 percent and Blown Fiberglass represents 19 percent of installations.

HIRL: Insulation Usage Patterns
US NAHB Home Innovation Research Labs says insulation usage patterns are linked to home type, pricepoint, geography, and builder size.

NAIMA Canada: Under-Insulated Houses in Existing Canadian Housing Stock
NAIMA Canada report reveals that by simply retrofitting homes with better insulation, Canadians could save hundreds per year on electricity bills and play a big role in reducing greenhouse gas emissions.
Industry Sectors

BCICA: BC Insulation Contractors Association
BC Insulation Contractors Association members work in residential, commercial, industrial and marine insulation. The association provides development of standards and procedures, member training, and professional networking.

Building Science: Thermal Metric Research Project Summary June 2015
Building Science provides an update on their Thermal Metric Research Project, undertaken with a consortium of insulation manufacturers, that is studying the thermal performance of building enclosures under realistic conditions. The consortium has undertaken a series of laboratory research projects to: advance the understanding and quantification of building enclosure thermal performance; support the development of a new thermal performance system or metric that credits high-performance assemblies (of all types of construction and insulation materials); support good design and construction practices. (PDF)
Information Sources

Building America: Online Guides For Insulating Walls & Components
Building America online guides describe considerations and procedures for insulating walls and wall components.

Building Science: Online Info Sheets On Thermal Control
Building Science online info sheets on thermal control describe background theory and recommended procedures for proper design and installation of insulation. Select from list Info-501, 502, 511, 512, or 513.

Building Science: Reports On High R-Value Wall Assemblies
Building Science provides free access to their technical documents on High R-Value Wall Assemblies, summaries of results of their ongoing High R-Value Enclosure research.

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.

Global Insulation: Resource Site On Insulation
Global Insulation site offers online resources including global insulation news, links to selected insulation sites, information on the Global Insulation Conference and insulation articles.

HGTV Remodels: Articles & Videos On Best Practices For Insulation
HGTV Remodels offers online articles and videos to help you learn about the best products and techniques for improving insulation quality and energy efficiency for your clients.

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.

JLC: Articles On Insulation
Journal Of Light Construction provides a number of free and paid industry articles on insulation products, problems, and procedures.

NAIMA: Technical Reports On Insulation
North American Insulation Manufacturers Association library has articles and reports on fibreglass, rock wool, and slag wool insulation products, problems, and procedures.

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: Resource Site On Insulation
US Department of Energy provides information and resources on insulation including types, materials, where to insulate, existing homes, new home construction, and radiant barriers.

US DOE: Where To Insulate In A Home
US Department Of Energy provides overview on where to insulate your home, including sections on attic, duct, cathedral ceiling, exterior wall, foundation, basement, crawlspace, slab-on-grade and insulating floors above unconditioned garages.
Issues & Performance

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)

BC Housing: Updated Building Envelope Thermal Bridging Guide
BC Housing online updated Building Envelope Thermal Bridging Guide looks at current obstacles and opportunities to improve building envelope thermal performance. Version 1.2 expands the thermal performance catalogue with additional data for many newly analyzed assemblies and details. This includes more cladding attachment systems, window interfaces, precast concrete interfaces, wood-frame and brick veneer walls, and other thermal mitigation systems. Version 1.3 adds 99 new details and 363 new scenarios that includes generic and proprietary details and assemblies.

BOABC: Attic Roof RSI Calculation
Building Officials Association of BC document describes how to determine the total RSI value for a roof assembly. (PDF)

BOABC: BC Code Interpretation On Combustible Foam Plastic On Exterior Walls
Building Officials Association of BC code interpretation on combustible components in exterior walls of sprinklered Part 3 buildings describes when foam plastic insulation can be used and when it must be protected (PDF)

BOABC: Exterior Framed Wall RSI Calculation
Building Officials Association of BC document describes how to determine the total RSI value for an exterior framed wall. (PDF)

BOABC: Thermal Bridging & Energy Standards
Building Officials Association of BC online slide show presentation Thermal Bridging and Energy Standards covers the Building Envelope Thermal Bridging Guide, and current energy codes and standards. (PDF)

BPI: Effective R-Values For Batt Insulation
Building Performance Institute describes how to calculate effective R-values of existing batt insulation. (PDF)

Builder Magazine: o You Know the R-Value of Your Wall?
Builder Magazine says whole-wall R values are often dramatically less than one might assume. Reducing thermal bridging with advanced wall assemblies can help to address this issue.

Building Science: Overview Of Thermal Metric Project
Building Science describes their Thermal Metric project that was initiated in 2007 to support good design and construction practices by improving the way thermal performance is measured. Ultimately, the project goal is to develop a metric that can capture the in-service thermal performance of whole assemblies. More accurate measurements will allow truly high-performance assemblies (of all types of construction and insulation materials) to be identified and promoted.

Building Science: R-Value Myth Busting
Building Science online slide show presentation describes issues and considerations around the difference between R-value of materials and those of walls. (PDF)

Building Science: Thermal Bridges & Solar Control
Building Science online slide show presentation on thermal bridges & solar control covers heat flow basics, walls & windows practical detailing applications, and window solar gain control. (PDF)

Building Science: Thermal Metric Summary Report
Building Science online Thermal Metric Summary Report describes a number of important and interesting observations that have come out of their reference wall tests. (PDF)

Building Science: Thermal Metrics For High Performance Walls & Limitations Of R-Value
Building Science research report says R-value metric is increasingly unable to measure or accurately compare actual thermal performance because system effects, sensitivity to construction defects, and airflow can play such a significant role in overall performance. It explores thermal performance of building opaque enclosures, and the need for a broader more holistic assessments than the R-value ratings of insulation products alone can provide.

Canadian Contractor: Defeating Thermal Bridging
Canadian Contractor says high R-value gains in walls are wasted when thermal bridges are overlooked.

ConstructConnect: Thermal Bridging Can Impact Energy Performance
ConstructConnect explains why not understanding membrane continuity, control of moisture at building interface joints and overall thermal performance can lead to a situation no one wants to face.

Construction Canada: Insulations Role In Controlling Noise
Construction Canada says the best strategy for optimizing acoustic comfort in dwelling units is to address all the possible sound transmission paths in the architectural details so they can be easily incorporated during construction.

CWC: Online Calculator for Effective R-Value of Walls
Canadian Wood Council online calculator for effective R-Value will provide designers with climate zone-appropriate insulated wall assembly solutions that are easily comparable with national and provincial energy efficiency prescriptive provisions.

EEFA: Guidance on Specifying Healthier Insulation
Energy Efficiency for All online report Guidance for Specifying Healthier Insulation and Air Sealing Materials provides information that can be used to evaluate and select healthier products and write project specifications that incorporate healthier insulation and air-sealing materials for energy efficiency upgrade projects in multifamily housing.(PDF)

Energy Vanguard: 4 Types Of R-Value
Energy Vanguard says if we use R-value to describe only the insulating properties of the insulation we install, we neglect the insulation value of the other layers in a building assembly. In a wall, those layers include drywall, sheathing, cladding, and air films. They add to total R-value.

Energy Vanguard: How To Grade Installation Quality Of Insulation
Energy Vanguard describes how home energy raters can put a grade on the installation quality of insulation, by recording each assembly as having a Grade I, Grade II, or Grade III quality.

Fine Homebuilding: Thermal Bridging Short Circuits Insulation
Fine Homebuilding interactive graphic illustrates how heat flows around insulation and through the framing members in a wall, roof, or floor.

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: Downside To Lumpy Attic Insulation
Green Building Advisor says if attic insulation isn't raked smooth, its performance will suffer.

GBA: Finding Insulation That Is Chemically Safe
Green Building Advisor describes how having chemical sensitivities complicates the search for the right insulation, and the right insulation contractor.

GBA: Green Seal Publishes New Insulation Standard
Green Building Advisor says Green Seal, a nonprofit certifier of green building products, has published a green standard for insulation, giving builders and homeowners the most comprehensive guide to date for choosing products with the lowest potential to damage human health and the environment.

GBA: Is R-Value Dead As A Dodo?
Green Building Advisor says the R-value of your insulation is just one number, and it’s not enough to tell you everything you need to know about your wall’s thermal performance.

GBA: What Is Thermal Bridging?
Green Building Advisor says to understand thermal bridging, you need to understand your home’s wall assembly and the various materials used in its construction.

GBA: What's The Definition Of An R-20 Wall?
Green Building Advisor describes why it's surprisingly tricky to determine what the code means by an R-20 wall.

Health Canada: Health Risks Of Asbestos
Health Canada describes the health risks of asbestos and how exposure can be dangerous to your health, as well as how to properly handle a potential asbestos problem. They provide sections on what is asbestos?, what are the health risks of exposure?, how can you be exposed to asbestos?, how do you reduce your risk of exposure?, how does the Government of Canada protect you from exposure?, and sources of more information.

II: Causes Of Insulation Slumping & Settling
Insulation Institute describes how improper installation can result in conditions which, over time, can allow slumping or settling of various insulation products.

II: Why Some Products Have Cancer Warning Label
Insulation Institute says today’s fiber glass and mineral wool insulation products do not need a cancer warning label. This industry conducted extensive research and testing to confirm that these products present no possible cancer hazard and that research and those tests were recognized by two important authoritative bodies – IARC and NTP.

JLC: Mice And Insulation
Journal of Light Construction says there's no easy way to keep mice from infesting house walls, but here are some reasonably effective strategies.

Morrison Hershfield: Real R-Value Of Exterior Insulated Wall Assemblies
Morrison Hershfield offers online paper wherein the authors have undertaken analyses, using the modeling program THERM, to numerically evaluate effective thermal resistance of some typical wall assemblies used in high-rise residential buildings. They evaluated impact of slab edge detailing and a variety of secondary structural elements needed to support cladding. They developed a method of presenting information in a manner that architects can practically use to determine actual insulation thicknesses required to obtain the overall walls desired thermal performance. Free registration required. (PDF)

NAIMA Canada: Insulation R-Value & Canadian Climate Zones
NAIMA Canada explains nominal and effective R-Values, and describes Canadian climate zones and heating degree days..

NRCan: Calculating Effective Thermal Resistance of Opaque Assemblies
NRCan provides thermal resistance properties of opaque assembly materials required to calculate the total effective thermal resistance of building assemblies under Energy Star for New Homes Standard. The format is designed to provide simple, easy-to-use look-up tables for the effective thermal resistance of portions of assemblies containing both framing members and cavity insulation, as well as continuous material layers (including air films).

Pro Trade Craft: Effective R-Value, From R-50 to R-12 Due to Studs
ProTradeCraft Podcast features a Senior Project Manager with RDH Building Science Laboratories breaking down the nuts, bolts, what, why and how of R-value, insulation, and building assemblies.

Remodeling TV: Common Thermal Bridging Problems
Remodeling TV online video describes where common thermal bridging problems occur and how to fix them.

US DOE: Standard Work Specifications for Insulation in Home Energy Upgrades
US Department of Energy online Standard Work Specifications for installing insulation in home energy upgrades cover attics, walls, floors, basements & crawlspaces, ducts, and more.

US EPA: Overview Of Asbestos-Contaminated Vermiculite Insulation
US Environmental Protection Agency describes vermiculite insulation, potential concerns related to asbestos, recommended steps to take, and sources of more information.

WorkSafe BC: Bulletin On Dangers Of Exposure To Asbestos In Vermiculite Attic Insulation
WorkSafe BC bulletin describes vermiculite insulation that may contain asbestos, problems caused, steps to prevent exposure, and sources of more information. (PDF)

BC Hydro: Insulating For Energy Efficiency
BC Hydro factsheet describes how to identify the most effective and energy-efficient way to insulate your home. (PDF)

Builder Magazine: Flash & Batt Technique For Wall Stud Cavities
Builder Magazine describes flash and batt technique for wall stud cavities. It combines more expensive but airtight closed-cell, expanding foam insulation and affordable fiberglass batts to create a thermally efficient and cost-effective envelope.

Building America: Installing Insulation To RESNET Grade 1 Standard
Building America online solution center describes how to install insulation to RESNET Grade 1 standard, including scope, description, ensuring success, climate, training, CAD, compliance, and more info.

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 : Hybrid Roof & Wall Insulation Assemblies
Building Science describes roof and wall assemblies that use insulation materials from various manufacturers who figure out ways to work with each other.

Building Science: Current State Of High R-Value Enclosures For Residential Buildings
Building Science report reviews and summarizes current state of understanding and research into enclosures with higher thermal resistance, so-called High-R Enclosures.

Building Science: Deep Energy Retrofits With Exterior Cladding`
Building Science online slide show presentation Deep Energy Retrofits: Exterior Cladding Research covers benefits of exterior insulation strategies, different methods and materials that can be used in exterior insulation applications, cladding attachment issues, and system limitations. (PDF)

Building Science: Exterior Wall Superinsulation Retrofit
Building Science online slide show presentation describes details and analysis for residential exterior wall superinsulation retrofit. (PDF)

Building Science: External Insulation Of Masonry & Wood Framed Walls
Building Science research report External Insulation of Masonry Walls and Wood Framed Walls developed baseline engineering analysis to support the installation of thick layers of exterior insulation (2” to 8”) on existing masonry walls and wood framed walls through the use of wood furring strips (fastened through the insulation back to the structure) as a cladding attachment location.

Building Science: High R Wall Systems For Deep Energy Reductions
Building Science slide presentation offers recommendations for using high R wall systems to accomplish deep energy reductions in housing. (PDF)

Building Science: High-R Walls Case Study Analysis
Building Science study considers a number of promising wall systems that can meet the requirement for better thermal control. Unlike previous studies, this one considers performance in a more realistic matter, including some true three-dimensional heat flow and the relative risk of moisture damage. (PDF)

Building Science: High-R Walls For Pacific Northwest
Building Science research report High-R Walls for the Pacific Northwest-A Hygrothermal Analysis of Various Exterior Wall Systems considers a number of promising wall systems that can meet the requirement for better thermal control. It considers performance in a realistic matter, including some two- and three-dimensional heat flow and analysis of the relative risk of moisture damage.

Building Science: Inside Or Out? Thermal Bridging & Insulation Location
Joe Lstiburek leads a discussion with John Straube and industry experts Achilles Karagiozis, Mac Sheldon and Gary Parsons, on whether or not all insulation should be on the outside.

Building Science: Installation Of Wall Cavity Insulation
Building Science describes installation techniques important to the effective performance of cavity insulation.

Building Science: Insulation & Thermal Bridges
Building Science online slide show presentation describes issues and considerations for insulation and thermal bridges. (PDF)

Building Science: Residential Exterior Wall Superinsulation Retrofit Details & Analysis
Building Science paper focuses on retrofitting very high insulation levels (i.e., superinsulation, or deep energy retrofits). Several cold-climate residential retrofit projects have been completed using an exterior insulation approach on light-frame above-grade walls. This type of retrofit is a reasonable step if a recladding of the building is already being done for aesthetic or ongoing maintenance reasons. The methods demonstrated here result in walls with insulation levels in the R-35 to R-40 range. (PDF)

Building Science: Thermal Control For Healthy, Durable, Low Energy Buildings
Building Science online slide show presentation describes features and considerations for thermal control for healthy, durable, low energy buildings. (PDF)

CI: Installing Exterior Insulation
Construction Instruction online video describes issues and considerations for installing exterior insulation over wall sheathing.

CI: Videos On Installing Insulation Products
Construction Instruction online animations show how to install some insulation products.

CPM: Choosing The Right Thermal Insulation
Canadian Property Management describes a range of criteria that needs to be considered when picking energy-efficient insulation.

Ecohome: How to Insulate Exterior Walls from Outside
Ecohome describes some ways to retro-fit exterior insulation to walls.

Energy Vanguard: 2 Ways to Get the Best Insulation in A Home
Energy Vanguard describes two ways to make sure you get the most out of your insulation.

Energy Vanguard: Great Tool For Checking Insulation In Walls
Energy Vanguard describes a great tool for checking existing insulation in walls. You can find this tool in the plumbing section of your local home improvement store, for about $2.50.

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: Hybrid Insulation Of Advanced Framed House
Fine Homebuilding online videos describe how they insulated an advanced framed house using three types of insulation, including rigid foam outsulation, Owens Corning Energy Complete, and open cell spray foam.

Fine Homebuilding: Online Video On Determining Amount Of Insulation In Wall
Fine Homebuilding online video describes how to determine what type of insulation is in your walls, and wall cavity depth, using a drill, a coat hanger, and an inconspicuous place for testing.

Fine Homebuilding: Plan Insulation Ahead Of Time To Save Energy
Fine Homebuilding describes how to build a house that performs at a high level, by planning your insulation strategy as part of the design process.

For Residential Pros: Achieving Attic Energy Efficiency
For Residential Pros describes three successful approaches to achieving a well-insulated attic.

GBA: Exterior Insulation With Thermal & Moisture Control Layers
Green Building Advisor describes some tips and tricks to choosing the continuous exterior insulation that fits the needs of the job.

GBA: Finding The Insulation Sweet Spot
Green Building Advisor discusses what the right amount of insulation is to put in a house.

GBA: Framing and Insulating an Interior Service Wall
Green Building Advisor describes how dense-packed fiberglass completes the insulation package on an interior service wall.

GBA: Insulating a New House
Green Building Advisor discusses the best way to insulate exterior walls in a new build in Ontario.

GBA: Overview Of Insulation
Green Building Advisor provides information and resources on insulation purposes, types, applications, and considerations for selecting the right product for your application.

GBA: Product Options For Insulating Stud Cavities In Existing Homes
Green Building Advisor describes five wall insulation options for existing homes including loose cellulose, dense-packed cellulose, loose blown-in fiberglass, dense-packed fiberglass, and injection foam.

GBA: Two Different Specs For Superinsulated House
Green Building Advisor describes how two experienced designers decided on their optimal wall designs, roof designs, insulation R-values, and window glazing. Is either system right for you? It depends on your climate, performance goals, and budget.

GBA: When There Are Too Many Insulation Options
Green Building Advisor discusses Howe a homeowner in Michigan sorts through the choices for a new house, weighing wall thickness as well as insulation type.

HIRL: Installation of Common Insulation Types
Home Innovation Research Labs online tech note Installation of Common Insulation Types: Wood-Frame Walls and Attics, provides practical information for the installation of three types of insulation in various applications: fiberglass, cellulose, and spray polyurethane foam. (PDF)

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: 3 Things You Should Ask Your Insulation Contractor
Insulation Institute says if the focus is on superior quality installation, builders should ask three questions of the insulation contractors who want to work for them.

II: 5 Most Common Insulation Install Flaws
Insulation Institute describes the top 5 areas where insulation flaws can compromise energy performance.

II: Do Quality Insulation Installations Cost More?
Insulation Institute discusses whether quality insulation installations should cost more.

II: Novel Approach to Insulating Vented Attic
Insulation Institute describes an attic insulation approach that applied a continuous layer of zip sheathing on top of the attic joists, with the seams sealed with tape. sheathing. No insulation in the ceiling cavity, as it was applied on top of the sheathing.

II: Old School Hack for Estimating Insulation Jobs
Insulation Institute talked with three building industry professionals about providing accurate estimates for batt and blown in insulation jobs and why it matters to get it right the first time.

Massachusetts Univ: Insulating On The Outside
University of Massachusetts describes how wrapping a home with insulating sheathing saves energy and can be cost effective, if the design considers a host of structural concerns including moisture, shear loads, insects and fire.

NAIMA: Key Checkpoints for Inspecting Insulation Jobs
North American Insulation Manufacturers Association bulletin Key Checkpoints for Inspecting Insulation Jobs helps you determine if insulation is properly installed in walls, ceilings and floors and provides guidance on air sealing, insulating around combustible sources and more. (PDF)

NAIMA: Overview Of Building Insulation Types & Applications
North American Insulation Manufacturers Association describes features, benefits, and applications for various types of building insulation.

NAIMA: Where & How To Insulate A Home
North American Insulation Manufacturers Association. shows where and how to insulate walls, attics, above ceilings with unheated spaces, basement walls, floors above vented crawl spaces, cathedral ceilings, floors over unheated garages or porches, knee walls, and in between interior walls (especially bathrooms), ceilings or floors.

NRC: Properties and Position of Materials in the Building Envelope
Canadian National Research Council online Report on Properties and Position of Materials in the Building Envelope for Housing and Small Buildings summarizes computer modelling of different wall systems in different Canadian climates incorporating outboard insulation of an R-4 or higher. The results found that for all of the configurations studied the outboard insulation reduced the risk of condensation by increasing the wood sheathing temperature. (PDF)

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)

RDH: Effective U-values & R-Values For Tapered Insulation
RDH Building Engineering bulletin presents theory and calculation methods used to develop tables of effective R-values for tapered insulation. (PDF)

Remodeling: Optimizing Home Insulation System During Remodel
Remodeling magazine describes how to assess the existing insulation and determine if updating it would improve the energy efficiency of a home.

US DOE: Insulation Guide for Contractors to Share With Homeowners
US Department of Energy online Best Practices Series: Volume 17 Insulation: A Guide for Contractors to Share With Homeowners will help contractors and homeowners identify ways to make their homes more comfortable, more energy efficient, and healthier to live in. It also identifies the steps to take, with the help of a qualified home performance contractor, to increase their homes insulation, ensure healthy levels of ventilation, and prevent moisture problems. (PDF)

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)
Product Supply

Architect Magazine: New Green Insulation Materials
Architect Magazine describes new insulation options offering recycled and renewable materials that make the selection and installation processes easier.

Builder Magazine: 7 Innovative Insulation Materials
Builder Magazine describes seven innovative insulation materials that are earth-friendly, help boost R-value, and seal your houses.

Fine Homebuilding: Online Payback Estimator For Insulation Upgrade
Fine Homebuilding online payback estimator for wall and ceiling insulation upgrade calculates how long it will take to payback your investment based on savings in energy costs.

Fine Homebuilding: Reconsidering R-Value Recommendations
Fine Homebuilding discusses whether the dropping cost of solar PV systems means that it's more economical to just install more PV panels and skimp on insulation.

GBA: Diminishing Returns Of Adding Insulation
Green Building Advisor describes considerations around the diminishing returns of adding more insulation.

GBA: Sometimes It's Cheaper to Install PV Than More Insulation
Green Building Advisor says before you decide to add more insulation to your attic, compare the cost of extra insulation with the cost of supplying necessary heating or cooling with solar electricity.

NAIMA: Canadian Financial Incentives For Insulation
Canadian division of North American Insulation Manufacturers Association provides searchable database of grants and rebates that are available from the federal and provincial governments, and local utilities across Canada.
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