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Basics & Theory

BPF: Specifier Briefing On EPS In Construction
British Plastics Federation Expanded Polystyrene Groups online EPS Specifiers Briefing covers: Why specify EPS - Attributes and applications; What is EPS made of - Production and composition; How does EPS perform - Standards and performance; What are EPS sustainability credentials. (PDF)

BSC: Guide To Exterior Insulation Sheathing
Building Science Corporation guide covers exterior foam insulating sheathing including detailing for the management of water, vapor, and energy transfer are paramount.

CARB: Guide To Open-Cell vs Closed-Cell Foam
Consortium for Advanced Residential Buildings online guide describes performance benefits and potential performance limitations of open-cell and closed-cell spray polyurethane foam. (PDF)

CUFCA: Colour Chart For 2lb. Medium Density Sprayed Polyurethane Foam
Canadian Urethane Foam Contractors Association colour chart for 2lb. medium density sprayed polyurethane foam provides a visual reference of all the approved colours of these products to identify what product is being installed in a building. (PDF)

CUFCA: Overview Of Spray Polyurethane Foam Insulation
Canadian Urethane Foam Contractors Association provides information on spray polyurethane foam insulation including features, foam facts, residential, commercial, industrial, and FAQ's.

EcoHome Magazine: Overview Of Spray Foam Insulation
EcoHome Magazine describes what to look for in spray foam insulation to crank up the performance of your homes.

Fine Homebuilding: Soy Oil Foam Insulation
Fine Homebuilding online video describes soy oil foam insulation and difference between open-cell and closed-cell spray-foam insulations.

GBA: Closed-Cell Foam Beats Open-Cell Foam
Green Building Advisor article by Neal Ganser says closed-cell foam beats open-cell foam as it accomplishes all of the requirements for long-term sustainability of the building envelope, has a higher R-value, and is less vapor-permeable than open cell foam.

GBA: Exterior Insulation Is Like A Sweater For Your House
Green Building Advisor describes how a layer of rigid foam will keep your wall sheathing warm and dry.

GBA: Open-Cell Foam Beats Closed-Cell Foam
Green Building Advisor article by Jim Coler says open-cell foam beats closed-cell foam for above-grade residential applications because it is breathable, less expensive, and greener.

GBA: Overview Of Flash & Batt Insulation
Green Building Advisor describes flash and batt insulation, and it's advantages and disadvantages.

GBA: Rigid Boardstock Insulation
Green Building Advisor provides a brief overview of rigid boardstock insulation.

Icynene: Glossary Of Terms For Foam Insulation
Icynene alphabetical glossary gives brief descriptions of common terms for blown-in and foam insulation.

SPFA: Glossary Of Terms For Spray Foam
Spray Polyurethane Foam Alliance online glossary describes terms used in the spray foam industry.

SprayFoam: Difference Between 1/2-lb & 2-lb Spray Polyurethane Foam
SprayFoam article describes the two main types of spray foam insulation: 1/2-pound open-cell & 2-pound closed-cell, and suggests how a contractor can know which to use. (PDF)
Industry Sectors

CUFCA: Canadian Urethane Foam Contractors Association
Canadian Urethane Foam Contractors Association promotes the use of spray polyurethane foam (SPF) insulation, and administers the SPF Quality Assurance Program.

FSC: Foam Sheathing Coalition
Foam Sheathing Coalition serves as a manufacturing driven organization focused on developing solutions to building code issues and promoting the proper technical use of foam sheathing to the construction industry.

SPFA: Spray Polyurethane Foam Alliance
Spray Polyurethane Foam Alliance is the voice, along with the educational and technical resource, for the spray polyurethane foam industry.
Information Sources

CUFCA: Technical Documents & Resources On Sprayed Polyurethane Foam
Canadian Urethane Foam Contractors Association publishes a number of technical documents to assist design professionals and building owners on a wide variety of issues related to the use of sprayed polyurethane foam in buildings.

EPS: Technical Information On Expanded Polystyrene Foam Insulation
EPS Industry Alliance provides technical information on expanded polystyrene (EPS) foam insulation including physical properties, R-values, compressive strength, moisture resistance, fire resistance, insect infestation and sound transmission.

FSC: Resource Site On Foam Sheathing
Foam Sheathing Committee (FSC) of the American Chemistry Council provides information and resources on foam sheathing materials, applications, and procedures.

SPFA: Resource Site On Spray Polyurethane Foam
Spray Polyurethane Foam Alliance offers information and resources including what spray foam is, applications, case studies, energy & environment, health & safety, FAQs, technical information, and more.
Issues & Performance

American Chemistry: Health & Safety Of Spray Polyurethane Foam
Spray Polyurethane Foam Health & Safety site of the American Chemistry Council Center for the Polyurethanes Industry provides information about spray polyurethane foam insulation for the spray polyurethane foam professional.

Building Green: EPA Takes Action On Spray-Foam Health Risks
Building Green says the US Environmental Protection Agency has released a new action plan for chemicals used in spray polyurethane foam (SPF) insulation. The action plan leaves open questions about how far EPA will go to clamp down on these products, but it’s safe to think of this as a shot across the bow from EPA for the SPF industry.

Building Green: Insulation To Keep Warm, Not Warm The Planet
Building Green describes issues around the global warming potential of insulation materials.

Building Green: Making Healthier, Greener Foam Insulation
Building Green describes how a proposed change to the residential building code (International Residential Code) would eliminate the need for halogenated flame retardants in many applications.

Building Science: Exterior Insulation Analysis At Vancouver Field Exposure Facility
Building Science report Vancouver Field Exposure Facility: Phase III Exterior Insulation Analysis report compares the moisture related performance of an exterior insulated wall to the performance of two other common construction methods, side-by-side. There were no measured or observed moisture related durability concerns of the wood structural sheathing when 1.5" of exterior insulation was installed. (PDF)

Building Science: Moisture Durability With Vapor Permeabe Insulating Sheathing
Building Science says uncertainty exists on the effects of inward driven moisture and the interaction of increased sheathing temperatures on the moisture durability of the edifice when using exterior sheathing insulation. (PDF)

Building Science: Movement Of Cladding Installed Over Exterior Rigid Insulation
Building Science report Initial and Long Term Movement of Cladding Installed Over Exterior Rigid Insulation covers impacts of different fastener types in the system capacity, impact of screw shaft bearing on the insulation material, impacts of material expansion and contraction on the pre and post compression forces in the assemblies, and if deflection movement for heavier weight claddings can be mitigated by denser fastener spacing. (PDF)

Building Science: Temperature Dependence Of R-values In Polyisocyanurate Roof Insulation
Building Science Corporation has found significant thermal performance differences between different manufacturers of polyisocyanurate insulation products and significant differences based on in-service temperature.

Buildings: Published R-values Not Consistent With In-Service Performance
Buildings article by National Roofing Contractors Association says it does not consider the use of long-term thermal resistance to be appropriate for design and in-service purposes. NRCA's longstanding position is that the published R-values for polyisocyanurate and polyurethane foams are not consistent with actual in-service performances of these products.

CMHC: Issues With Urea-Formaldehyde Foam Insulation (UFFI)
CMHC fact sheet describes urea-formaldehyde foam insulation, potential problems, and what to know if buying or selling a house that has UFFI installed. (PDF)

CUFCA: Building Code Considerations & References For Spray Foam
Canadian Urethane Foam Contractors Association provides information on building code considerations and references for spray foam insulation applications.

CUFCA: Spray Polyurethane Foam Meets Code Requirement For Vapour Barrier
Canadian Urethane Foam Contractors Association research demonstrated ability of typical framed walls using spray polyurethane foam insulation, with and without additional vapor barrier layers, to meet National Building Code of Canada requirements. (PDF)

Energy Vanguard: Calculating Global Warming Impact of Insulation
Energy Vanguard says in general, all insulation types can help mitigate the effects of climate change. Types with the bad blowing agents, however, have limits to their effectiveness.

Energy Vanguard: Does Spray Foam Need Thermal Or Ignition Barrier?
Energy Vanguard says requirements for thermal and ignition barriers for spray foam insulation are one area where there's a lot of confusion.

Energy Vanguard: Foam Insulation, Global Warming Potential, And BS
Energy Vanguard says he has seen this bad information about closed cell spray foam and XPS foam board come up many times in the last six years.

Energy Vanguard: Foam Insulation, Payback, Global Warming
Energy Vanguard says when we look just at energy savings and global warming impact, XPS and ccSPF aren't as bad as it first seemed.

Energy Vanguard: High Humidity In Open Cell Spray Foam Attic
Energy Vanguard says that we need to start thinking of open cell spray foam installations differently. The days are over when you can spray open cell foam in an attic, close it up, and walk away. We know now that this can cause problems.

Energy Vanguard: New Perspective On Foam Insulation & Global Warming
Energy Vanguard provides an update to previous comments he made on the global warming impact of insulation.

Energy Vanguard: Will Open-Cell Spray Foam Insulation Really Rot Your Roof?
Energy Vanguard says some homes with open-cell spray foam have had moisture problems, but many more have performed perfectly well.

Fine Homebuilding: Closed-Cell Foam Between Studs Is a Waste
Fine Homebuilding says what really matters is the R-value of the whole wall, not just that of the insulation.

Fine Homebuilding: Spray Foam Durability
Fine Homebuilding Q & A says current generation spray-polyurethane foams make cured foam very chemically inert and stable, suggesting they will last much longer and retain their flexibility and mechanical integrity more reliably.

GBA: Avoiding Global Warming Impact of Insulation
Green Building Advisor says new data from Environmental Building News shows that the high global warming potential of certain foam insulation materials counteracts a lot of the environmental benefit of high insulation levels.

GBA: Can Exterior Foam Insulation Cause Mold & Moisture Problems
Green Building Advisor discusses whether rigid foam insulation on the outside of a house will trap moisture, causing mold and decay.

GBA: Coping With Termites & Carpenter Ants In Rigid Foam Insulation
Green Building Advisor discusses whether rigid foam insulation aids and abets destructive insects such as termites and carpenter ants.

GBA: Health Concerns When Using Spray Foam In Retrofits
Green Building Advisor says protecting workers during and occupants after retrofits involving spray foam insulation installation is essential.

GBA: Home Fires Linked To Spray Foam Installation
Green Building Advisor says some home fires have been linked to spray foam installation.

GBA: If Ants Like Rigid Foam Should We Stop Using It?
Green Building Advisor says rigid foam insulation is routinely used in high-performance buildings, but it also seems to attract carpenter ants.

GBA: Installing Spray Foam In Cold Climates
Green Building Advisor says before spraying can begin, an insulation contractor must verify that the substrate is warm and dry. If spray foam is installed on a cold, damp surface, the foam won't adhere properly.

GBA: Out Gasing Of Spray Foam Insulation
Green Building Advisor discussion forum offers information and resources regarding the out gassing of spray foam insulation.

GBA: Spray Foam Jobs With Lingering Odor Problems
Green Building Advisor says smelly spray foam is rare, but when the problem occurs, everyone gets a headache.

GBA: Thermal Barriers & Ignition Barriers For Spray Foam
Green Building Advisor says US building codes usually require spray foam insulation to be protected with a layer of drywall or a comparable barrier for fire safety, but not always.

IRC: Effect Of Air & Vapor Permeance Of Exterior Insulation On Flow Of Moisture
Canadian Institute for Research in Construction study Effect of the air and vapor permeance of exterior insulation on the flow of moisture in wood frame walls in a cold climate. (PDF)

IRC: Energy Rating Of Polyurethane Spray Foam Walls
Canadian Institute for Research in Construction describes a research project to assess the thermal and air leakage characteristics of spray polyurethane foam walls as well as conventional wall assemblies. (PDF)

IRC: Exterior Insulation & Moisture Accumulation In Retrofit Of Exterior Walls
Canadian Institute for Research in Construction studied the effect of adding different exterior thermal insulation materials on the hygrothermal response of wood-frame walls in a cold climate. It showed that the air and vapour permeance of the exterior insulation materials not only affected the flow of moisture to the outside during wintertime periods of air exfiltration but also affected moisture inwards flow during humid early summer conditions. (PDF)

IRC: Long Term Thermal Resistance Of Closed Cell Foam Insulation
Canadian Institute for Research in Construction paper provides a comprehensive scientific outline of research activities that have been carried out at NRC-IRC on the aging of closed-cell foam insulation and its practical implications on the North American construction industry. (PDF)

JLC: Drywalling Over Interior Foam Insulation On Crawlspace Walls
Journal of Light Construction forum discusses how to finish a conditioned crawlspace when the local authority is requiring drywall over foam, and the practical way to install the rock in a crawlspace that is only a few feet high.

JLC: How Safe Is Spray-Foam Insulation
Journal of Light Construction Q & A discusses whether polyurethane spray-foam insulation has any risk for the installer and the homeowner, and are if there are alternatives.

Pure Energy: Fire Barriers For Rigid Or Spray Foam Products
Pure Energy describes how some plastic foams, both rigid and spray, require being covered by an ignition or thermal barrier after installation, and others do not. (PDF)

RDH: Thermal Bridging From Cladding Attachment Strategies Through Exterior Insulation
RDH Building Engineering paper Thermal Bridging From Cladding Attachment Strategies Through Exterior Insulation presents results of three dimensional thermal modeling which quantifies actual impact of thermal bridging in typical exterior insulated wall assemblies. (PDF)

US DOE: Retrofitting Residential Envelopes Without Creating Moisture Issues
US Department of Energy report Retrofitting Residential Envelopes Without Creating Moisture Issues researched whether exterior retrofit of frame assemblies can be risky when impermeable insulating sheathings of relatively low thermal resistance are used. It found that there is virtually no moisture durability risk to the sheathing when water is drained repeatedly in the drainage gap between the exterior insulation and the sheathing membrane, provided there are no other moisture-related issues unrelated to the drainage cavity such as air leakage condensation, or bulk rain water leakage. (PDF)

US DOE: Wind Pressure Performance For Wall Systems With Exterior Insulating Sheathing
US Department of Energy report High-R Walls for New Construction Structural Performance: Wind Pressure Testing is focused primarily on laboratory testing that evaluates wind pressure performance characteristics for wall systems constructed with exterior insulating sheathing. It will help to facilitate the ongoing use of non-structural sheathing options and provide a more in-depth understanding of how wall system layers perform in response to high wind perturbations normal to the surface. (PDF)
Procedures

BCBEC: Field Monitoring Of Continuously Insulated Wall Assemblies In Multi-Story Residential
BC Building Envelope Council online slide show presentation describes results of structural and hygrothermal field monitoring of thick continuously insulated wall assemblies utilized in a multi-story residential building in Vancouver. (PDF)

BCBEC: NBC Code Tool for Above Grade Walls
BC Building Envelope Council online slide show presentation describes the NBC code tool for above grade walls. (PDF)

BOABC: Sprayed Polyurethane Foam In Construction
Building Officials Association of BC online slide show presentation Sprayed Polyurethane Foam in Construction covers types of foams, comparison between open-cell and closed cell, standards for the foam industry, building code commentary, CUFCA and the quality assurance program, and resources for code officials. (PDF)

BPP: Where, How, Why Of Spray Foam Insulation
Building Performance Podcast discusses the chemistry, the hype, the conspiracy theories, the right way, and the wrong ways to use spray foam insulation.

Building Green: 7 Tips For Getting Injection & Spray Foam Right
Building Green says quality installation of the two types of site-manufactured foam insulation is no easier than fiberglass batt and no less important, and describes how to avoid the most common problems.

Building Science: Exterior Spray Foam
Building Science describes why and how spray polyurethane foam (SPF), the high-density stuff, is the only product (so far) that can perform all of the functions of the principal control layers of the perfect wall including water control, air control, vapor control, and thermal control.

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: Guidance On Taped Insulating Sheathing Drainage Planes
Building Science report Guidance on Taped Insulating Sheathing Drainage Planes recommends solutions that provide durable and long-term water management using exterior insulating sheathing as part of the water management system. It is possible to tape or seal the joints in insulating sheathing to create a drainage plane and even an air control layer. There exists the material durability component of the tape as well as the system durability component being the taped insulating sheathing as the drainage plane.

Building Science: Incorporating Thick Layers Of Exterior Rigid Insulation On Walls
Building Science online Measure Guideline: Incorporating Thick Layers of Exterior Rigid Insulation on Walls provides information on design and construction of wall assemblies that are using thick layers of rigid exterior insulation (in excess of 1.5 inches) that require a secondary cladding attachment location exterior of the insulation to be provided. (PDF)

Building Science: Insulating Sheathing For Building Enclosure
Building Science paper examines methods of incorporating insulating sheathing into the thermal and moisture management systems of the building enclosure in a variety of climate zones across North America. (PDF)

Building Science: Online Presentation On Continuous Foam Insulation
Building Science online webinar presentation Continuous Insulation addresses relevant building science principles, materials & methods of construction, practical insights and useful resources related to the appropriate integration of foam sheathing (continuous insulation) onto wall assemblies for code compliance and durable performance. (PDF)

Building Science: Spray Polyurethane Foam For Building Enclosures
Building Science online slide show presentation Spray Polyurethane Foam for Building Enclosures describes design and installation considerations for various types of wall systems and applications.

Building Science:Are You Doing Something Stupid With Spray Foam
Building Science describes three sprayfoam topics that might have you rethinking your decisions.

CCHRC: Manual On REMOTE Exterior Insulation System
Alaska Cold Climate Housing Research Centre online manual describes the REMOTE Wall System (Residential Exterior Membrane Outside insulation TEchnique) that provides a superior alternative that integrates standard frame construction with high insulation values and moisture control. (PDF)

Construction Instruction: 2-Inch Exterior Insulation with Structural Rainscreen
Construction Instruction online animation shows steps to installing 2-inch exterior insulation with structural rainscreen.

Energy Vanguard: Vivid Demonstration Of Benefit Of Exterior Insulation
Energy Vanguard shows that when you put insulation on the exterior of a building, you get two big benefits: Continuous insulation and warmer sheathing.

Fine Homebuilding: Cutting Rigid Insulation
Fine Homebuilding online video shows that teamed up with a straightedge, a sharpened putty knife cuts through rigid foam insulation like butter.

Fine Homebuilding: Encapsulating Framing In Spray Foam
Fine Homebuilding says it is not a problem to fully encapsulate framing members with high-density closed cell foam, regardless of your climate.

Fine Homebuilding: Options For Shear Bracing Foam-Sheathed Walls
Fine Homebuilding describes five ways to brace a foam-sheathed wall to prevent racking.

Fine Homebuilding: Thermal & Moisture Control Layers
Fine Homebuilding describes some tips and tricks for choosing continuous exterior insulation that fits the needs of the job.

GBA: Calculating Minimum Thickness Of Rigid Foam Sheathing
Green Building Advisor provides simple sizing guidelines for exterior rigid foam insulating sheathing.

GBA: Fastening Furring Strips To Foam-Sheathed Wall
Green Building Advisor describes how should you attach strapping when building a house with foam sheathing, and your siding is installed over vertical rainscreen strapping installed on top of the foam.

GBA: Getting Spray Foam Right
Green Building Advisor says spray polyurethane foam is an incredible material when applied correctly, but in the wrong hands it can be finicky.

GBA: How To Attach A Thick Layer Of Exterior Insulation
Green Building Advisor discusses whether or not extra-long screws will sag over time, if used on thick exterior insulation.

GBA: How To Install Rigid Foam Insulation Outside A House
Green Building Advisor online video shows how to install rigid foam sheathing to the outside a house.

GBA: How To Install Rigid Foam Sheathing
Green Building Advisor describes what you need to know to install polyisocyanurate, XPS, or EPS on the outside of your walls.

GBA: How To Insulate An Existing Wall From Outside
Green Building Advisor says the right combination of cavity insulation and rigid foam will ease worries about condensation.

GBA: Installing Spray Foam On Exterior Walls Of Existing House
Green Building Advisor describes a deep energy retrofit of an old house done by furring out the walls and applying spray foam to the exterior.

GBA: PERSIST Technique Puts Insulation On Outside
Green Building Advisor describes the PERSIST (Pressure-Equalized Rain-Screen Insulated Structure Technique) system that puts insulation on the outside.

GBA: Rigid Insulation Rehabs
Green Building Advisor discusses what type, where, and how much rigid insulation should be used to retrofit exterior above-grade walls and roofs.

GBA: Spray Foam Insulation Is Not A Cure-All
Green Building Advisor says poor installation can negate the benefits of spray foam insulation.

GBA: The Case For Continuous Exterior Foam Insulation
Green Building Advisor says building codes now recognize the increasing use of exterior rigid foam insulation.

GBA: Video On Installing Exterior Rigid Foam Sheathing
Green Building Advisor describes things to think about when planning to use exterior foam insulation as well as offering a video on superinsulating a home with rigid foam.

GBA: When Spray Foam Installation Goes Bad
Green Building Advisor says when spray foam is not installed correctly, it can get expensive for the client, the contractor, and the planet.

GBA: You Can Add Foam To The Interior In A Renovation
Green Building Advisor discussion suggests that it is possible to install rigid foam on an interior wall during a renovation, if care is taken to properly address potential moisture issues.

Home Innovation: 2X4 Walls With 1-1.5" Exterior Insulative Sheathing
US Home Innovation Research labs Construction Guide: Next Generation High Perfromance Walls addresses walls constructed with 2x4 wood frame studs, wood structural panel sheathing (WSP) as wall bracing and added backing for foam sheathing, a layer of rigid foam sheathing insulation up to 1.5 inches thick over the WSP, and a cladding system installed over the foam sheathing. It is applicable to low-rise residential buildings up to three stories in height, in Climate Zones 3-5. (PDF)

JLC Forums: Should Stud Bays Be Full Of Spray Foam
Journal of Light Construction forum discusses whether voids are permissible in an open-cell spray-foam application, spray-insulation quality control, and other pros and cons.

JLC: Best Practices For Continuous Exterior Insulation
Journal of Light Construction online guide describes how to select and install rigid foam on walls.

JLC: It Is Safe To Retrofit Exterior Foam Insulation
Journal of Light Construction Q & A says you may safely install exterior foam on most houses with a polyethylene vapor barrier, as long as the foam does not include aluminum-foil facing.

JLC: Retrofitting Exterior Insulation
Journal; of Light Construcion describes how to add rigid foam insulation to the outside of the building shell to dramatically increase R-value while reducing thermal conduction.

US DOE: Cladding Attachment Over Exterior Insulation
US Department of Energy Expert Meetings report US DOE: Cladding Attachment Over Exterior Insulation summarizes discussions on issues surrounding cladding attachment and performance of walls with exterior insulating sheathing. Topics were split into the two categories of gravity load resistance and wind load resistance. They explored these topics from the perspectives of engineering design, laboratory testing, field monitoring, and practical construction. (PDF)

US DOE: Cladding Attachment Over Thick Exterior Insulating Sheathing
US Department of Energy report Cladding Attachment Over Thick Exterior Insulating Sheathing is intended to help develop a better understanding of the system mechanics involved and the potential for environmental exposure induced movement between the furring strip and the framing. (PDF)

US DOE: Continuous Rigid Insulation Sheathing/Siding
Building America Solution Center describes features, benefits, procedures and considerations for installing continuous rigid insulation sheathing/siding.

US DOE: External Insulation of Masonry Walls & Wood Framed Walls
US Department of Energy online report External Insulation of Masonry Walls & Wood Framed Walls describes baseline engineering analysis to support the installation of thick layers of exterior insulation (2 in. to 8 in.) on existing masonry walls and wood framed walls. Wood furring strips (fastened through the insulation back to the structure) were used as a cladding attachment location. Water management details necessary to connect the exterior insulated wall assemblies to roofs, balconies, decks, and windows were created as guidance for integrating exterior insulation strategies with other enclosure elements. (PDF)

US DOE: Guidance On Taped Insulating Sheathing Drainage Planes
US Department of Energy online Measure Guideline: Guidance on Taped Insulating Sheathing Drainage Planes describes how to provide durable and long-term water management solutions using exterior insulating sheathing as part of the water management system. (PDF)

US DOE: Taped Insulating Sheathing Drainage Planes
Building America Solution Center describes how to install taped insulating sheathing to serve as the drainage plane for the wall system, and integrate all wall system flashing with the insulating sheathing drainage plane.
Product Supply

CUFCA: Comparison Of Physical Properties Of 2lb. Medium Density Closed Cell Foam
Canadian Urethane Foam Contractors Association chart provides a comparison of physical properties of 2lb. medium density closed cell foam products. (PDF)

CUFCA: List Of Spray Polyurethane Foam Manufacturers
Canadian Urethane Foam Contractors Association provides a list of their members who manufacture sprayed polyurethane foam insulation.
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