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Basics & Theory

Century Roof Tiles: House Diagram Showing Roof Parts
Century Roof Tiles, a California roofing company, provides a labelled house diagram showing all parts of the roof.

GAF: Glossary Of Terms For Roof Building Industry
GAF, a US manufacturer provides glossary of roof building terms.

IIBEC: History of Roofing
International Institute of Building Enclosure Consultants online slide show presentation History of Roofing covers roofing and shelter, early roofing, beginning of present day roofing, and roofing today. (PDF)

NRCA: Homeowner Guide To Buying New Roof
US National Roofing Contractors Association site explains the main types of residential roofing systems, plus it has pictures with more detailed info on each type, as well as advantages and disadvantages.

RCABC: Consumers Roofing Guide For BC
Roofing Contractors Association of BC offers online guide with detailed information on roofing systems, to assist consumers with selection of roofing services in BC.

Woodworks: Guide To Panelized Roof Systems
Woodworks online slide show describes what makes a panelized roof system so cost effective, how to decide which panelized roof system best suits your building, the basic structural, fire protection, and construction aspects of design, and other advantages to the panelized roof system. (PDF)
Education & Training

NRCA: Online Courses On Roofing
National Roofing Contractors Association online NRCA University offers courses including Asphalt Shingle Installation, Thermoplastic Roof Membrane Installation, Low-slope Onboarding for Roof System Installers AND Steep-slope Onboarding for Roof System Installers.

RCABC: Links To Training & Educational Courses
Roofing Contractors Association of BC offers roofing information and training courses for different people in our industry. From trade certification to general technical information they are a great industry resource.
Industry Information

NRCA: Annual International Roofing Expo
US National Roofing Contractors Association annual International Roofing Expo is a conference and trade show for the roofing industry.

Roof Tech: Annual Canadian Roofing Industry Conference & Trade Show
Canadian Roofing Contractors Association annual Roof Tech conference and trade show provides industry with product displays and educational opportunities for architects, building inspectors, contractors, engineers, property managers, roofing consultants and specifiers.
Industry Sectors

RCABC: Roofing Contractors Association of British Columbia
Roofing Contractors Association of BC members include roofing contractors, manufacturers and suppliers who serve commercial, industrial, institutional, and residential sectors.

US DOE: Research Into Next Generation Attics and Roof Systems
US Department of Energy describes their current research project Next Generation Attics and Roof Systems. The goal is to reduce space conditioning due to attics, and convince industry to adopt designs. (PDF)
Information Sources

ARMA: Technical Bulletins On Asphalt Roofing
Asphalt Roofing Manufacturers Association online technical bulletins offer information on common maintenance, repair, installation and weather-related topics affecting both residential and commercial asphalt roofs.

BD&C: Articles On Roof Design & Construction
Building Design & Construction magazine offers a collection of articles, courses, and tips for roof construction and repair.

CI: Roofing Products & Installation
Construction Instruction online videos and documents provide information on roofing products and installation considerations.

Fine Homebuilding: Articles & Resources On Roofs
Fine Homebuilding offers articles and resources for building durable, energy-efficient, and attractive roofs. Access to some articles requires site membership.

Fine Homebuilding: Roofing Resources`
Fine Homebuilding articles cover how to choose the right materials and get the construction details right to install a durable, weathertight roof on any home. Access to some articles requires site membership.

IIBEC: Past Seminar Presentations
International Institutes of Building Enclosure Consultants, Western Canada Chapter, provides online slide show presentations from some of their past technical seminars, covering various topics on roofing systems and issues.

NACHI: Roof Systems & Inspection Resources
International Association of Certified Home Inspectors online resources on Mastering Roof Inspections cover information on systems and inspection of the five major steep-slope roof-covering materials, including: asphalt composition shingles; metal roofs; wood roofs; tile roofs; and slate roofs. In addition to covering defects from manufacturing, installation, and natural weathering, the articles also cover the accurate identification of wind and hail damage.

NRCA: Technical Resources & Bulletins On Roofing
National Roofing Contractors Association offers technical resources on roofing & flashings, including their Roofing and Waterproofing Manual, construction details, technical search, building codes & standards, technical bulletins and special reports, low-slope & steep-slope, conferences and symposia, and technical publications.

SmartBrief: US General Contractor Ezine
SmartBrief, a free newsletter for general and specialty contractors, covering business topics, industry news and resources.

Traditional Roofing Magazine: Resource Site On Roofing
Traditional Roofing Magazine provides articles, information and resources on many different types of roofing.

Woodworks: Resource Site On Panelized Roof Systems
Woodworks provides information, case studies, and resources on panelized roof systems.
Issues & Performance

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.

APA: Designing Roofs To Prevent Moisture Infiltration
Engineered Wood Association offers free online booklet that has descriptions and drawings of each type of roof, along with proper design guidelines. Free registration required. (PDF)

BC Housing: Attic Ventilation & Moisture Research Study
BC Housing online Attic Ventilation and Moisture Research Study report presents the findings of a two-phase research project that looked at the presence of moisture and mold growth on the roof sheathing of ventilated attics constructed in coastal climates. Phase 1 examined and confirmed through field testing and monitoring that in some maritime climates mold growth may occur even in well ventilated attics. Phase 2 of the study focused on evaluating the factors that lead to moisture collection and mold growth in order to identify design solutions and treatments that would minimize the potential for mold growth. (PDF)

BC Housing: Roof Sheathing Surface Treatments for Mould
BC Housing report Field Evaluation of Roof Sheathing Surface Treatments outlines the methodology and findings from field evaluation of the efficacy of several surface-applied mould resistant treatments for the underside of roof sheathing. (PDF)

BSC: Energy & Moisture in Sealed & Insulated Attics
Building Science Corporation online slide show presentation describes issues and considerations for energy and moisture in sealed and insulated attics. (PDF)

Buiding Science: Guide To Attic Air Sealing & Roof Ventilation
Building Science says attics should be air sealed prior to adding insulation. Adding insulation alone does not save much energy and can lead to durability problems. This guide provides information for the air sealing and roof ventilation prep work necessary prior to adding attic insulation. (PDF)

Building America: Wind Washing Issues & Considerations
Building America Solution Center describes issues and considerations for dealing with wind washing, such as areas where wind is flowing through attic soffit vents and into adjacent second-story floor cavities, under or against attic kneewalls, or through cracks along top plates to pull heat from conditioned space or introduce unconditioned air into conditioned space.

Building Scence: Complex Three Dimensional Airflow Networks In Roofs
Building Science describes how sloping roofs can get you air convection cells, and worse. It turns out to be important to have multiple layers of rigid insulation with the joints offset horizontally and vertically (staggered) and to have an air barrier directly on the structural deck.

Building Science: Causes & Solutions To Ice Dams
Building Science digest says the combination of sufficient roof pitch, adequate insulation just above the exterior wall, and air sealing at the wall-roof assemblies transition are all essential to prevent ice dams. But ice dams can occur even in properly detailed roof assemblies from differential solar snow melt. This digest outlines both the causes and solutions to ice dam problems.

Building Science: Controlling Ice Dams
Building Science describes strategies to control ice dams by keeping the roof deck below freezing when the outside temperature is below freezing.

Building Science: De-Icing Ice Dams
Building Science Corporation says the key to solving ice dams is either to keep heat from the house from getting to the underside of the roof deck or to get rid of the heat once it gets there.

Building Science: Energy & Moisture in Sealed and Insulated Attics
Building Science online slide show presentation describes energy and moisture issues and considerations sealed and insulated attics. (PDF)

Building Science: Fixing The Lid
Building Science online slide show presentation describes considerations and solutions for energy efficient roof retrofits. (PDF)

Building Science: Research Into Ridge Rot In Unvented Roofs
Building Science online slide show presentation describes moisture issues and considerations for unvented roofs. (PDF)

Building Science: Roof Failures May Be Due To Lack Of Air Barriers
Building Science article predicts many uplifting moments in the future unless air barriers become common, to say nothing of the problems of fluttering membranes and light colored roofs.

Canadian Contractor: Roof Code Changes That Could Save Costs
Canadian Contractor says when it comes to roofs, the Code needs to be more prescriptive.

CI: How Roof Ice Dam Forms
Construction Instruction online animations shows how a roof ice dam is caused.

CIB: Tenets of Reliable Roofing
RCI says the International Council for Research and Innovation in Building and Construction recently issued CIB Report No. 405 titled Improving Roof Reliability. Based on reviews of published reports, advisory papers, and experience of its members, they recommended these 12 tenets of reliable roofing.

CleanTechnica: Green Roofs Are Cost-Effective Means Of Preventing Sewer Overflows
CleanTechnica says green roofs retain water and thus prevent said water from simply flowing into the sewers.

CMHC: Removing Ice On Roofs
CMHC describes techniques to deal with roof icing and ice dam problems. (PDF)

CMHC: Study Of Attic Ventilation & Moisture
CMHC research found that too much or too little attic ventilation will increase moisture levels in attic wood members. The field work showed that stack effects usually determined the rate of infiltration of moist house air into the attic but that the attic ventilation rates were more dependent upon wind conditions. (PDF)

CMHC: Survey Of Moisture Levels In Attics
CMHC research project was designed to discoversome of the following attic characteristics: ventilation area (designed and actual); air change rate; air leakage between the house and attic; and seasonal moisture levels in the attic lumber and sheathing. (PDF)

CRCA: Purchasable Canadian Roofing Reference Manual, CRCA Specification Manual & Preventa\ve Maintenance Manual
Canadian Roofing Contractors Association offers three purchasable manuals for industry use. The CRCA Roofing Specification Manual provides product specifications. $150 CDN. The Canadian Roofing Reference Manual is a ready reference for use on the jobsite. $70 CDN. The Roofing Preventative Maintenance Manual provides information about maintaining a roof to obtain the highest level of performance throughout its useful life. $25 CDN.

Ecohome: Why There Is Frost in Attics
Ecohome says frost forms in attics when warm, humid air accumulates and condenses on the underside of roof sheathing. Depending on the temperature, you will have either frost or water collecting. A little bit of frost forming is not unusual after really low nighttime temperatures, and it isn't a huge problem if it is able to melt and evaporate so that wood can dry.

Energy Vanguard: Tale Of Two Roofs & Frost, Snow, Attic Heat Loss
Energy Vanguard describes two roofs and the effects of frost, snow, and attic heat loss. These show what happens when ceilings are porous to heat.

Energy Vanguard: When It Comes To Ice Dams, You Can Fix Stupid
Energy Vanguard says when it comes to ice dams, we know how to fix what is the most common cause.

Fine Homebuilding: Ice Dam Causes & Solutions
Fine Homebuilding describes causes and solutions for ice dams.

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

GBA: Air Leaks From House To Attic Need To Be Sealed
Green Building Advisor says if a house has an attic, there needs to be an air barrier that keeps the attic space separate from the rest of the building.

GBA: Air Sealing An Attic
Green Building Advisor describes the four basic steps to sealing attic air leaks: inspecting your attic; patching the big holes; sealing the cracks and small holes; weatherstripping the access hatch.

GBA: All About Attics
Green Building Advisor provides answers to frequently asked questions about the space under your roof.

GBA: Attic Ventilation May Not Solve All Moisture Problems
Green Building Advisor discusses whether mold on plywood in this attic is the result of inadequate attic ventilation or air leakage. More attic ventilation would not have solved this mold and moisture problem; extensive air sealing will (and reduce the energy bills as well), however.

GBA: Heading Off Ice Dams
Green Building Advisor provides suggestions on how to stop ice damming.

GBA: Insulated Rooflines & Shingle Temperatures
Green Building Advisor describes research from Florida that shows shingles don't get much hotter with spray foam insulation under the roof sheathing.

GBA: Prevent Ice Dams With Air Sealing & Insulation
Green Building Advisor describes how to prevent ice dams with air sealing and insulation, and says installing roof ventilation and rubber membranes are admissions of defeat.

GBA: Rethinking Ventilated Attics
Green Building Advisor discusses how to stop mold growth in attic in coastal climates.

GBA: Say No to Swiss Cheese Attic Floors
Green Building Advisor says ceilings with lots of air leaks are an invitation for moisture problems in winter.

GBA: Solving Ice Dam Problem With Exterior Rigid Foam
Green Building Advisor says eight inches of polyiso, a second layer of roof sheathing, and new shingles cost the same as a standing-seam roof without any insulation.

GBA: There's Mold in My Attic
Green Building Advisor discusses how to address attic mold after in a seasonal cabin converted to year-round use.

GBA: There's Rot in the Roof
Green Building Advisor describes an unvented low-slope roof that is showing signs of water damage, and asks what the best fix is.

IRC: Air Leakage vs. Air Intrusion In Low-sloped Roofing Assemblies
Canadian Institute for Research in Construction study clarified how air intrusion in mechanically- attached, low-sloped membrane roofs differs from air leakage through wall and window assemblies. (PDF)

IRC: Wind-RCI free Online Wind Load Calculator For Roofs
IRC Wind-RCI (Wind-Roof Calculator on Internet) is a web-based roof wind design calculator developed to improve the design of roofs by calculating wind loads. It calculates wind uplift design loads as a function of various parameters such as roof type, slope, wind speed, building height, roof area, building terrain, building type and openings.

JLC: Avoiding Wet Roofs
Journal of Light Construction provides a building-science guide to insulating attics and roofs.

JLC: Ice Dam Membrane at Eaves
Journal of Light Construction describes considerations for the height of ice dam membrane at eaves.

Morrison Hershfield: Controlling Mold Growth In Attics In BC Marine Climate
Morrison Hershfield online slide show presentation Controlling Mold Growth in Ventilated Wood-Frame Attics in BC's Cool Marine Climate demonstrates that passive attic ventilation is not enough to control moisture in, and fungal growth on, wood sheathing and framing in well insulated attics in cool marine climates. It discusses code required venting area and distribution, good practice for ceiling airtightness, low to moderate indoor humidity, and mold growth. (Large PDF)

ORNL: Energy & Moisture Performance Of Attic Assemblies
Oak ridge National Laboratory report Energy & Moisture Performance Of Attic Assemblies describes how energy and moisture performance of attic assemblies can be varied by a large number of construction features that have been recently introduced into the marketplace. Specifically, the introduction of underlayments with highly variable water vapor permeances, the inclusion of a radiant barrier, a cool roof, the amount of ventilation area, and above-sheathing ventilation all can change how an attic performs hygrothermally. The recent use of sealed attics and the movement of the insulation from the attic floor to the rafters can also impact attic performance. (PDF)

RDH: Mold In Vented Wood-Frame Roofs In Pacific Northwest
RDH Building Engineering technical bulletin Mold in Vented Wood-Frame Roofs in the Pacific Northwest outlines the causes of the common moisture problems in vented wood-frame roofs, as well as potential solutions. (PDF)

RDH: Why Wood Frame Attics Get Wet & Moldy In Pacific Northwest
RDH Building Engineering paper Why Wood Frame Attics Get Wet & Moldy in the Pacific Northwest summarizes their study that investigated sheathing moisture absorption caused by night sky cooling and ventilation air condensation as well as the impact of shingle underlayment types on potential exterior moisture sources. (PDF)

RJC: How Much Snow is Too Much for a Roof?
Read Jones Christoffersen says the amount of snow a roof can hold depends on the geographic location of the building, its construction, exposure to its surroundings and whether the number of freeze-thaw cycles experienced during the season has caused ice to form on the building’s roof. (PDF)

Roof Wind Designer: Free Online Design App For Wind Loads
National Roofing Contractors Association web-based program helps designers determine the wind loading on low-slope roofs so they can satisfy code and survive high-wind events. Designed primarily for agricultural, commercial, and industrial buildings, the program is free to use once you register on the Web site.

US DOE: Moisture Risk In Unvented Attics Due To Air Leakage Paths
US Department of Energy report Moisture Risk in Unvented Attics Due to Air Leakage Paths summarizes initial analysis of moisture damage potential in an unvented attic insulated with closed-cell spray polyurethane foam. The results indicate that localized damage due to high moisture content of the roof sheathing is possible under very low airflow rates. (PDF)

US DOE: Results Of Roof-Only Air Sealing On 1 1/2-Story Homes In Cold Climates
US Department of Energy report Airtightness Results of Roof-Only Air Sealing Strategies on 1 1/2-Story Homes in Cold Climates shows the wide variation in air leakage reduction across the combined data indicates that there is a continued need to help contractors understand best practices for air sealing existing 1 1/2-story homes, especially under the variety of conditions that might be encountered. (PDF)

US DOE: Roof & Attic Thermal Radiation Control Retrofit Strategies For Cooling Climates
US Department of Energy report Internal Roof and Attic Thermal Radiation Control Retrofit Strategies for Cooling-Dominated Climates evaluates the cooling energy savings and cost effectiveness of radiation control retrofit strategies for residential attics in US cooling-dominated climates. (PDF)

US DOE: Water Managed Existing Roof Penetrations
US Department of Energy describes issues and considerations for installing water managed roof penetrations in existing homes.

APA: Proper Installation Of Sheathing For Roofs
Engineered Wood Association bulletin offers step-by-step instructions for roof sheathing installation.

BC Housing: Illustrated Guide R30+ Effective Vaulted & Flat Roofs
BC Housing downloadable Illustrated Guide R30+ Effective Vaulted & Flat Roofs consolidates information on vaulted water-shedding roofs and flat waterproof membrane roofs that are capable of meeting R-30 or greater effective thermal performance when used on low- and mid-rise wood-frame buildings.

BC Housing: Maintaining Multi-Family Roofs
BC Housing bulletin provides practical information on how to maintain a roof on a multi-family building. (PDF)

BCBEC: Online Video On Building Smart With Roofs
BC Building Envelope Council online video covers the half-day industry workshop on Building Smart With Roofs.

Building Science: Field Performance Of Unvented Cathedral Ceiling In Vancouver
Building Science test program described in this paper sets out to determine whether or not an assembly that meets the new IRC code requirements but is constructed without a vapor barrier and using an air impermeable, vapor permeable, low-density, open-cell sprayed polyurethane foam insulation can perform satisfactorily in the cold wet climates of Seattle, WA and Vancouver, BC (Zone 4C). (PDF)

Building Science: High R-Value Roofs
Building Science research report High-R Roofs Case Study Analysis summarizes research to find optimally designed, cost effective roof insulation systems that can be included with other enclosure details to help reduce whole house energy use by 70%. It compares a variety of roof insulating strategies and presents their advantages and disadvantages according to several comparison criteria. (PDF)

Building Science: Performance Of Unvented Cathedralized Attics In USA
Building Scence article reports on field experience of unvented cathedralized attics in several environments in the United States.

Building Science: Proper Design Of Wall & Roof Systems
Building Science online slide show presentation describes context for residential construction, moisture control, energy transfer, wall systems, and roof & attic systems. (PDF)

Building Science: Rehab Of Roofs
Building Science online slide show presentation describes issues and considerations for energy efficient rehab of roof systems. (PDF)

Building Science: Roof Design Considerations
Building Science describes how roofs can be designed and constructed to be either vented or unvented in any hygrothermal zone.

Building Science: Roofing Issues & Considerations
Building Science online slide show presentation on roofing describes issues and design considerations for low-slope, pitched, membrane, metal, and other related materials. (PDF)

Building Science: Roofs Attics & Cathedrals
Building Science online presentation by Dr. John Straube describes methods and options for proper design, installation and troubleshooting of roofs, attics, and cathedrals. (PDF)

Building Science: Unvented & Hybrid Roof Assemblies
Building Science describes issues and considerations for unvented and hybrid roof assemblies.

Building Science: Wood Pitched Roof Construction
Building Science digest describes the most common types of wood pitched roofs, their enclosure functions, and common modes of failure.

CBE: Purchasable Book Roof Framer's Bible
Construction Book Express sells Roof Framer's Bible - The Complete Pocket Reference to Roof Framing. This pocket-sized guide contains framing charts for just about any gable, hip, shed, and polygon roof you'll ever see, including irregular bastard hips. In addition to rafter lengths, you'll find detailed layout and cutting information on all bevels, cuts, hip drops, and fascia boards. $48 USD

Construction Canada: Options for Preventative Roof Maintenance
Construction Canada says although roofs come with maintenance manuals, they do not have a dashboard with warning lights, and many owners only realize there is a problem after experiencing leakages or failures, which could have been prevented.

Do It Yourself: Framing Shed Dormers
Do It Yourself provides online step-to-step guide on framing shed dormers.

Energy Vanguard: Air Sealing & Insulating Opportunity On Fascia
Energy Vanguard describes some air sealing and insulating opportunities that may be possible if you are repairing soffit and fascia boards.

Fine Homebuilding: 10 Roof Goofs and How to Fix Them
Fine Homebuilding says installation mistakes are often to blame for leaky roofs. Roofer Stephen Hazlett shows how to repair these problems or avoid them altogether. (PDF)

Fine Homebuilding: Extra-Deep Roof Framing
Fine Homebuilding describes how the ProHOME includes a clever approach to creating 20 inch deep rafter bays for extra dense-pack cellulose insulation.

Fine Homebuilding: Laying Out A Common Rafter
Fine Homebuilding article on laying out a common rafter describes basic building block of roof framing for simple gable or shed roofs.

Fine Homebuilding: Overview On Sheathing A Roof
Fine Homebuilding article (with drawings) has some good tips and info that may help save some time and money when sheathing a roof. Free registration required.

GBA: Designing A Low-Slope Roof That Works
Green Building Advisor weighs pros and cons of different roof coverings, types of insulation to use, whether it should go above or below the roof sheathing, and whether the roof should be vented or unvented.

GBA: Every House Needs Roof Overhangs
Green Building Advisor says a house with improper overhangs can overheat in the summer, can suffer from water entry problems at windows and doors, and can have premature siding rot.

GBA: How To Build An Insulated Cathedral Ceiling
Green Building Advisor says whether you decide to make it vented or unvented, get the details right, because every cathedral ceiling offers opportunities to make big mistakes.

GBA: Ten Rules Of Roof Design
Green Building Advisor says lots of things can go wrong with roofs, from bad flashing causing leaks to poorly designed valleys that can turn into slow-moving glaciers. For the best performance, build a simple roof shape over a vented unconditioned attic.

Google: Pitch Gauge App For Roofs
Android app Roof Pitch 2.1 will instantly tell you the proper pitch of a roof.

JLC Forums: Basics For Roof Cutting Of HP & Valley Rafters
Journal of Light Construction forum provides a Sketchup demo to illustrate roof cutting basics for hip & valley rafters, regular or irregular. This simple concept is applicable to all flat slope roofs and also works for either 90 degree plan-view corners or dog-leg intersecting angles, and for any combination of pitches, equal or unequal.

JLC Forums: Formulas & Geometry For Hip & Valley Roof Compound Angles
Journal of Light Construction forums provides links and comments about geometric formulas for cutting complex roofs.

JLC: Designing Dormers
Journal of Light Construction offers tips for designing dormeers and examples of dormers with proper scale and placement.

JLC: Dressing Up A Truss Roof With Stick Framing
Journal Light Construction article describes how to dress up truss roof rafter tails and gable overhangs, using trusses for part of the roof and stick-framing for the rest, to transform an otherwise plain-looking exterior. (PDF) Free Registration Required

JLC: Estimating Roof Area Using A Spreadsheet
Journal of Light Construction describes how to estimate roof area using a spreadsheet.

JLC: Framing High Performance Roof Overhangs
Journal of Light Construction describes tricky details of framing cathedral roofs in Passive House construction.

JLC: Framing Roofs With Wood I-Joists
Journal of Light Construction describes how wood I-joists require special connections to create a working roof assembly.

JLC: Joining Two Roofs of Different Pitches
Journal of Light Construction describes issues and considerations for joining two roofs of different pitches.

JLC: Laying Out Irregular Valley Rafter
Journal of Light Construction says if you know the system, you can cut an irregular roof right the first time. (PDF) Free Registration Required

JLC: Low-Slope Roofing Details That Work
Journal of Light Construction says positive slope and easy drainage are keys to success for low-slope roofing.

JLC: Roof Framing Measurements
Journal of Light Construction online video by framing veteran Mike Sloggatt describes importance of accurate measurements for roof framing.

JLC: Unvented Roofs & Shingle Warranties
Journal of Light Construction Q & A says if an unvented roof is insulated according to IRC guidelines and recommendations of the sprayed-in-place foam manufacturer are followed, and if dewpoint calculations confirm that condensation will not occur within the roof assembly, there should not be any problems with shingle warranties.

NRCA: Roof Checkup Guide For Homeowners
US National Roofing Contractors Association guide helps homeowners understand need and process for checking their roof in fall and spring.

ORNL: Online Roof Savings Calculator
Roof Savings Calculator was developed as an industry-consensus roof savings calculator for commercial and residential buildings using whole-building energy simulations. It is built upon the DOE-2.1E engine for fast energy simulation and integrates AtticSim for advanced modeling of modern attic and cool roofing technologies. An annual simulation of hour-by-hour performance is calculated for the building properties provided based on weather data for the selected location.

Pro Builder: 5 Steps To Proper Roof Sheathing Installation
Professional Builder describes simple installation steps for plywood and OSB roof sheathing to ensure optimal performance and minimize callbacks.

RCABC: Online BC Roofing Practices Manual
Roofing Contractors Association of BC online Roofing Practices Manual provides industry information on Roofstar guarantee program, roof system components, built-up roofing, flexible membrane systems, shingled roof systems, architectural metal roofing, waterproofing systems for plazas promenades and terraces, construction details, and general information.

RDH: Unvented Sloped Wood-Framed Roofs in Cold Climates
RDH Building Science online slide show presentation provides a State of the Art Review of Unvented Sloped Wood-Framed Roofs in Cold Climates. (PDF)

Remodeling: Avoiding Roofing Errors
Remodeling Magazine says when it comes to keeping water out of a building, fine details matter. They describe some layout problems, incorrect kickout flashing, and leaking metal flashing.

Roof Help: Tips For Preventative Maintenance Of Roofs
Roof Help provides article on steps of preventative maintenance for various roof types, and supplies links to other resources.

This Is Carpentry: DVDs On Roof Framing For The Professional
This Is Carpentry describes Will Holladay's DVD program, Roof Framing for the Professional, saying he goes a little more in-depth than many others.

This Is Carpentry: Mastering The Dutch Hip
This Is Carpentry describes how to cut and stack a Dutch hip roof.

Thor Systems Inc: Roofing Layout Tape
Thor Systems Inc. gives product info sheet on their new Roofing Layout Tape. The tapes include all marks necessary to install a perfect roof quickly, accurately and profitably.

US DOE: Evaluation Of Two Advanced Weatherization Approaches, Attic Or Roof?
US Department of Energy report Attic or Roof? An Evaluation of Two Advanced Weatherization Packages, examines two approaches to retrofit. One is best practice air sealing methods and a standard insulation method to the attic floor. The other creates an unvented roof assembly using materials and methods typically available to weatherization contractors. The research found that the two different strategies achieve similar air leakage and energy performance improvement. The cost for the unvented, roof rafter insulation approach was found to be about $7,000 more than air sealing and insulating at the attic floor. However, the roof rafter insulation strategy could also be viewed as a very cost-effective strategy to increase, by roughly 50%, the usable above-grade conditioned floor area.

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: Water Management When Re-Roofing Sloped Roof
Building America Solution Center describes considerations for re-roofing an existing home and adding exterior rigid insulation above the roof deck before installing the new cladding to improve the durability and moisture control of the roof as well as to improve thermal performance and provide a conditioned attic.

US HUD: Rehab Guide Volume 3: Roofs
US Department Of Housing And Urban Development supplies free Rehab Guide Volume 3: Roofs that gives detailed info on products and procedures for upgrading roofs. (PDF)

WBDG: High Performance Roofing Systems
Whole Building Design Guide describes issues and considerations for high performance roofing assemblies. It covers introduction, material descriptions, applications, drawings, emerging issues, relevant codes and standards, and additional resources.

WoodWorks: Long & Short of Wood Roof Systems
WoodWorks online slide show presentation provides an overview of the many framing systems commonly used in buildings, for a variety of span lengths. It reviews the possible wood structural framing systems including rafters, metal plated wood trusses, engineered wood products and hybrid roof systems. (PDF)
Product Supply

BD&C: What Specifiers Look For In A Roof
Building Design & Construction survey shows when evaluating the merits of roofing systems, specifiers generally consider product performance record, warranty, and the manufacturer reputation before all other attributes, according to a recent survey of 300 designers, contractors, and building owner/developers.

For Residential Pros: New Roof Products With Green Features
For Residential Pros article describes new roof products from traditional tile and shingles to modern metal, that offer green features.

For Residential Pros: Some Roof Products Experiencing Growth
For Residential Pros article says most of the roofing category has flattened out recently, but certain product segments are remaining strong and manufacturers are continuing to roll out new and innovative products to meet an even increasing demand.

QR: Roofing Trends, Regionalities Drive Innovations
Qualified Remodeler says hail, wind, sunshine and local architectural styles drive a new wave of products to the roofing market.
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