Believe it or not, there is no such thing as a flat roof. New low slope roofing manual available this website requires certain cookies to work and uses other cookies to help you have the best experience. For residential low slope owens corning has applied its 75 years of building science technology to introduce the deckseal selfadhered sa roofing system for residential low slope. Nrca steep slope roofing manual pdf click here manual. Appendix 2 provides nrcas guidelines for installation of rooftop photovoltaic components over low slope membrane roof systems. Failure to maintain product as required under the commercial roof systems specification manual 8. Prior to the midtolate 1970s, almost all lowslope roofs were asphalt or coal tar builtup roofs. Low slope roofing products, materials, inspections, low. If a roof has a span of 6m and a rise of 3m then the pitch would be. Typically, low slope roof assemblies are composed of three interrelated components. Low slope roofs or flat roofs, as theyre commonly referred to are more complex than steep slope roofs. Products purchased from third party sellers are not guaranteed by the publisher for quality, authenticity, or access to any online entitlements included with the product.
This guide specification includes materials and installation procedures for 2 ply sbs modified bitumen roofing membrane system over conventional insulated low slope wood deck roof assembly with an air vapour barrier membrane in accordance with the requirements of the nbc for the building envelope. Learn more about finding the angle of a line using our slope calculator. This may improve the appearance of the building while resolving drainage problems as well. Jul 01, 2006 the manual is a widely respected guide to designing, constructing, and maintaining low slope roofing systems. Most builtup roof systems are comprised of three layers of felt and asphalt. Low slope roofing includes water impermeable, or weatherproof, types of roof membranes installed on slopes less than or equal to 3. A warning line system and a safety monitoring system. Nrca and partners offer retirement program services march 5, 2020. This system is a series of multiple layers of asphaltimpregnated sheets of felt paper and hot asphalt. Finding the right products for your low slope roof. This manual replaces all previous versions of the cedar shake and shingle bureau design and application manual for new roof construction. If you set up your own roof maintenance file, you should prepare a roof plan using the following as a guide.
This website requires certain cookies to work and uses other cookies to help you have the best experience. Bur is suitable for most lowslope roofing applications. For architects, roof designers, roof consultants, contractors, spec writers, attorneys, materials manufacturers anyone who needs authoritative, up to date information on all aspects of roof technology the manual of low slope roof systems dominates the field. Glossary of lowslope roofing terms lsg 2 updated august 2017 cant strip. When it comes to low slope roof systems, there are. How to install a deckseal low slope selfadhered roofing system duration. The successful construction of a low slope roof system requires adherence to proper application methods. Most roofing materials asphalt shingles, typical skylights, etc.
Know the pitch of the roof and follow the appropriate standard. Each roof covered by the roofstar guarantee comes with a complete roof system record, which includes a roof plan and a copy of this maintenance guide. Awc updates span calculator app problemsolving deck framing details awc. Nrca roofing norton notch filter pdf anthology notes on excel 2007 pdf of drama shorter ed pdf and waterproofing manual 5th edition hardcover june, 2006. A roofing contractor can enhance the probability of success by administering assurance methods that can be followed by project managers foremen, superintendents, etc. In other words, exterior walls and roofs are sometimes. A workmanship warranty against leaks and defects on low slope roofing systems in the province of alberta. Any component of the roof assembly demonstrating an inherent weakness or inability to perform will diminish the roof system performance and service life expected. Standard for edge systems used with low slope roofing systems, the es1 standard has existed for a number of years. Section c miamidade county hvhz electronic roof permit form section c page low slope roof systems fill in the specific roof assembly components. Use a chart like in the jsa form provided on page 23 to show the. Wind design standard for edge systems used with low slope. Download manual of low slope roof systems griffin c w. A membrane roof system commonly serves as part of an air barrier system for a building.
Low slope roofing installation instructions chapter 2a low slope roofing. There are certain criteria that are required for the proper application of all low slope roof systems. The nrca roofing and waterproofing manual, fifth edition, contains reroofing guidelines for steep and lowslope roofing. A lowslope roof is one that has a slope of less than 3in12. Show changes in roof elevations in a separate sketch. Nrca roofing and waterproofing manual pdf the nrca waterproofing manual by national roofing contractors association on. Steep roof conversions are a viable option for relatively narrow buildings. Click the corresponding letter above to view step by step instructions. Low slope roofing inspection, design, leak detection, repair procedures. Hand split and resawn shakes cedar blocks of appropriate length are split by a hydraulically powered knife, called a cuber, into straight boards, or blanks. Lowslope reroofing guidelines professional roofing magazine.
Employers need to plan ahead to get the job done safely employers need to develop a plan and ensure the proper equipment, material and appropriately trained workers are available. Above roof deck, rigid insulation with a factorylaminated, nailable substrate can be used under malarkey roofing systems, but the use and installation of this product must be in strict compliance with the manufacturers requirements and recommendations. Systems used with low slope roofing systems approved january 24, 2017 page 2 1. Gafglas builtup roofing systems application specifications manual. Understanding how a building is insulated, ventilated, and how the drainage and flashing systems integrate is key to proper performance of a low slope system. Adobe software that allows you to read and to pdf to word converter free pdf to word converter has been designed to allow users to edit pdf cutepdf writer cute pdf writer is a customizable tool that exports windows generated files.
Es1 takes into account all the impor tant factors that go into a properly designed roof edge. Nrca and partners offer retirement program services nrca. Lowslope roof systems flat roof repair in new jersey. Description repair manual for low slope membrane roof systems. A complete table of roof slope, riserun, walkability, angle or slope expressed as grade, and classification of roofs as flat, low slope, and steep slope. Deckseal roofing membranes deliver premium, durable system performance for many challenging low slope applications, such as additions, garages and porches. Low slope roofing systems such as liberty should only be installed on roof slopes of 2 in 12 or higher. Value factor is used to convert future values benefits and costs to. To find the angle of a roof in degrees convert the pitch to a slope, then convert to degrees by finding the arc tangent of the slope.
After youve bought this ebook, you can choose to download either the pdf version or the. This course identifies the information roofing contractors generally need from roof system designers to provide complete and building codecompliant low slope roof systems. Low slope roofs are often referred to as flat roofs. Wind design standard for edge systems used with low slope roofing systems 1. This means that in a horizontal line 12 feet across, your roof would have to rise between 2 feet to just under 4 feet vertically for it to be considered a low slope roof. Residential low slope roofing can generally be divided up into two broad categories. The august 2004 issue of professional roofing featured an article that discussed the steep slope text of the manual see steep slope reroofing considerations, page 28. Bur a continuous semiflexible membrane comprised of plies of organic or. Inadequate slope and poor drainage allows water to pond on a flat roof. May 06, 2016 any roof with a slope under 412 is considered low slope. Lowslope inspection report page 2 profile if known roof construction. The nrca roofing and waterproofing manual, fifth edition, contains.
Nrca steep slope roofing manual pdf click here roofing manual. Low slope roofs traditionally have been constructed with an asphalt builtup roof covering. He is a consulting engineer specializing in roofing and energy conservation and a former senior editor for mcgrawhills engineering newsrecord. To do this simply convert the rise and run as a fraction to a decimal form, eg. Manual of low slope roof systems fourth edition roofing contractor. New roof construction r m a n u a l best materials. The 1993 edition of this publication was the first one to bear the title commercial low slope roofing materials guide. Roof failure causes in depth and specific methods for avoiding them. Nrca defines low slope roof systems as a category of roofing that. From here, well examine these low slope roofing system choices in the chart, from those with the smallest market share to the greatest. Roof pitch this is the angle or slope of the roof and can be expressed in degrees or as a fraction or ratio found by dividing the rise by the span.
Manual of low slope roof systems fourth edition building enclosure. Complete and separate roofing systems, such as d standingseam metal roof systems, that are designed to transmit the roof loads directly to the buildings. A low slope roof is one that has a slope of less than 3in12. Key to potential roof top problems a ponded water b skylight c roof drain. From its inception until 1992, it was titled the roofing materials guide. Credit line shop with points credit card marketplace reload your balance amazon currency converter. Builtup, polymer modified bitumen, singleply, spray polyurethane foambased and structural metal panel roof systems fit this category. Critical aspects of roof system designs are often left unaddressed, resulting in incomplete contract documents. This article defines low slope roofing and describes low slope roofing materials, choices, installations, inspection, defects, roofing repairs, and product sources.
Nrca is partnered with merrill lynch, the krapf group and john hancock retirement plan services to offer additional services for nrca members as part of the nrca retirement program. Low slope roofs or flat roofs, as theyre commonly referred to are more complex than steepslope roofs. May 6, 2016 use membranes, drain to an open edge, slope everything, and read the darned manual s through years of experience in the warranty and handyman repairs division of bowa, i have gotten to know several things that i know do not work. For the larger residential low slope roofing applications, certainteed has a host of products and systems available including bur builtup roofing systems, app modified bitumen systems, and sbs modified bitumen systems, including many products that feature certainteed s coolstar surfaces that meet energy star requirements, can be used to. Steep slope roofs can be covered with shingles, slate, or metal, and low slope roofs have the options of builtup, singleply membrane, or monolithic sprayed foam. Repair manual for low slope membrane roof systems on. For architects, roof designers, roof consultants, contractors, spec writers, attorneys, materials manufacturers anyone who needs authoritative, uptodate information on all aspects of roof technology the manual of low slope roof systems dominates the field.
This article focuses on the low slope reroofing section. Roof plan a roof plan is commonly drawn to a scale of 18. Guidelines for designing lowslope membrane roof systems. If a component is not required, insert not applicable na in the text box. While generally written from the perspective of new construction, the information presented. The term replacement is used when the existing roofing system is to be. Figure 1 depicts the various alternative roofing systems and how they relate. A guide to air barriers in commercial lowslope roof. This chapter is intended to introduce the major considerations in selecting a roofing system. Low slope roofing installation tutorial dan bolduc. Manual of lowslope roof systems fourth edition building.
A roof that is nearly flat or slightly pitched is called a flat roof or low slope roof no roof should be dead flat because it must have at least a slight slope to drain. Identification code a access hatch e expansion joint r roof vent v vent pipe. Low slope roofing products are those primarily intended for roofs with slopes of 3. Nrcas comprehensive repair manual, produced in conjunction with asphalt roofing manufactures association arma and single ply roofing industry spri, will help you identify problems and permanently repair low slope roof membranes. A tool for doing this is the doe cool roof calculator. A good value if you are involved with designing membrane roof systems, using the updated manual can offer a number of advantages. When considering reroofing a flat roof, it may be possible to convert the low slope roofing system to a steeply sloped roof. For decades, this manual has been the most widely respected guide to designing, constructing, and maintaining low slope roofing systems. From here, well examine these low slope roofing system choices in the chart, from. Glossary of lowslope roofing terms vegetated roof systems. Pros and cons of steepslope and lowslope roofs schmidt.
The roof system is defined as the roof membrane including surfacing and the roof insulation. Field flashing a penetration alternative to h or i. A fully searchable pdf version of this publication is available for free download at. Low slope roofing materials guide introduction the 1999 low slope roofing materials guide is a comprehensive report on commercial, industrial, and institutional low slope roof membranes, insulation boards, and fastener products currently on the market, as well as the warranties offered for most membrane roof systems. Standard guide for low slope insulated roof membrane. Steep slope roof systems 20 materials and installation techniques applicable to your projects involving low slope roof system. How to install a low slope roofing system gaf liberty. This standard is intended for use by those that design, specify, manufacturer, and test roofing. Their manuals and websites are a great resource, and most of my. Tremco builtup roofs are formulated from select asphalt blends, polymer modi. Tremco burmastic coldapplied builtup roofs and therm hotapplied builtup roof systems are designed for use on lowslope structures in north america.
Roof details commercial grade flat roof rubber roofing. This guide lists minimum performance attributes required of low slope roof assemblies. Manual of lowslope roof systems fourth edition roofing. This standard focuses primarily on design for wind resistance. Roof slope table table of roof rise, run, slope, types.
Jul 17, 2012 a roof that is nearly flat or slightly pitched is called a flat roof or low slope roof no roof should be dead flat because it must have at least a slight slope to drain. A joint undertaking by the alberta roofing contractors association roofing contractor member and arca, and is available for projects that specify arca accepted roofing systems and materials. Repair manual for lowslope membrane roof systems on. Builtup roofing of felt and asphalt is typically used on flat or low slope roofs below a 3 in 12 slope. A roof is considered to be low slope when the pitch of the roof is below 412 down to and including 212.
The roof assembly is defined as the roof deck, along with the roof membrane and roof insulation. Roof system types roof systems and materials generally are divided into generic classifications. Let our experts help design a system that fits your needs. The repair manual for lowslope membrane roof systems. With the exception of foam and metal, all low slope systems can be incorporated into protected membrane roof pmr designs. Manual of lowslope roof systems mcgrawhill education. A triangular shaped strip of wood or fiberboard that forms a bevelled transition for membranes between the horizontal to vertical planes. Standing seam metal roofs can go down to 312, but anything below that means that means using some type of membrane, a soldered connection, or something that is 100 percent. When engaged in roofing work on low slope roofs 50 feet or less in width, the use of a safety monitoring system without a warning line system is permitted. The repair manual for low slope membrane roof systems. Lowslope roof systems low slope roofs are not actually flat roofs, as they provide more of a slope that allows for drainage albeit slowtomoderate drainage. Note to inspector any item needing action must be noted on the punchlist, page 2 action required no action required. Common roof pitches and equivalent grade, degree, and radian angles.