Best practices for low slope roofs, steep roofs and. Building manufacturers association mbma metal roofing systems design manual. Failure to maintain product as required under the commercial roof systems specification manual 8. Vicwests new rating of 140 pounds per square foot uplift 6. On a gable roof, the inclined edge of the surface to be covered. Tremco builtup roofs are formulated from select asphalt blends, polymer modi. Lowslope roofing systems have also evolved with the increased use of. If a low slope roofing system is improperly installed or the wrong materials used, ponding water and leaks can become. The premier guide to commercial and industrial roofs for decades, this manual has been the most widely respected guide to designing and specifying low slope roof systems. The manual of low slope roof systems fourth edition.
Nrca defines lowslope roof systems as a category of roofing that. Schematic representation of lowslope roofing top and my own analysis bottom, from edward allen, how buildings work, 2nd edition. To provide the roofing industry with the most comprehensive information about the design, materials and installation techniques applicable to all materials used in steepslope roof system applications, nrca has released the nrca roofing manual. The external angle formed by two sides of a roof meeting. Lowslope most materials designed for watershedding roofs are designed for slopes. A wholesystem approach to lowslope roofing asphalt. While generally written from the perspective of new construction, the information presented. Typically, lowslope roof assemblies are composed of three interrelated components. Manual of low slope roof systems fourth edition view and download avidyne ifd540 installation manual online. Material guide and the steepslope roofing manual, both produced by and available. 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.
Lowslope roof system types roof asset learning center. Residential low slope roofing can generally be divided up into two broad categories. Lowslope roofs traditionally have been constructed with an asphalt builtup roof covering. Conversely, some steep slope roof materials may be used on roofs with slopes less than 3. Download it once and read it on your kindle device, pc. In some instances, roof systems designed for low slope applications may be used on roofs with a slope greater than 3. Bureau design and application manual for new roof construction.
Flexible membrane most flat roof systems other than bur fall into the. New ways of access for the first time, the nrca roofing manual. Read manual of lowslope roof systems fourth edition by richard fricklas available from rakuten kobo. Minimum slope for lowslope roof systems with any roofing material, a slope of at least 14 inch per foot is recommended to promote drainage and minimize ponding. Aeb20 manual of low slope roof systems fourth edition. Most lowslope roof membranes have three 3 principal components. Manual of lowslope roof systems fourth edition roofing. The horizontal line formed by the two nailed together rafters of a sloping roof.
This system is a series of multiple layers of asphaltimpregnated sheets of felt paper and hot asphalt. Low slope roofs or flat roofs, as theyre commonly referred to are more complex than steepslope roofs. If questions arise, designers are encouraged to contact the national roofing contractors association nrca members in their geographical area for specific advice. Special care must be taken, however, during material selection and installation for commercial low slope roofing systems, especially considering flatter slopes allow precipitation to roll more slowly off the surface of the roof. Lowslope roofing products are those primarily intended for roofs with slopes of 3. See gaf applications and specification manual or ul directory for specific approvals. Steep slope roofs are watershedding types of roof coverings installed on slopes greater than 3. With many different asphalt roofing products and installation methods available on the market, it is important to understand how to choose the right system and get.
Reinforcement reinforcement adds strength, puncture resistance, and dimensional stability 3. The roof assembly is defined as the roof deck, along with the roof membrane and roof insulation. Most builtup roof systems are comprised of three layers of felt and asphalt. Lowslope roofing may look flat, but except in rare circumstances, it has a minimal slope to eliminate rain water, either over the side perhaps through a scupper, or internally to a roof drain. Description repair manual for lowslope membrane roof systems. Historical background of contemporary roof systems chapter 10.
Builtup, polymer modified bitumen, singleply, spray polyurethane foambased and structural metal panel roof systems fit this category. Flat roofs are those slope is less than 1 in 4 and use waterproof membranes also called low slope pitched roofs have slopes of 1 in 4 or greater and generally use shingles. Low slope roofs or flat deck roofs are among the most commonly specified roofing systems. He is a consulting engineer specializing in roofing and energy conservation and a former senior editor for mcgrawhills engineering newsrecord. Therm builtup roof systems require a minimum slope of.
It remains unique the only working handbook that treats all topics in roof design, from fundamentals to roof systems. Low slope roofing products, materials, inspections, low. Other residential products vents, siding, roll roofing. Therefore, the acquisition team must ensure compliance with the. Jonathan ochshorn lecture notes, arch 26145614 building. Surfacing surfacing of membrane protects it from sunlight and weather. A wholesystem approach to lowslope roofing pdf when installing a new roof, commercial property owners must consider the employees, equipment and inventory they are protecting. 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 lowslope roof systems dominates the field. A solar electric or hot water system can be the feather in your roofs cap. Deckseal roofing membranes deliver premium, durable system performance for many challenging low slope applications, such as additions, garages and porches. Roof failure causes in depth and specific methods for avoiding them. This course identifies the information roofing contractors generally need from roof system designers to provide complete and building codecompliant lowslope roof systems. Manual of lowslope roof systems mcgrawhill education. Overview of roofing materials for forest service facilities.
Roofing systems design manual mbma roofing manual to provide specific design. Membrane roof systems2015 is available on apple, android and windows tablets and for download from nrcas online bookstore, shop the app version and online pdf are the new primary delivery formats for the nrca roofing manual and jointly replace the nrca roofing manual cd, which has been discontinued. For decades, this manual has been the most widely respected guide to designing, constructing, and maintaining lowslope roofing systems. Waterproofing layer or layers the weatherproofing component is the most important element since it keeps water from entering the roof assembly 2. His books include energy conservation in buildings and the systems approach to school construction. Critical aspects of roof system designs are often left unaddressed, resulting in incomplete contract documents. Instead, sealed or membranetype roofing systems are used for lowslope roofs. The new volume updates the 20 volume under the same title and serves as a reference for contractors. The roof system is defined as the roof membrane including surfacing and the roof insulation.
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. Griffin is a member of astm international and the american arbitration association. The builtup roofing committee of the asphalt roofing manu. Bur is suitable for most lowslope roofing applications. For decades, this manual has been the most widely respected guide to designing, constructing, and maintaining lowslope. Table 1estimated cost of roofing systems for sloped roofs. Ifd540 car navigation system pdf manual download view and download garmin gns 530w installation manual online. Because lowslope roofs drain water more slowly than other forms of roofing systems, slate, asphalt, or other roofing systems that rely on mechanical drainage are not commonly used. Roofing solutions reference manual for property managers. Guidelines for designing lowslope membrane roof systems. A guide for the selection of roofing services rcabc. Department of the navy, fall protection guide, us department of the navy. 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 lowslope roof membranes. Systems used with low slope roofing systems approved january 24, 2017 page 2 1.
The repair manual for lowslope membrane roof systems. Nrca steep slope roofing manual pdf click here owens corning has applied its 75 years of building science technology to introduce the deckseal selfadhered sa roofing system for residential low slope. This standard is intended for use by those that design, specify, manufacturer, and test roofing. 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.
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