Let our experts help design a system that fits your needs. This is the preferred system for shingle application, in areas with high humidity or where. The low downward slope of the mansard roof line acts visually to reduce the scale of a building and helps to eliminate a boxy appearance. Overview of roofing materials for forest service facilities.
Roof slope is a very important aspect and it is considered the primary factor in roof design. Lowslope most materials designed for watershedding roofs are designed for slopes. Proper way of securing a ladder rights and responsibilities 14 1. Schematic representation of lowslope roofing top and my own analysis bottom, from edward allen, how buildings work, 2nd edition. Builtup, polymer modified bitumen, singleply, spray polyurethane foam based and structural metal panel roof systems fit this category. 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.
Flexible membrane most flat roof systems other than bur fall into the. 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. However, with the exception of metal roofs, most lowslope roofs have a slope of about 14. Most builtup roof systems are comprised of three layers of felt and asphalt. Nrcas premier technical publication gives you the most current and useful technical information in the roofing industry. This liquid then dries and becomes a bright, clean and modern coating that prolongs the life of your roof. Repair manual for lowslope membrane roof systems, 2nd edition. Lowslope roofs traditionally have been constructed with an asphalt builtup roof covering.
Read manual of lowslope roof systems fourth edition by richard fricklas available from rakuten kobo. Low slope roofs often called flat roofs are relatively. 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. Roof coating options for flat and low slope roof systems. Description repair manual for lowslope membrane roof systems. Well come to your facilityor, if you havent broken ground yet, talk to you about your designand make recommendations based on years of experience with commercial low slope. 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. Material guide and the steepslope roofing manual, both produced by and available from nrca. Residential low slope roofing can generally be divided up into two broad categories. A solar electric or hot water system can be the feather in your roofs cap. Shingles and shakes are generally maintenance free but to increase the longevity, debris accumulating on the. 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.
Lowslope roof systems lowslope roofs are not actually flat roofs, as they provide more of a slope that allows for drainage albeit slowtomoderate drainage. Where the insulation is deeper than the ceiling framing members, a gapfree installation requires two layers. The mansard is particularly well suited to renovation work on pitched roof houses because the upper story can be enlarged without adding extra height to the structure. For decades, this manual has been the most widely respected guide to designing, constructing, and maintaining lowslope roofing systems.
New lowslope roofing manual available this website requires certain cookies to work and uses other cookies to help you have the best experience. Most lowslope roof membranes have three 3 principal components. Repair manual for low slope membrane roof systems manuals for inspection and maintenance guides for building owners for more information about this and other nrca programs delivered directly to your company, contact jeff jarvis, nrcas vice president of membership, sales and business development, at 800 3239545, ext. A lowslope roof is one that has a slope of less than 3in12. 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. Jonathan ochshorn lecture notes, arch 26145614 building. If youre unsure if your roof is lowsloped or not, a general ruleofthumb for flat roofing is a. Low slope roofs or flat roofs, as theyre commonly referred to are more complex than steepslope roofs. The manual is a widely respected guide to designing, constructing, and maintaining lowslope roofing systems. New roof construction cedar shake and shingle bureau. When the slate roof system is treated as a whole, the problems at the interface of mem brane, metal, and shingles are reduced. Additionally, low slope roofing systems more directly face the sun. Roof failure causes in depth and specific methods for avoiding them. 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.
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. See gaf applications and specification manual or ul directory for specific approvals. It is recommended that lowslope roofs have a slope of 12. Griffin is a member of astm international and the american arbitration association. A wholesystem approach to lowslope roofing asphalt. Manual of lowslope roof systems mcgrawhill education. Lowslope roofing systems have also evolved with the increased use of. Roof system types roof systems and materials generally are divided into generic classifications. Deckseal roofing membranes deliver premium, durable system performance for many challenging low slope applications, such as additions, garages and porches. This unbiased, authoritative reference guide of industry best practices for the repair of low slope membrane roof systems, including thermoplastic and thermoset roof membranes, polymermodified bitumen and builtup roofing, and mechanically attached metal flashings, is your goto reference guide for repairs and maintenance.
Lowslope roofing products are those primarily intended for roofs with slopes of 3. Table 1 estimated cost of roofing systems for sloped roofs. Waterproofing layer or layers the weatherproofing component is the most important element since it keeps water from entering the roof assembly 2. Membrane roof systems2015 was released in march and updates and replaces the nrca roofing manual. This course identifies the information roofing contractors generally need from roof system designers to provide complete and building codecompliant lowslope roof systems. Lowslope roof system types roof asset learning center. Elastomeric is an elastic coating which goes on as a liquid. Generally speaking, a roof with a low slope is that which has a pitchmeasured as a. Bureau design and application manual for new roof construction. Builtup, polymer modified bitumen, singleply, spray polyurethane foambased and structural metal panel roof systems fit this category. Identification code a access hatch e expansion joint r roof vent v vent pipe. One of the most widely recognized technical publications in the roofing industry, the nrca roofing manual has been updated to include the nrca roofing manual. Nrca defines lowslope roof systems as a category of roofing that.
As competition is fundamental to the free enterprise system, the main and. Low slope roofing includes water impermeable, or weatherproof, types of roof membranes installed on slopes less than or equal to 3. His books include energy conservation in buildings and the systems approach to school construction. Repair manual for lowslope membrane roof systems on. This system is a series of multiple layers of asphaltimpregnated sheets of felt paper and hot asphalt. He is a consulting engineer specializing in roofing and energy conservation and a former senior editor for mcgrawhills engineering newsrecord. Reinforcement reinforcement adds strength, puncture resistance, and dimensional stability 3. New ways of access for the first time, the nrca roofing manual. The nrca roofing and waterproofing manual, fifth edition.
Thus, to drain the 50 foot span in figure 1 where the drain is placed at the point of maximum deflec tion. While generally written from the perspective of new construction, the information. 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. 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. Historical background of contemporary roof systems chapter 10. Show changes in roof elevations in a separate sketch. Lowslope roof systems flat roof repair in new jersey.
The 2015 manual nrcas mainstay manual is updated and rearranged for ease of use by maciek rupar april 2015 professional roofing 35 the nrca roofing manual. The fourvolume manual gives you comprehensive information about low and steep slope roof system design, materials and installation. 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. As you can see, conklins roof coatings can be applied to any commercial roofing material. For decades, this manual has been the most widely respected guide to designing, constructing, and maintaining lowslope. Put all that water being delivered to your roof for free to good use. Attach roof sketch identifying areas to be covered under this warranty. A guide for the selection of roofing services rcabc. 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. Nrcas mainstay manual is updated and rearranged for ease. The nrca roofing and waterproofing manual, fifth edition, contains. Get your kindle here, or download a free kindle reading app. Critical aspects of roof system designs are often left unaddressed, resulting in incomplete contract documents.
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