Tar and gravel roofs, also for flat roofs, are best for rooftop decks with heavy foot traffic. Introduction roof is the uppermost covering provided over a building with a view to protect the building from rain, heat, wind, snow etc. Class abciiiiii flame spread, class abc roof coverings. Roof coverings and best practices roof coverings and.
Roof and roof covering roof truss free 30day trial scribd. This heavy roofing consists of layers of asphalt, tar or adhesive topped with an aggregate and is only for flat roofs. Flat roofs are nothing new, nor are some of the proven materials that cover these oftenexpansive roofs such as those found on factories, warehouses, big and small box stores, apartment buildings, large public structures and schoolsuniversities. The patios roof can make an architectural statement, coordinate with the homes existing roof or be entirely different. Being made of synthetic rubber or polymer, they are flexible and elastic and can handle temperature changes and some impact types better than builtup roofs.
Roof systems typically fail when winds produce forces greater than. R19204 roofcovering materials, impact resistance roofcovering materials, impact resistance see general information for roofcovering materials, impact resistance metrotile mfg, dba metro roof products r19204 3093 industry st ste a oceanside,ca920544895usa. In ibc 2015 chapter 15 roof assemblies and rooftop structures, table 1505. For type v, structural elements and exterior and interior walls of any materials are permitted. Prepared roofcovering materials, formed or molded metal, fibercement, plastic or fireretardanttreated wood see general information for prepared roofcovering materials, formed or molded metal, fibercement, plastic or fireretardanttreated wood gerard roof products l l c, dba gerard roofing technologies r12596 3093 industry st oceanside. This will depend upon the size of the roof and the type of roof covering the roof has to support. Eight ecofriendly roofing materials when building a roof. Rain will wash small quantities of the zinc, which acts as a fungicide, onto the roof. Finally, here is a video about choosing the right roofing materials. Download as ppt, pdf, txt or read online from scribd. These are just two of the most popular roof coverings. Certainteed corp 14 00 union meeting rd po box 1100 blue bell, pa 19422 this is to certify that representative samples of prepared roof covering materials class a fire resistant, asphalt glass fiber mat shingles, designated.
Roof deck sheathing roof covering materials such as asphalt shingles must be installed on solidly sheathed roofs. Various types of roofs covering material are available, again in different materials. Epdm is a synthetic roofing material often referred to as rubber roofing. These roofs are installed as thin sheet materials 0. List of commercially available roofing materials wikipedia. Examples of common class c building materials include untreated wood shakes and shingles, plywood, and particleboard. Wooden shingles, slate shingles, cement shingles, clay tile. The outer layer of a roof shows great variation dependent upon availability of material. The tendency is to assume that class a roof systems have a class a flame spread, and so on, but there is no correlation. The main problem with the membranes of pvc flat roof coverings are their incompatibility with asphalt, which will eat away at these membranes. Walkable pvc roof deck membranes have to go through the same rigorous product material standards and fire test of roof coverings as thinner thermoplastic single. Roof coverings are addressed in chapter 15 of the ibc and chapter 9 of the irc. Neoprene polychloroprene epdm ethylene propylene diene monomer pvc polyvinyl chloride chlorinated polyethylene and chlorosulfonated polyethylene sheets.
In this guide well cover the following roofing options. This comprehensive guide to roofing materials is all the research you need to evaluate the top choices for residential reroofing and new construction projects in 2020. This involves covering the roof in epdm and then adding a frame that can be filled with soil and planted with a mix of grass and flower seeds. Roof coverings must be tested and approved by underwriters laboratories ul or factory mutual fm and be rated as a class 1, 2, 3 or 4. Roofing material is the outermost layer on the roof of a building, sometimes selfsupporting, but generally supported by an underlying structure. In traditionally constructed roofs, the roof may also require added support in the form of roof trusses. Ul 2218 standard for impact resistance of prepared roof. The guide discusses the characteristics and qualities of cedar shakes and shingles and identifies lookalike cedar roofing material alternatives that are available. The system consists of a roof covering and roof deck or a single component serving as both the roof cover ing and the roof deck. New roof coverings shall not be installed without first removing all existing layers of roof coverings where any of the following conditions exist. Roof structures roofs section1 module 3 sheet 15 12section ke skill setting out and determining roof bevels there are a number of ways that the length and angle of members can be determined. If the roof covering is light, this roof truss can be used up to 30 m.
E04d334 roof covering by making use of flat or curved slabs or stiff sheets with special crosssection, e. Double roof with hipped end there are many designs and combinations of double roofs. The range of choices available when it comes to your roof can be daunting. See general information for prepared roofcovering materials, formed or molded metal, fibercement, plastic or fire retardanttreated wood certified for canada gerard roof products l l c, dba gerard roofing. Chapter 8 presented information on roofing materials and coverings. Pitched, or sloped, roofs range from a moderately sloped 3in12 pitch to the 45degree angle 12in12 slope commonly seen on aframe roofs. Flat roof coverings firring piece on each joistfacia roof deck and finish to create fall to gutter roof joists at 600mm centressoffit flat roof coverings on the deck can be. Chlorinated polyethylene and chlorosulfonated polyethylene sheets. In certain coastal areas, airborne algae can cause dark streaks on asphalt shingles. Roof covering materials are required to comply also with other requirements for construction, material specifications, and performance as applicable to specific types, designs, sizes and arrangements. A wide variety of types of roof covering sheets options are available to you, such as pp, pc, and pvc. Here we take a look at the different roof coverings available, from the types of roof.
Your roof type dictates what roofing material you can select. Class abc roof coverings class a, b, or c roofing systems are sometimes confused with class abciiiiii flame spread categories above. The 7 most popular shed roof materials in detail zacs. A roof consists of a frame work supported on walls or columns.
Roofing materials for pitched roofs include the following. The astm e108ul 790 roof coverings test does not produce a flame spread rating. Pisello, in ecoefficient materials for mitigating building cooling needs, 2015. Ansiul 790astm e108, tests for fire resistance of roof covering materials.
The asphalt shingles, valued for their fire resistance and lower cost, came in numerous colors, patterns, and shapes. Roofs is one in a series of guidebooks produced by the u. Both codes provide requirements for roof coverings commonly used on highsloped roofs such as asphalt shingles, clay and concrete tile, wood shakes and shingles, and metal roofing and for roof coverings typically used for lowslope. If your shed roof is flat or has a pitch of 18 degrees or less, consider building a green roof on it. Prepared roof covering materials provide class a, b or c coverings. Composite roof trusses roof trusses made of two materials, such as timber and steel, are known as composite roof trusses. The materials used on it should correspond to the overall design. A buildings roofing material provides shelter from the natural elements. Also within section 1507, there are requirements for other components that are. It is similar to rolled asphalt roofing in that it is applied in large sheets that limit the number of seams where water can infiltrate. Prepared roof covering materials asphalt glass fiber mat shingles designated glassseal, elite glassseal, heritage, heritage ir, heritage woodgate, heritage premium, heritage vintage and shingle starter for installation as class a prepared roof coverings, suitable for installation on minimum 38 in. Variations in terms of roof structure, pitch and roof covering lead to some unusual and inventive designs. A roof assembly includes the roof deck, vapor retarder, substrate or thermal barrier, insulation, vapor retarderand roof covering. Diffuse greenhouse covering materials material technology, measurements and evaluation of optical properties s.
All roof cover types and configurations that do not meet level b. Those types of roofing material which are commercially available range from natural products such as thatch and slate to commercially produced products such as tiles and polycarbonate sheeting. The most important thing when choosing a flat roof covering. For purposes of this standard prepared roof covering materials are considered to be small units, sheets or panels designed for installation with multiple layers of such materials installed in overlapping rows normally on inclines exceeding 25 percent. Pdf study of different pitched roof types researchgate. A complete guide to commercial flat roofing systems. Depending upon the roof covering material, the rafters are spaced 30 to 45 cm centre. The term is defined in section 1502 definitions as. Nov 22, 2018 belfast roof truss bow string truss this truss, in the form of a bow, consists of thin sections of timber, with its top chord curved. This will depend upon the size of the roof and the type of roof covering the roof. Choosing the best flat roof covering for your home depends on your climate, budget and intended usage. Roof coverings shall be applied in accordance with this chapter and the manufacturers installation instructions. For roofs with a 3in12 pitch or less, tar and gravel, bitumen, roll roofing, or even metal sheet roofs work well.
There are many parameters to consider when good roof performance is desired. Install a zinc strip near or at the roof ridge to minimize growth of moss or fungus. Understanding fire ratings national roofing contractors. These roofing products were used on many older homes when originally built, but. These roofs may become sticky in summer, and it is harder to shovel snow off of these roofs when compared to smooth surfaces. Roof covering materials astm e108 and nfpa 256, ul 997, wind resistance of prepared roof covering materials astm d3161, ul 2218, impact resistance of prepared roof covering materials and ul 1897, uplift tests for roof covering systems. Other popular materials include slate tiles, metal roofing, wood shakes and even green roofs in certain parts of the world. Pvc flat roof coverings are applied in rolls and heatwelded at the seams. The outer layer of a roof shows great variation dependent upon availability of material, and the nature of the supporting structure. Flat or nearly flat roofs must be covered with builtup roofs such as tar and gravel or more modern counterparts to keep water out. Diffuse greenhouse covering materials material technology.
As previously mentioned, the most diffused products concerning highalbedo coatings involve asphalt shingles, metal roof coverings, clay or cementbased tiles, and optimized bitumen roofing systems levinson et al. Solidly sheathed roofs include structural panels such as plywood and oriented strand. The best flat roof covering options homeadvancement. For roofs with a 3in12 pitch or less, tar and gravel, bitumen, roll roofing, or even metal sheet roofs. Predominant roof covering rule roof covering should be determined by using the roof covering that comprises greater than 50% of the roof. Sheet metal, concrete interlocking tiles, clay tiles. The main energy components are those derived from manufacture and transport. Guideinfo roof covering materials roofing systems provide class a, b or c coverings over combustible andor noncombustible steel, concrete or poured gypsum decks. Both codes provide requirements for roof coverings commonly used on highsloped roofs such as asphalt shingles, clay and concrete tile, wood shakes and shingles, and metal roofing and for roof coverings. Key issues embodied energy theres a wide scale of embodied energy from wood shingles at the low end of the range to aluminium at the high. Other popular materials include slate tiles, metal roofing, wood shakes and even green roofs. A principal division among roofing materials has to do with the pitch of the roof. Astm d3462, asphalt shingles made from glassfelt and surfaced with mineral granules.
While this video centers on home roofs, the basic concepts can be applied to finding the right roof. If roofing is unrated, this means it could not pass even the requirements for class c roofing materials. It is a passfail test under which a product either passes the criteria as a class a, b or c roof covering system or it doesnt. Roof coverings that have passed the ul standard 2218 test are classified by ul as either class 1, 2, 3 or 4. Prepared roof covering materials, formed or molded metal, fibercement, plastic or fireretardanttreated wood tfxx and buildingintegrated photovoltaic modules and panels qhzk. Ibc 2009 uses the term roof covering to refer to a particular type of roofing product or system. Materials for gable roofs with a pitch of 312 or more. R19204 roofcovering materials, impact resistance roofcovering materials, impact resistance see general information for roofcovering materials, impact resistance metrotile mfg, dba metro roof.
The aspects of a roof, which may contribute to the special interest of a protected structure or a structure within an aca, include the profile and structure of the roof, the cladding materials used and other. The process of installing an additional roof covering. Any material or combination of materials used as a roof covering, such as membrane, corrugated metal, sheet metal, shingles, slate, thatch, tiles and membrane. There are slate roofs hundreds of years old that are still functioning. Astm d3161, wind resistance of prepared roof covering materials.
In a roof with a 412 pitch, the roof drops 4 inches for every 12 inches it travels horizontally. These flat roof coverings are very pliable and durable, with excellent heat and puncture resistance. Independence, hatteras, accessory for hatteras, highland slate, grand manor, carriage house. Consider impactresistant roofing material when choosing your next roof. This presentation includes the types of roofs and roof covering materials. Prepared roof covering materials provide class a, b or c coverings over combustible decks. Even steeper are many mansard roofs and parts of gambrel roofs, such as on barns, which may have 20in12 pitches. Installation of roof coverings shall comply with the applicable provisions of section 1507. Astm d3018, class a asphalt shingles surfaced with mineral granules. In modern double roof construction, the whole of the roof is constructed of lightweight roof trusses called trussed rafters see module 4. Types of roofing material when it comes time to choosing a new roof, some key considerations are the type of material, style, color and of course, cost. A slate roof is perhaps the finest roofing material there isa choice for the homeowner who will accept only the finest.
The most popular roof covering in the entire world is roofing tiles while here in the united states, asphalt shingles dominate the market. The main forms of flat roof coverings include rubber, pvc, modified bitumen and tar and gravel. A roof is the top covering of a building, including all materials and constructions necessary to. The objective of this guide is to identify alternative roofing materials to cedar shakes and shingles that are available in todays market.
Prepared roof covering materials asphalt glass fiber mat shingles designated glassseal, elite glassseal, heritage, heritage ir, heritage woodgate, heritage premium, heritage vintage and shingle starter for installation as class a prepared roof coverings. Roof felt, sheet metal, shingles, tiles clay or concrete 20 plus degrees. Jul 17, 2017 even though a patio is often hidden in the back of the house, its design and roof should coordinate with the homes exterior color for a cohesive, unified look. Roof coverings and best practices roof coverings and best. The 5 roofing alternatives you may not have considered. Box 16, bornsesteeg 65 6700 aa wageningen the netherlands keywords. This comprehensive guide to roofing materials is all the research you need to evaluate the top choices for residential re roofing and new construction projects in 2020. The covering applied to the roof deck for weather resistance, fire classification or appearance. The most important thing when choosing a flat roof covering is hiring a qualified installer. Report on roof and roof covering linkedin slideshare. All such additional requirements are not considered to be within the scope of these requirements for fire tests. Maintain the roofs flashing to prevent the roof from leaking. Along with cost and lifespan considerations, color and texture are often key factors when selecting a roof covering.
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