•  Traditional roofing system: (by: raghad)

Roofing systems come in a wide range of materials and designs. Traditional roofing systems incorporate asphalt, metal, or concrete materials, though asphalt-made roofs are the most commonly used in the U.S. 

Nearly four-fifths of all homes in the United States use asphalt-shingled roof designs, according to Networx Systems roofing specialists. Asphalt materials provide a low-cost option that’s easy to install compared to other roof designs. Other traditional roofing materials, such as concrete, metal and wood or shake roofing, may carry longer warranties than asphalt as well as offer noise insulation and added durability. With each type of material, homeowners have a variety of options in roof styles. And while asphalt exists as the most commonly used material, it also requires the most maintenance compared to other roofing materials.(1)

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Metal roofs(2)

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references:

(1) Ehow.com (2008) Foam Roof Vs. Traditional Roof | eHow.com. [online] Available at: http://www.ehow.com/info_12137176_foam-roof-vs-traditional-roof.html [Accessed: 19 Sep 2012].

(2) Google.com.my (n.d.) Google Image Result for http://www.builderbill-diy-help.com/image-files/rf-trad-section.gif. [online] Available at: http://www.google.com.my/imgres?imgurl=http://www.builderbill-diy-help.com/image-files/rf-trad-section.gif&imgrefurl=http://www.builderbill-diy-help.com/roof.html&usg=__fdxLOgCXbWzeqVpFYKQ2xJ5W8Rk=&h=250&w=478&sz=5&hl=en&start=10&sig2=a_83lK0GxxOJjJYwVzEQaw&zoom=1&tbnid=wBJiu_EpdxwlnM:&tbnh=67&tbnw=129&ei=rHhZULq3NZO5hAfL1YHICA&prev=/search%3Fq%3Dtraditional%2Broofing%26um%3D1%26hl%3Den%26sa%3DN%26gbv%3D2%26tbm%3Disch&um=1&itbs=1 [Accessed: 19 Sep 2012].