Roofs are one of the universal structures found on all buildings. Their purpose is primarily to shed water off the building and to prevent it from accumulating on top. To achieve this goal, Roofs may be highly pitched (sloped) or low sloped in form. Low sloped roofs are commonly found on industrial/commercial type structures. Pitched roofs are the primary design found on residential homes. The most common type of low sloped roof for industrial/commercial structures are the conventional built-up-roof (BUR), modified bitumen, or single plies (EPDM, PVC, TPO). Metal standing seam roofs are becoming increasingly common on low sloped roof assemblies.

Residential roof designs in mild climates or where there is little precipitation tend to exhibit lower pitched roofs and drainage at the exterior wall; an example of residential flat roof is that of the adobe construction in the American Southwest. In northern climates, where temperatures drop below freezing, or in southern climates with high temperatures, the need for greater thermal resistance will dictate the type of roof design as well as the waterproofing membrane specification. In areas that have a high accumulation of snow, such as Buffalo USA or Montreal Canada, a minimum slope of 6 inches in 12 inches (6/12) of roof surface is required. Roof pitches may exceed 45 or 50 degrees.

Cool roofs and green roofs are becoming increasingly popular, and in some cases are mandated by local codes. Cool roofs are defined as roofs with both high reflectivity and high emissivity. Green roofs have soil placed over the waterproofing membrane in which plants and even trees are planted.

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Portland Wants to Make Eco-Roofs and Solar Easier, http://www.myfeedme.com/article/6304382.html
MFM_Utilities (Mike P) Sat, 02 Jan 2010 13:08:29 -0000
Portland Wants to Make Eco-Roofs and Solar Easier, http://www.myfeedme.com/article/6304382.html
Portland Wants to Make Eco-Roofs and Solar Easier, http://www.myfeedme.com/article/6304382.html
MFM_renewables (Mike P) Sat, 02 Jan 2010 13:08:15 -0000
Portland Wants to Make Eco-Roofs and Solar Easier, http://www.myfeedme.com/article/6304382.html
Fiddling with my blog post: ( http://HarrPublishing.com/gardening/2045/how-to-install-snow-guards-on-roofs/ )
2gardening (Gardening) Sat, 02 Jan 2010 12:32:11 -0000
Fiddling with my blog post: ( http://HarrPublishing.com/gardening/2045/how-to-install-snow-guards-on-roofs/ )
New blog post: How To Install Snow Guards On Roofs ? http://bit.ly/5tr6zU
2gardening (Gardening) Sat, 02 Jan 2010 12:32:10 -0000
New blog post: How To Install Snow Guards On Roofs ? http://bit.ly/5tr6zU
Updated my blog with How To Install Snow Guards On Roofs ? http://tinyurl.com/yart23z
2gardening (Gardening) Sat, 02 Jan 2010 12:32:10 -0000
Updated my blog with How To Install Snow Guards On Roofs ? http://tinyurl.com/yart23z
New Photo: The roofs of the bath: The roofs of the Széchenyi Bath. The Széchenyi Medicinal Bath in Budapest is t... http://bit.ly/5R5HlG
budapestphoto (Budapest Daily Photo) Sat, 02 Jan 2010 12:05:41 -0000
New Photo: The roofs of the bath: The roofs of the Széchenyi Bath. The Széchenyi Medicinal Bath in Budapest is t... http://bit.ly/5R5HlG

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