Green roof systems and environmental benefits

Green Roofing

The concept of using green roofing is a relatively knew idea within the field of construction. Yet, as our footprint on the environment continues to show its negative affects on the global scale, it is imperative that we use green concepts in all possible aspects of future designs. Therefore, through nationally regulating green roofing through a series of point scores and other programs which then aim to credit home owner when tax time comes, future builders are ensuring the future success of current green roofing materials and procedures. Through utilizing such new ideas of recycled and natural soil-based vegetation above waterproof layers, home owners are also doing their own part in the fight to stop polluting more than is necessary.

There are several national guidelines set by a variety of public and government agencies on green roofing procedures and materials. It is advised by the National Association of Home Builders (NAHB) to use previously cut building materials, including a pre-manufactured floor and roof framing package. All waste materials coming out of a green building site must be recycled off site, which includes lumber, drywall, and old asphalt roofing singles, (NAHB 2008). At least 50% of the construction waste must be relocated to a recycling facility. Green builders are also rewarded for including a "24-inch on-center framing roof systems," (NAHB 2008). This then allows for the greatest maximization of roof space. Roof sheeting material must take into account natural distortion though deflection. The roof overhang of the region working on must also be taken into consideration during a green roof construction.

All materials used within green roofing constructions must take great measures to minimize moisture intrusion, (NAHB 2008). Green roofing using soil relies on a complex system of drains and irrigation flows in order to direct run off water where it is needed, (Environmental Protection Agency 2008). Materials must be durable in order to withstand the test of time and costly replacements which further pollute the environment with waste, (Chiras 2008). In general, manufacturers try to present a variety of usable green materials which are produced with the least amount of energy possible. When thinking of the energy needed to create a product, one must take into account that of extracting raw materials, processing, and transportation of the finished product to the building site, (Environmental Protection Agency 2008). Recycled materials are also highly favored in the construction of green roofing. Such recycled materials include newsprint, sawdust, cement, recycled rubber, and agricultural fibers, (Snell & Callahan 2005).