Roofing and drainage material and product choice can have a big impact on CO_2 emissions, especially when transportation and other life cycle data is factored in, as this will be affected by products and materials' expected life. Nearby sources do not automatically lower products' or materials' CO_2 emissions as other factors need to be considered. The best guides are EPDs and assessment data from the BRE or other trusted sources. Many roofing and drainage materials, for example metals, are recycled and recyclable and this affects their environmental profile by limiting resource depletion and minimising landfill quantities. Energy used in production and also CO_2 emissions may also be lower where materials have been recycled. Certain forms of roofing construction are inherently less wasteful because work on site, especially cutting, is minimal.
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