Buildings account for one-third of all energy and two-thirds of all electricity generated. Mid-West provides customers with a variety of green steel building options to help reduce energy consumption and support green building efforts to foster environmental, economic, health and community improvement. We are committed to the continuation of developing new green building opportunities and innovations for our customers.
In addition to recyclability, metal roofs and wall panels can reduce waste due to their unmatched durability and resistance to fire, wind and insects. AISI reports that metal roofs last between 40 – 60 years and require less maintenance than other types of roofs.
Solar Reflectance Index (SRI) is used to determine compliance with LEED requirements and is calculated according to ASTM E 1980 using values for reflectance and emissivity. Emissivity is a material’s ability to release absorbed energy. LEED- NC v3.0, SS credit 7.2, requires roofing material to have an SRI value of 78 or higher for low slope (2:12 or less) roofing or an SRI of 29 or higher for steep-slope (greater than 2:12) roofs.
An urban heat island is an elevation of air temperatures in urban communities, relative to surrounding rural areas, caused when vegetation is replaced by large sections of pavement or other dark, non-reflective surfaces. UHIs are believed to not only influence the temperature of the affected area but are also responsible for higher pollutants in the air.
Many of Mid-West’s cool colors meet the reflectivity and emissivity performance levels required by LEED and ENERGY STAR to mitigate UHIs and energy consumption overall. Reflectivity is the deflection of solar energy from a surface. Roofs at 2:12 slope and greater have been proven to generate less of a heat island effect than lower-sloped roofs. Greater reflectivity requires less energy to cool a building.
Emissivity is the relative ability of a surface to emit heat by radiation. When a roof can effectively cool itself through radiating heat loss, it will reduce the amount of energy consumption for the building.
To learn more about our cool colors for metal roofs or to order contact a Mid-West District Manager