What is the initial solar reflectance of low slope roofs (less than 2:12)?

The initial solar reflectance of low slope roofs, commonly configured with a tilt of less than 2:12, is typically around 0.65. This figure denotes the proportion of solar energy reflected by the roofing surface back into the atmosphere. Higher reflectance values are especially advantageous as they contribute to reducing heat absorption in building materials, thereby enhancing energy efficiency and building comfort. Roofs with a solar reflectance of 0.65 can aid in minimizing cooling costs and decreasing the urban heat island effect.

This information is critical for professionals working with low slope roofing systems, as selecting roofing materials with adequate solar reflectance can impact overall energy performance and compliance with various building codes and standards aimed at sustainability.