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SAP stands for standard assessment procedure. The purpose of these calculations is to measure the energy performance of buildings. These calculations are required by the Building Regulations, introduced by the government in 1995, which deal with the conservation of power and fuel.
A curtain wall is an exterior covering that covers windows and other transparent surfaces. The curtain wall’s materials include steel, wood, and fabric. These materials have different thermal conductivity, so the thermal break between the aluminum and the glass must be suitable for the temperature difference between them. A true thermal break is a minimum of 1/4 inch thick, while polyester reinforced nylon or poured and debridged polyurethane is up to 1 inch thick. The insulation layer between the window and the curtain wall should be insulated to avoid heat transfer.
A building envelope is a structure that protects its interior and exterior from external environmental factors. Properly installed, this system reduces stress on mechanical systems, lowers energy bills, and increases resale value. Although a building’s entire envelope is comprised of several components, they work together to achieve a maximum efficiency level. Replacing one part of the system will increase the building’s overall efficiency. Changing all components will increase the building’s efficiency and longevity.