This document provides an overview of the design principles for the building envelope in order to achieve a high quality and energy efficient built environment. The design principles include:

—     thermal performance;

—     daylight and visual environment;

—     air quality;

—     provisions of natural and mechanical ventilation;

—     air barrier (airtightness);

—     watertightness;

—     moisture proof;

—     soundproofing;

—     sustainability and integration with technical building systems and controls.

This document is applicable to new buildings and the retrofit of existing buildings.