An Exterior Insulation Finishing System (EIFS), also known as EWI or External Thermal Insulation Composite Systems (ETICS), is a cladding system that combines insulation, weather protection, and an exterior finish into one integrated solution. Applied to exterior walls, EIFS improves energy efficiency by creating a continuous thermal envelope and providing effective waterproofing. A durable, decorative protective coating completes the system, making it suitable for most construction types.

In the construction industry, several types of EIFS / ETICS are in use. To begin with, the most basic and widely adopted system is the barrier EIFS / ETICS, also known as traditional or conventional EIFS / ETICS. Specifically, installers apply this system directly to solid substrates such as brickwork, blockwork, and precast concrete panels. Meanwhile, another common option is EIFS / ETICS with drainage, which builds on the barrier system by incorporating a dedicated water-drainage layer. Consequently, designers primarily specify this version for wood-frame structures, because effective moisture management is essential. Moreover, this drainage system helps prevent water-related damage and improves the long-term durability of the facade.