Edge beads are designed to finish edges on plasterboard and panels used internally. They butt up to the edge of the board or panel and provide a lip for skimming to give a sealed, clean, straight and finished edge.

EIFS is short for Exterior Insulation and Finishing Systems. These are complete systems often comprising of several materials, layers or proprietory products that finish and insulate external walls. 

Elastomeric coating is sually an acrylic or pliolite based external wall covering such as a thin coat render or paint that makes a decorative, flexible and waterproof coating.

EWI is short for External Wall Insulation. A term usially given to complete insulation systems created by manufacturers of wall insulation products. But the term can also be applied to external wall coveings such as render.

An expansion bead is a bead designed to bridge two surfaces at a gap or joint that expands and contracts in line with the expansion and contraction of a construction preventing such movement from cracking any finish applied to the surfaces.

The external curtain of a building are the external walls that form the building's perimiter.