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Last edited 22 Nov 2021
The lintel is the structural member at the top of an opening such as a door opening (sometimes referred to as a doorway) that transfers the load from the structure above to the side walls of the opening.
Casings and linings can be trenched, meaning that the top rail has a slot in it into which the side rails fit. Typically trenched linings or casings are used for standard door sizes, whereas untrenched linings or casings may be used for non-standard sizes and old doors where some flexibility is required.
 Mouldings, architraves and surrounds
In its proper use, an architrave is a top moulding where the moulding extends across the top of the side mouldings. However, in the modern construction industry, the term architrave it is frequently used to refer to any horizontal or vertical mouldings that form the surround to a door.
 Ironmongery hardware and furniture
There are a range of additional components and accessories that can be added to door constructions to enable their proper operation, such as hinges, knockers, hooks, bolts, stops, finger plates, kick plates, letterboxes, closers and so on.
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