- Because windows are made in myriad sizes, consumer-grade curtain rods are designed to expand or contract to the correct size for the window on which it will be used. These rods are generally comprised of two main parts: one rod of a certain diameter (for round rods) or width (for rods of other shapes) and another, slightly smaller rod that slides inside the larger rod. Because the smaller rod can freely slide into the larger rod, it can be pushed in or pulled out to create a rod of varying length.
- Once the rod is correctly sized, it is affixed either to the top of the window frame or to the wall just above the window. The rod can be affixed in a number of ways, but the most popular mounting methods include a series of simple cupped brackets in which the rod simply rests or a set of fixed square brackets that insert into the ends of a fitted curtain rod. Regardless of the method through which the rod is supported, it securely and easily supports itself and the weight of the curtain.
- Most curtains are designed to be supported by a curtain rod; as such, they generally have either an opening running the full width of the top of the curtain into which the rod slides or a series of looped "tabs" through which the rod is placed. Once the curtain rod is inserted into the curtain, the rod is affixed to the brackets installed in Section 2 above and secured to the wall.
