The role of pelmets or an equivalent structure is often overlooked in effective window coverings. Having a physical block or seal at the top of curtains prevents or slows convection currents establishing in the room. As the air behind a curtain cools as the heat passes through the window, the sair will sink, usually to floor level (opposite to hot air rising). Air is pulled in to replace this air, and usually the easiest route is from the top of the curtain. Unfortunately this is also the warmest air in the room (hot air rising again). Convection currents can strip a room of its heat adding significantly to heating costs. Pelmets block or slow the  drawing of the warmest air behind the curtain.

Box pelmet. This is the classic pelmet, constructed out of timber and attached to top architrave, concelaing the curtain top and rail. Many classic pelmets are padded and decorated. Unfortunately many decorated pelmets are for aethetics and are not sealed at the top. If this is the case of existing pelmets, explore ways of enclosing the pelmet.

Ledge pelmets. An easier and cheaper option to the box pelmet is to block the gap between the curtain rail and the architrave. Any material can be used, but we have found cardboard or flute board to be very effective. The distance between the wall and the outer edge of the curtain rail is measured  and strips of chosen material are cut to this width. The strips are attached to the architrave with blutac, double sided stickytape or pins while

the other side can simply rest on the curtain rail.

Coreflute or fluteboard can be purchased from Bunnings (600 x 900mm boards) or in larger sheets from plastic manufacturer such as Associated Plastics Tasmania.