 They are often installed over kitchen sinks or in other areas where floor space may be limited or blocked; they can be used to hide architectural flaws and windows placed at different heights; when using blinds, shades, and shutters, valances are often used to soften the windows or to tie in the fabrics of corresponding furniture such as couches and recliners.Valances can be manufactured with any type of fabric, but most are made of jacquard, silk, faux silk, poly/cotton, linen, satin, velvet and polyester.Many are lined with an extra piece of fabric sewn on the back to prevent the solar radiation from damaging the fabric.