A transoms is a piece of secondary glass that is usually installed above a glass shower doors. This glass panel can be stationary or movable depending on the desired function. Here are a few scenarios where a transom might be appropriate:
Floor-to-Ceiling Glass Shower Door Installation
In a perfect world, all ceilings and walls would be level. Unfortunately it is not a perfect world and rooms are rarely made with right angles and straight lines. While generally not noticeable to the naked eye, this can become a problem when trying to manufacture something that relies on an even surface, like a floor-to-ceiling glass shower enclosure. A transom can both help to bridge the gap between the glass panels and the ceiling, and also help stabilize the tall glass shower enclosure. The shower weight limit will need to be considered before installing the transom.
Pivot Door Installation
For pivot hinge shower doors that are not planned to run floor-to-ceiling, a transom can be created above the door. The mounted transom can serve to stabilize the door, as above, or as an alternative to a framed header along the top of a glass shower enclosure. Occasionally a glass shower will need a little structural help, and the easiest way to provide this is by installing a header along the top of the enclosure. However, this does somewhat mar the "frameless" glass shower look; for those that do not wish to use a header, a transom above a pivot door is an attractive alternative.
Steam Shower Vent
Steam showers run tightly from floor to ceiling in order to keep the desired steam inside the shower enclosure. The airtight glass enclosures are extremely effective, so effective in fact that a transom is often installed as a vent! This useful feature allows steam to escape when it’s time to cool down, without letting condensation drip all over the bathroom.