Steam showers: The modern-day steam shower came about in the 1960s and grew in popularity for many years until its popularity fell off for a spell. Now the steam shower is the hottest trend I see in shower construction. Over the past 20 years, better vaporproofing technology has emerged, making the management of moisture much easier.
Tip: The lower the permeability rating a vaporproofing material has, the better it is. High-use commercial steam showers in Canada require a minimum permeability rating of 0.5, as tested by the American Society for Testing and Materials. Use this standard as your base requirement when purchasing a vaporproofing material and make sure you specify it when working with your professional.
If you're planning on a steam shower for three or more people, make sure you fit the right steam generator to the space. You don't want to oversize these showers to the point where they don't perform well. You may need to adjust the size of your shower to accommodate the volume of steam your unit can produce.
You'll get a touch more steam and heat on the top level of a two-tiered bench.