I believe styrofoam is required to be covered with a fire rated material such as drywall because it is a fire hazard. Produces poisonous gases during a fire so can not be exposed. You may be thinking of another type of ceiling tile that can be purchased through any home center or specialty shop.
Styrofoam is used to insulate the walls and roofs. The Styrofoam panels that are used for that are 2” or more in thickness and they passed the safety and all construction certifications. The ceiling tiles that you can find on www.styrodecor.com and www.antiqueceilings.com are between 1/6” and ½” thick and since they are made in Western Europe they had to pass very strict and rigorous tests in order to be sold and used in the European Union’s countries (including Germany, Italy, G. Britain, France, etc…). I have both ceiling tiles and polyurethane crown molding in my house. Also, all of my friends that I recommended the product loved it and there was never a concern about safety hazards. The tiles look great, just like tin but much easier to install, plus I saved enough money to splurge on a new Plasma TV :).
PS. Just found some listed on EBAY as well: http://search.ebay.com/_W0QQfgtpZ1QQfrppZ25QQsassZnxtlvl591"
03:14PM | 03/23/13
Will these tiles hold up in a bathroom with the steam from a shower