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Galvanized tin for a bathroom ceiling?




Q. We are considering installing a pressed tin ceiling [affil links] in our bathroom remodel. Is there some way to seal the metal to absolutely prevent rust? Has anyone out there lived with a tin bathroom ceiling for a number of years without a rust problem?

Thanks.

Janette Bianco
homeowner - Pleasant Mount, Pennsylvania, USA
2004


A. The trick to making sure that the tin does not start to oxidize is to make sure that it is well and fully sealed on both sides. As it is going to be in a moisture rich environment you will want to finish both sides of the tin ceiling with a protectant, talk to whoever is going to be selling you the ceiling before you make a decision.

Marc Banks
- Elizabeth City, North Carolina




Q. We are having issues with our bathroom and our ceiling has mold spots on it. We currently have drywall. We are in the process of replacing and rerouting our ceiling exhaust fan and will be replacing the entire ceiling. I like rustic decor and am considering getting galvanized tin for the tin ceiling [affil links]. Will this be OK? We already have ceramic tile surrounding our shower stall, so the tin won't be directly over the shower.

Jill Sinn
working mom - Sparta, Illinois, United States
May 25, 2010


A. Semantics, but you cannot galvanize tin as zinc melts at a higher temp than tin. "tin cans" used to be steel with a thin tin coating and are not tin. That coating has virtually been replaced by organic coatings.

With the amount of moisture from baths or showers, that area is guaranteed to rust --someday -- if you put up galvanized steel. This could be days, weeks or years, depending on the quality and the environment.

James Watts
- Navarre, Florida
May 28, 2010



A. Yes, it is semantics. People use the slang word "tin" to refer to steel sheet metal, and it can be a bit confusing. Galvanized roofing will last many years or several decades outdoors, however:

1). It is not considered failure or rusting if the coating turns brown, due to its zinc-iron nature, whereas you might consider that unacceptable.

2.) Plenty of air (carbon dioxide) is required for galvanizing to work well. Voluminous white rust (wet storage stain) results if it can't breathe and I'm not sure if the ceiling will breathe well enough. But I have read stories in handyman magazines of it being used successfully.

Today most 'tin ceiling' tiles are probably painted steel rather than galvanized, and will therefore last as long as other painted steel. Regards,

Ted Mooney, finishing.com
Ted Mooney, P.E.
Striving to live Aloha
finishing.com - Pine Beach, New Jersey
June 1, 2010




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