i want to install hardwood flooring in my powder rm and a new toilet . before i do that i would like to know if new toilet tanks sweat. can this sweating be avoided ? or would tile flooring be the way to go? my old toilet had a rubber lineing on inside of tank and there was no sweating until it deteriorated. im not sure if new toilets have this lining.
thank you for responding.

You can purchase a new tank with an insulated lining to keep it from sweating.

also if you have an exhaust fan ,keep it on when someone is showering.the more moist,hot air you can remove,the more you help yourself out...hot air+cold china=condensation :-(

install a tempering valve on the cold water supply going to the toilet in the basement.

I have a 3.5 gallon toilet in my bathroom. It sweat a lot because of the shower. I bought an insulation kit. It works "the nuts" as packy sez. It's just thin styrofoam that you cut to fit, then glue in with some kind of caulk they give you.

Cheers, Jeff.

where u get. is it a big box store item or plumbing house and what do you call it?

You can get one at a box store. Its called a toilet tank insulation kit.

If you don't mind a slighly noisy flushing toilet then seriously consider a pressure assist toilet. No water in the tank means no sweating.

Plumbermandan