THere is nothing wrong with puttting a layout in a shed. Your bigger problems will be 1}expansion and contraction and warpage of track, 2} humidity and corosion, 3} dust and dirt everywhere,
However, as one commentor on another forum said {about an una/c'd unheated garage that was unfinished: "why would you spend up to thousands of dollars {And building framework, track, scenery, locos and trains can cost that much} and put it in a room unihabitable to humans to get ruined?" He also mentinoned that "could
YOU stand to operate your loco in that type of climate?" {teens in the winter and 90's in the summer?}
Here are some tips:
First, I would suggest, spend a little money and insulate your shed, add some vapor barrier sheet plastic and some sheet rock elsewise dust and dirt may take over your layout.
Then, if there is a window, a window a/c {about $100} will help keep things cool in the summer. if not, have a through teh wall a/c installed may cost a bit more. Even set on lower temps it will be better than not.
Then invest in a dehumidifier to keep down humidity as well..be sure to empty 2 times a day or more.
THen, get a small wall heater {they shoud sell them where you live} and have it installed...they work on Nat. gas or Propane to keep temp at min 50 degrees in the winter, higher when you want to play.
Just some sound advice and opinions. others may vary,
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