New construction here. Everything done in EMT.
Temps here have been below zero, and are currently in the teens.
Two places now I have found wetness in my metal boxes… one in the shop which is a junction box on the ceiling for most of my 220v stuff which leaked (drops) onto my TS top, and another outlet box up stairs which has actually produced a small water-spot on the OSB sub-floor right under a wall plate.
The entire upstairs has not been fully completed, so there are no outlets or conductors in many of the runs yet. So the boxes are all open to warm air, and the EMT runs up into the attic to where it is exposed to very cold air.
All of the shop EMT is similarly run… from ceiling locations up into cold air and over and down. All shop ceiling outlets are installed, but I haven’t put cover plates on yet.
The junction box which leaked onto my TS is open still (no cover-plate).
There’s no question this is condensation because it is impossible that there is something leaking into my EMT runs. The wetness is clearly apparent where EMT runs up into cold air, and then back down to its various and respective locations.
QUESTION: When I get the outlets and switches and cover plates installed, will it minimize warm air creeping up through the EMT and thus keep the condensation down?
The shop junction box… should I stick some foam in there and cover the box… then check it later? It’s still open but has not leaked of late that I can see.
What should I do to minimize the condensation?
Thank you for your attention.
Paul