Garage moisture/condensation

[lkg907]

New construction. 900 sq ft. with 10.5 ft ceilings. Insulated panels with R-24 walls and R-38 ceilings. Eastern Wa.
I'm going with a Reznor 30,000 btu direct vent heater. Combustion air is sourced from outside the garage.
The area will be kept at maybe 35 degrees in the winter, and heated on demand when I'm out there working on a project.
I may have screwed up with the direct vent heater. With snow and such on the daily driver, there will be moisture in the garage. I'll go with waterproof primer on the drywall, and that should help a bit.
But how do I deal with the condensation when I heat up the garage? There's got to be a way to get rid of it. Other than opening up a window and running the Reznor.
Thanks in advance.

 

[e-tek]

I have the same set-up in the daily parking garage. Just insert a fan on a HumiStat switch. It'll cut in when needed (I turn mine on manually when I know it's needed - as you described above) - then it'll run until the humidity is correct (55%?).

I have yet to see any humidity gather on walls or windows...

Do you have a floor drain? Wish I did, but I don't, so I also squeejee the puddles out in the morning as well.

 

[Spencyg]

I used to have direct vent propane heat in my old shop and will NEVER do it again. I have some large cast iron machinery which would sweat all winter long, rusting the tables and ways and causing general hate and discontent. I'm finishing up my new shop currently and it will have vented propane heat.

Spence