Looks like you had a duplicate post so I deleted the other one. Just fyi.

I think it depends on how much moisture you get. If it is enough to cause the plywood to splinter or break apart, I'd worry about the wood falling on the car on damaging it. I may not have the right mental picture of what your parking area looks like though.

 

Live in michigan and winters are hard. Was considering capping the area where the car is parked to keep the cement moisture off the car while shes sleep during the winter.
Good idea? Worth it?

What is “capping?” Are you talking about parking the car on plywood?

 

Yes just lay the plywood sheets on the ground. Somehow keep them together.

We live on the water and the water table is high. Cement floor in garage starts to collect a sheen of condensation in early spring.

 

Is there any concern for mold under the plywood?

I see you have a window in your garage... I run the largest 110 window AC unit I could get in my 3-car garage during the warm months here. With the Texas heat and hot engines, my house garage would get crazy warm. The AC unit keeps it comfortable and dry! Another option would be a dehumidifier, but they add heat to the room.

Have you looked into sealing your floor? That might cut down on the moisture as well.

 

Mold concern is good point. I run a natural gas 60m BTU radiant heater all winter. Temps never below 45 deg. Stilll as it gets warm and humid rapidly and surfaces are lower than the dew point condensation can form.

 

Ok I was way off!! I thought u were talking about a concrete ceiling where water condensed and drips down. My mind went there because we have that phenomenon in the parking deck at work during the winter and spring when the temps fluctuate.


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It sound like it is time for a de-humidifier.

 

I doubt plywood will help that much. The plywood would wick the moisture, but you can buy OSB board with the attached vapor barrier. That would probably be the way to go.

The best option would be to run drain tile around the outside of your building and get the water away, but that pretty labor intensive and expensive if you don't do it yourself.