ideal conditions for car storage
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Originally Posted by MUSSBERGER
I read 70 degrees and 40-50 relative humidity.
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Humidity in my heated garage (kept around 55*F on the average throughout the winter) is around 20% max...or lower depending on how cold it is outside. I'm in a desert environ, ya' know? Not much chance of condensation happening to worry about corrosion. As far as external rubber stuff, just do a good wash/wax and apply a good protectant prior to the long sleep. Full tank of gas with stabilizer added, good to go next spring.
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20% humidity seems really low...do you de-humidify your garage? Where I am in Colorado, 30-35 % is average in an unheated insulated garage. I've had no issues with humidity with my Porsches and no moisture/rust issues but of course I don't put them away wet. I do treat the interior leather every year but they are also in an amazing state of preservation due to my climate. I have remote temp/humidity sensors in my garages so you can monitor day-to-day. When it rains/snows, humidity can reach up to 40% inside but that is still low with no moisture issues.
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20% humidity seems really low...do you de-humidify your garage? Where I am in Colorado, 30-35 % is average in an unheated insulated garage. I've had no issues with humidity with my Porsches and no moisture/rust issues but of course I don't put them away wet. I do treat the interior leather every year but they are also in an amazing state of preservation due to my climate. I have remote temp/humidity sensors in my garages so you can monitor day-to-day. When it rains/snows, humidity can reach up to 40% inside but that is still low with no moisture issues.
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In other words: Coastal southern california :-)
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30-40% is probably fine for cars, but very low humidity (anything <30%) isn't good for all kinds of non-metallic materials like rubber, leather, certain adhesives, etc. In general low humidity is good for metal at preventing corrosion, though keep in mind the boneyard is mainly focused on preserving the aluminum but not necessarily other materials in those aircraft.
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A fair question. I just checked my weather station: 27*F outside and it's 21/49% humidity outside/inside. I don't have a humidity sensor in my garage but would guess it's probably somewhere in between the outside and inside readings so yeah.....I may have understated the actual that my car's stored in. I'll put a gauge down there and report back.
I keep the garage heated all winter, usually around 55* to 60* so I suspect the humidity stays rather constant, consistent though lower than the house itself. Again, I''m in a very dry climate but the normal house humidity is what keeps the garage in check. Is it ideal......hell if I know, but it's what I've got.
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An acquaintance of mine, who buys and sells higher end Porsche collectibles (Gmund, 550s, 90Xs, etc) keeps many of his cars in the climate controlled plastic bags, such as those from https://www.carcoon.com/