What causes moisture inside a garden metal shed? Does this mean i have a leak? ?

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The moisture is all over the inside of the shed, even in a not so cold night. If there is a leak what's the best way of repairing it? Pls. help, thanks.
 
You likely do not have a leak. During a sunny day the sun warms the shed and the air inside of it. Warm air acts like a sponge to soak up moisture from wherever it can find it: damp gardening gloves, damp potting soil, wet grass on the mower deck, garden soil on your boots and tools stored without cleaning them.

Over night, the air temperature drops and the walls of the metal shed drops even more as it radiates heat to the night sky. Cool air cannot hold nearly as much moisture as warm air and the air next to the metal walls gets chilled most. It gives up its excess moisture to the walls of the shed as condensation. Metal tools in the shed will also attract condensation, which is why metal tools rust in an unheated shed.

You can alleviate this problem somewhat by ventilating your shed so that the air heats up less in the daytime and cooler, dryer air is drawn in toward evening, Simple gable vents on each end will help and a small surplus fan blowing out one end will work wonders. Such fans are sometimes taken from old computer equipment and sold at stores like Princess Auto in Canada or various surplus stores in the US.
 
You likely do not have a leak. During a sunny day the sun warms the shed and the air inside of it. Warm air acts like a sponge to soak up moisture from wherever it can find it: damp gardening gloves, damp potting soil, wet grass on the mower deck, garden soil on your boots and tools stored without cleaning them.

Over night, the air temperature drops and the walls of the metal shed drops even more as it radiates heat to the night sky. Cool air cannot hold nearly as much moisture as warm air and the air next to the metal walls gets chilled most. It gives up its excess moisture to the walls of the shed as condensation. Metal tools in the shed will also attract condensation, which is why metal tools rust in an unheated shed.

You can alleviate this problem somewhat by ventilating your shed so that the air heats up less in the daytime and cooler, dryer air is drawn in toward evening, Simple gable vents on each end will help and a small surplus fan blowing out one end will work wonders. Such fans are sometimes taken from old computer equipment and sold at stores like Princess Auto in Canada or various surplus stores in the US.
 
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