metal sheds

[peglegs]

i have a 10 x 10 metal shed that i really could use for storage but here in the n/w there is a constant moisture build up on the inside of the roof im not sure if its coming from the ground or just condensation from outside to inside temperature differences but in any case it "rains" inside. it was suggested to use spray foam to eliminate the tempersture variations at the roof level also i would like to build a wood deck to set it on and thought this would help.
did anyone rectify this with there shed? whats your thoughts, these come up frequently on c.l. either free or cheap in decent shape. thanks