On Jan 20, 3:28*pm, Tabby wrote:
On Jan 20, 2:40*pm, Chris Wilson wrote:

Folks,

I plan on building reasonably large wooden shed (either with a concrete or
more likely a raised wooden floor) this summer, it's going to be a non
standard shape somewhat trapezoidal approx 26' by 16' at its widest
narrowing to around 12' at one end.

I'm more than happy with the basic design and I'm happy I have the skills
for the basic construction and so forth however I will wish to insulate the
shed so that the inside remains dry and at more or less constant (extremes
of winter excluded) temperature. If anyone's that interested I'll be
putting a model railway inside it.

My main concern is condensation or to be more precise how to avoid
condensation, if anyone could give any pointers I'd be most grateful.

Basically dehumidifier or heat. Dehumidifier is far cheaper to run.

NT

Unfortunately dehumidifiers don't work at low temperatures.
Condensation is a well known problem in sheds. Basically as the
weather warms up, the air holds more water. This condenses on anything
that's colder, especially at night as the air temp drops anyway. Large
lumps of metal are particularly suseptible, smaller ones less so. My
lathe always suffers as it's nearly a ton of cast iron.
Stationary engine enthusiasts are always moaning about condensation.
They spray everything with various oils to protect the metal. That may
not be an option for you. I'm assuming your models are relatively
small.
The only answer is to heat, and possibly duhumidify the shed. The
trouble is that's expensive.

John