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.

--

All the best,

Chris

Most moisture is likely to arise from the floor. Concrete is OK but
you need t have a damp proof membrane in it. I would consider putting
your locos & any portable electric bits in a cabinet with it's own
chemical dehumidfier.
With the shed as well as insulation, you need to consider one of two
options ventilation, or alternatively, seal it up tight and a
dehumidifier. Permenent heat would be an expensive option unless you
can tap in off your home central heating.