"Alex" wrote in message
om...
Does anybody have any
suggestions on how to build these doors so that the frosting does not
occur? They are frame and panel doors and I originally suggested that
he make the front and back sides relatively thin and make a center
frame that would hold some type of foam insulation.

Construction methods won't alter the thermal conductivity of the wood. It
can change the characteristics of the assembly though. Insulation as you
suggest (even an air gap) would help. Making a hollow core with panels on
the outside would work but the style may be kind of clunky looking. Is he
getting frost at the thicker section of wood also? Only sure way to
eliminate it entirely is to make a layered assembly.