Hi Tim
 
I have a few of the plastic tops that came with some hives I bought from Kelley
and I have had a problem with condensation.  My solution was to prop the top up
a little with an old queen cage.  This provided adequate ventilation and solved
the problem
 
Frank
 
Hi Tim
 
I have 6 fiber glass bottoms that are about 15 years old and still
working great.  Frank, thanks for the tip on the top .  I needed it.
 
James Peterson, Ph.D.