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condensation on grp rooflights?

How can I cure condensation from forming on grp rooflights?
This is a newly built workshop and after several weeks using a dehumidifier the problem hasn't been solved.
Paul Anderson, October 2008
Rooflights = cold
Air inside = warm & moist

Keep inside air away from cold rooflights - try clingfilm first it's cheaper - if works consider sheet of perspex as a form of double glazing.

Bucko, October 2008