There are plenty of small ventilation gaps around the eaves where the roof bars are crudely matched to the surround, but our main concern is the volume of condensation on the roof bars. The roof is 25mm polycarbonate and the glazed units are as recommended but give us water droplets at their base. There is also a horizontal line of water droplets on the upvc above the windows, which might suggest direct contact with the aluminium core. So the question we would like you to answer is: Why do the roof bars attract the condensation (the roof does not) and what can we do about it? Thank you.
Answers:
Its an insulation and ventilation problem. Easiest solution is more ventilation.
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