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Understood. forgive me for trying to help.

The lead valley with no lay boards is my favourite, and the dryfix ridge with dentil slips is good too. :roll: :lol:

A collection of bad roofing pics that we see on a daily basis in our office.

"breathable" underlays are good but not magical. They will allow a certain amount of moisture through but not a lot. The secret to eliminating condensation in your roof is to stop the warm moist air getting into the loft in the first place. Flush mounted cieling lights, poorly fitting loft...

Contact Klober who do various vents. They will also tell you at what centres you need to place them at. youll need the equivalent of a 10 mm gap at low level in a cold roof. 25 mm gap on a warm roof if no vapour control layer is in place 5 mm at high level for both if required. :D

Red vent eaves vent by redland is the stuff to use.