Thank you for your considerate words, it is encouraging to get this sort of feedback.
Although we do try our hardest to provide the best possible service, we are often left in the dark regarding the outcome, having to imagine that everyone is satisfied unless we hear differently.
In the long term, the flap generally plays an important part: As air passes over a duo-pitched roof, various pressures bear on different parts of it; either negative wind loads or positive wind loads. The flap closes off if high winds threaten on the negative load sides, readjusting automatically as things calm down.
The flap also acts as a kind of splash-board to better distribute the airflow, as well as acting as yet another defence against incoming contamination. But, they can be left off if found to be a bit excessive in a tight area, or if it is thought unnecessary in a sound, high spec roof.
There was once a question about the possibility of the flaps clacking about under a sealed off area in an extremely breezy location. The advise was to judiciously apply a couple of thin strips of draught excluder as a dampeners - that was about 10 years ago, on a high profile job, and there has never been any come back since, from anywhere.
The only other flap incidence was in another windy location, on a very low pitched roof, where one particular flap became dislodged during fierce winds. So a clout nail was placed in the hole provided on the tongue bracket, which kept it in place.
Hope this helps if not please do get back.
Once again thank you for your most welcome response, it is very much appreciated.
Ridgewatch
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