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So I would assume so. My limited understanding is that would be essentially mandatory for a new build house and is the reason the weep holes are there. I can't tell how to tell whether its working or installed correctly, or whether the flashing could be defective though. Any advice appreciated

Hi all - apologies in this is the wrong forum - happy to move where needed We have a new-ish build home - around 4 years old now so under NHCB's warranty rather than the original builders. A couple of weeks ago we noticed water ingress that must be coming from the joints between the bay window...