Window Leaks due to Wind-Driven Rain
I have been living in a new construction condo unit since November 2021. Two of my windows facing south tend to leak during storms. The builder came out and attempted to fix the leak problem four times by caulking the affected windows and adding new flashing tapes around them, but it never solved the problem completely. I suspect the rainwater penetrates the exterior wall somewhere else.
Attached are two pictures showing where the leaks are. The water seeps through the line where the window head jamb meets the head jamb extension. I hope these are the right terms to use.
The sheathing is covered by regular vinyl siding and Tyvek housewrap, which is not water-resistive. The builder suggested replacing Tyvek with Ice & Water Shield on the entire wall, and a third-party contractor suggested using Henry Blueskin instead of Tyvek. Do you think these are good solutions?
I found out that damages caused by wind-driven rain are usually not covered by property insurances. Is it typical to construct buildings in a way that they can withstand wind-driven rain? I just wonder if I can actually hold the builder accountable for the leak problem.
Honestly, I don’t know what the actual root cause is. I was making guesses based on my own research and what I learned from the builder and contractors. What can be done to identify the root cause? Is it necessary to remove the siding and housewrap and trace any water marks on the sheathing?
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