Holes in the underlay membrane

We are currently having a house built. The roof was not fully boarded with wood, but according to the construction description, a highly vapor-permeable, waterproof underlay membrane was installed on the rafters. It is a green foil. During the roofing, this foil was punctured because, according to the roofer, the lift got jammed and a tile fell. We have raised the issue several times. Each time, we were assured that all holes were sealed with a special adhesive. Has anyone had experience with this problem? We are now afraid that the foil is not watertight and water can penetrate. That would cause greater damage since the entire insulation of the drywall would get soaked. It probably takes longer to notice such a thing. Who can assure us with certainty that the foil is really watertight?

Hello!! I think it is a construction defect and that it definitely needs to be replaced. Sure, you can glue everything, but whether it will last many years, well... Certainly, it will be concealed by gluing; it will hold at this moment or for years, but you will probably have the roof structure for a lifetime. Maybe there is the possibility to cover it extensively with a new underlay membrane and then weld the seams... But maybe you could inquire with another roofing company or master builder to see what they say about it.... Regards.