Wedi says that the curb over cannot be penetrated. How do you suggest water sealing when you drill for glass bracket thru .incurb over .in into 2x4?

This product question/answer is for the foam over curbs. Yes you can drill on the wedi foam overs, you will want to use a urethane caulk to seal. Wedi joint sealant works but some installers like to use a clear urethane product.