I have a 1950's home with a brick veneer and a crawlspace. The flashing that routes water from behind the veneer to the weep holes has broken in spots over time due to the weight of the trash mortar that cured on top of it. The breaks allow moisture to enter the crawlspace around the foundation. It also allows rodents to access the wall cavity and gain access to the attic. The flashing appears to be made of a black felt-like band. How can I repair this? I was considering expanding foam but I'm afraid that may defeat the weep hole system.