From today’s inspection. It’s the first time I have ever seen asphalt shingles installed over slate.
As you can see, it really did not work out to well. Along with a lot of missing & loose asphalt shingles and an exorbitant amount of nail pops, the asphalt shingles were cupping.
I would not think a competent roofer would even try this.
I’m just looking for some input.