i don’t know anybody in particular that is a roofer but our neighbor across the street knows of a guy i do believe . i’ll check in with him to get a name and contact info. I also live in brentwood on munsey ave which runs parallel to marylea. i’m right next to the borough building. anyhow our roof is also slate and was redone a few years back and i have some small sized slate rock in the back yard…it maybe what you’re looking for and you can have it if it makes the job a little cheaper.