| Business | Phone |
| American Slate Co 1775 Alameda St, San Francisco 94103 | (415) 864-7813 |
| Echeguren Slate Inc 1495 Illinois St, San Francisco 94107 | (415) 206-9343 |
| Gibbons Slate Roofing Co 3344 Market St, San Francisco 94114 | (415) 864-6862 |
| Premier Slate 3344 Market St, San Francisco 94114 | (415) 255-2238 |