Porto Slate Importers (PSI) has exclusive import rights to the highest quality black slate available in the world from Valongo, Portugal. For 50 years, black slate from the Valongo region, in the district of Porto has best been known for its durability, dramatic appearance, and is the premier choice among architects, builders, contractors, and homeowners.
VALONGO BLACKTM slate has added qualities in all applications, because it is, among all natural stones the one which measures the best flexural strength making best suited for counter tops, building stone, roofing, sinks, monuments, pool coping, sills, ornamental stone, interior, exterior, walls, floors, paving, firewall and many other design projects.
