• Gary Potter’s Roof in Medford Oregon

    Slate looks particularly beautiful on the large expanse of a tall roof.

  • Roof and Gables

    Custom slate mixtures can create a unique look.

  • Peaked Roof

    Pleasing architectural effects can be achieved by blending different sizes and colors of slate.

  • Multi Color Peaked Roof

    A mixture of different types of slate can create a playful visual effect.

  • Aged Roof Slate Detail

    Slate roofing tiles are still manufactured by hand using traditional methods.

  • Rounded Tower

    Slate is one of the most aesthetically pleasing and durable of all roofing materials.

  • French Chateau Roof

    Installed properly, slate roofs require relatively little maintenance and will last 75 to 150 years or longer.

  • Slate Detail

    Textural slate roofs incorporate slates of different thicknesses, uneven lower edges, and a rough texture.

  • Multi Gables

    When struck, high-grade slate tile will emit a clear, solid sound. Severely weathered slates give off a dull thud when tapped.

  • French Style Roof with Round Tower

    A very traditional roofing material, slate should be laid by roofers of experience and training.

  • Contemporary house with fan-like roof.

    Contemporary architecture can also benefit from the aesthetic elegance and structural integrity that slate brings to a project.

  • Slate work by Natural Slate Roofing. Building is the Jean Gray Hargrove Music Library at UC Berkeley.

    Slate can be cut in unique shapes and used to clad a building in stone.

  • Slate Detail

    Visible bands on the surface of slate represent geologic periods.

  • Steep Gray Roof with Brick Chimney

    Slates are classified as fading or unfading according to their color stability.

  • Steep Dark Roof with Subtle Varigation

    Slate is a fine-grained, crystalline rock derived from sediments of clay and fine silt which were deposited on ancient sea bottoms.

  • Varied Texture Roof Over a Brick Facade and Chimney

    Slate is created by movements in the earth’s crust and the resulting heat and pressure.

  • Black Roof

    The presence of carbonaceous matter, derived from the decay of marine organisms on ancient sea floors, gives rise to the black colored slates.

  • Bay Landing Hotel

    Black slates get their color from carbon matter – the ancient remains of marine organisms on the sea floor.

  • Steep Tudor Style Roof

    Slate consists of stable, weather-resistant minerals and is generally of high strength, low porosity, and low absorption.

  • Multi Color Roof

    Slate is composed of clay and mud that changed over time into stone, with inclusions of quartz, mica, and chlorite.


California Slate Company, Inc.

3344 Market Street
San Francisco, CA 94114
+1 (888) 994-0842

We sell roofing materials made from natural slate.

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Enhance the beauty of your home with a custom-designed slate roof from California Slate Company. Founded in 2006, we focus solely on high-quality roofing slate and the needs of homeowners, architects, and contractors. With more than 31 years of experience in the industry and a detailed knowledge of our products and their application, we deliver unparalleled service and expertise.

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As the premier resource for quality natural slate in the United States, we carry a wide selection of materials, many exclusive to us. Our large inventory helps reduce wait times, so your project can begin more quickly — and our long-standing relationships with the best slate producers around the world allow us to serve customers not only on the West Coast, but across the country.

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Why Slate?

As durable as it is distinctive, slate is the most stable, longest lasting material you can put on your roof. Created by natural forces over millions of years, it’s abundant, fire resistant, and environmentally friendly — not to mention beautiful.


Lightweight Roofing System

SLATE2 is a modern take on a traditional slate roof. An elegant merger between modern and traditional technologies, SLATE2 can reduce the weight of a traditional slate roof by 40%, bringing it under 6 lbs. per square foot which meets standard structural roof specifications. Accordingly, SLATE2 allows most homes to acquire the elegance of a traditional slate roof without requiring structural upgrades.

Illustration of SLATE2 Installation with Tiles and Underlayment

Benefits at a Glance:

  • Lighter
  • Cheaper
  • Greener
  • Classier
Lightweight Roof
  • The Western States Roofing Contractors Association
  • Slate Roofing Contractors Association
  • National Slate Association Member
  • Globes Illustration Showing Slate Source Locations