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As early as the early 1600's in the United States, slate was imported from Europe, most of it coming from Wales in the United Kingdom.  With these imports also came the highly skilled laborers needed to install slate shingles.
As might be expected, the weight of slate needs to be taken into account.  The structure of the roof will need to support loads ranging anywhere from 700 pounds per square to as much as 8,000 pounds per square. Textural Slate Roof - slate shingles of various thicknesses placed in a random pattern throughout the roof.
The most common use of slate is to provide protection from the natural elements as a roofing material.  Other uses of slate include applications for interior and exterior flooring, stairs, walkways, wall tiles and gravestones.
ASTM C 406, "Standard Specifications for Roofing Slate" describes the three grades of roofing slate.
Exposure and appearance - That portion of the slate shingle that is not covered by the course above it.  The correct exposure is obtained by subtracting the 3 inch headlap from the total length of the shingle then dividing that number by two.
Flashings and penetrations - These are critical to the success of the slate shingle roofing system.

The Buildipedia research and writing staff consists of dozens of experienced professionals from many sectors of the industry, including architects, designers, contractors, and engineers.
Timberline HD® Shingles will not only protect your most valuable asset but also beautify your home for years to come. If the roof of your house has complex shape like the one in the right, the most accurate way is to measure all the dimensions and add the areas of all surfaces.
A square in roofing terms is defined as a sufficient number of slate shingles of any size to cover 100 square feet of plain roofing surface, when laid with the approved or customary standard headlap of 3 inches.
Also, slate shingles with rougher surface and uneven tails can create a textural slate roof system. However, when using slate tiles as a flooring material, the floor can become slippery when subjected to rain or moisture.  Slate has also been used been used for laboratory countertops, for billiard tables, and as blackboards in schools. This fine grained material was originally composed of clay or volcanic ash in prehistoric ocean beds.

The most common roof materials in the United States are shingles, membrane roofing, ceramic tile, etc.
However, by the early 20th century, slate had begun to give way to new roofing materials, such as the asphalt and asbestos shingle. If the house is irregular in shape, you can divide the house covered area into a few simple shapes and add their area together. Because of the natural way in which slate can be split along its planer axis and yet still maintain its integrity, slate has been adapted very well to the building industry.

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