Unfading slates more or less maintain their original color on the roof. It is important to note that in many cases, and in current usage, the terms “unfading” and “non-weathering” and “fading” and “weathering” are often used interchangeably. Slate can be known as “weathering” and “non-weathering”, or “fading” and “non-fading”. There are two color adjectives that have been used in the roofing slate industry that explain the change of color known as weathering and fading. In order to obtain the best blending of these colors, contractors should draw from several pallets at the same time when taking slate to the roof for installation. These color variations should be expected.
One of the unique and aesthetic advantages of natural roofing slate is the subtle variation in color, shade, veining, and grain of each individual slate shingle on a roof. Chlorite produces green slate, hematite the purples, carbon the grays and blacks, and hematite and iron oxide the reds.ĭescriptions of color can vary widely from supplier to supplier, but generally, roofing slate produced in North America falls under the general color descriptions of black, gray/black, gray, green, gray/green, purple, variegated purple, mottled purple/green, and red. The color of a natural slate is derived from its chemical and mineral composition. Slate Colors and Slate Weathering Designations Natural slate has many uses which include roofing material, floor tile, countertops, wall cladding, blackboards, and even tub and shower enclosures. As a result, the sedimentary bedding plains of the original clay and shale are totally independent of the metamorphic grain of the resultant slate bed. Sediments accumulated on the sea floor were exposed to extreme pressures which lead to the chemical and mineralogical transformations you see today. During later geological upheaval, these sedimentary shale beds were lifted from the ocean floor, folded, and buried on the North American continent. These sediments accumulated on the sea floor for 150 million years, forming a bed of clay and shale several thousand feet thick. Natural slate is a microcrystalline, fine grained metamorphic rock formed 400 million to 550 million years ago, with its beginnings as sedimentary silt washed into ancient seas.
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