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Roofing Slate Thickness

Posted By On 2 Aug 2017

The most common thickness is ¼” and weighs approximately 935 pounds per square when installed with a 3” headlap.  Some quarries such as Glendyne, which produces our North Country Unfading Black slate can be split consistently and sold 3/16”, ¼”, 3/8” and ½”.

Light weight roofing slate, 3/16" thick North Country Unfading Black
North Country Unfading Black slate, 3/16″

When selecting a slate thickness, there are a few things you should consider such as the weight per square.  A 3/16” thick slate weighs approximately 700 pounds per square whereas a ½” thick slate weighs approximately 1870 pounds per square.  Thicker slates are also more expensive and have more texture to the face of the slate.

North Country Unfading Black slate, 1/4" thick roofing slate
North Country Unfading Black slate 1/4″

When ordering the various slate thicknesses a 3/16” is called “Standards”, ¼” is “quarters”, 3/8” is “Heavies” and ½” is “extra heavies.

Heavy North Country Unfading Black roofing slate 3/8" thickness
North Country Unfading Black slate 3/8″

When a roof has several slate thicknesses installed, this is called a graduated slate roof.  The thicker slates are installed at the eave and the thinner slates at the ridge.



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