How thick is roofing slate?
Standard thickness roofing slate is usually defined to be 1/4″ nominal thickness or about 3/16″ – 5/16″. The experienced eye of the splitter is the primary thickness gauge, and thus that 1/4″ thickness will usually vary by at least 1/16″ in either direction. It’s not unusual for a roof design to call for slates that are thicker than standard production such as 3/8″ – 1/2″, 1/2″ – 3/4″ or even 3/4″ – 1″ or more. As you might guess, slate which is two or three times thicker than standard will usually be significantly more expensive.
