No, Securock® Roof Boards will cut with ordinary utility knifes using a score an snap method. For thicker boards like Securock 1/2" Gypsum-Fiber, two scores will be necessary. For 5/8" Securock Gypsum-Fiber a tool such as a circular saw will be necessary. It is highly recommended that a wet or dry vacuum be attached to the circular saw to reduce the dust and that the person cutting Securock Roof Boards and those in the vicinity of the cut wear a NIOSH approved dust mask.