Improves appearance

Spacers enhance shadow lines, adding textural value without the weight and cost of thicker slate. And spacers diminish the conspicuous "gap-no gap" appearance that is created by adjacent slates of differing thickness.

The broad design of the spacer and the slight 1.2 mm (less than 1/16") gap it creates reduce roofing slate breakage and preserve the roof's water-shedding integrity.