The question arises; why not split all of them as thin as you possibly can? The solution is that these might not be sturdy enough. The strength of individual slates is a product of the rock?s strength and the slate?s thickness. A thin slate made from strong rock will be as strong as; or stronger than; a thick slate made of weak rock. The traditional thicknesses to slates within the UK own evolved so they tend to be made thick adequate to resist the loads theyll be exposed to to a roof; so that the inherently weaker rocks are split 8 at 12mm thick whereas the strongest are going to be as thin as 4mm.
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