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 durability of individual slates is a product of the rock?s strength and slate?s thickness. A thin slate made from sturdy rock will be as strong as; or stronger than; a dense slate made of weak rock. The traditional thicknesses of slates within the UK need evolved so that they tend to be made dense enough towards resist the loads they will be subjected to upon a roof; so that the inevitably weaker rocks are split 8 inside 12mm thick whereas that strongest will be as thin as 4mm.
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