can someone tell me the history of the random style ie. 4 ft square down to 4 inch square at the ridge!!! every time I do one I hope it will be the last they do my head in. cheers
DIMINISHING COURSES
Many types of natural slate and stone tiles come in random sizes from the quarry. Slates are graded by size and laid employing a ‘Diminishing Course’ technique which ensures greater weather fastness and an even look between courses and across the roof. The largest slates are laid at the bottom and each subsequent course is laid using increasingly smaller slates as they reach the top. This requires careful calculation and measurement before any slates are laid to ensure a consistency of finish and a sense of balance over the whole roof.
I would imagine that it was origonaly done as a way of using all of the available slate. i am doing 1200 sqm at the moment and i really enjoy it.
We have done 900 so far, a mix of old and new on different areas. All good so far the job is on a curved section of Regent St in London. Its the 2nd section like this that i have done.
and a sense of balance over the whole roof.
http://www.brandnewroofing.co.uk/technique.htm[/QUOTE] Interesting link - tho` I beat my meat and dress my lead
Random slates which are utilized in roofing installation vary in width only as they all have almost same length.
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