Hi a little professional advice would be great. when fitting a new roof of large Marley flat tiles, on a semi abutting rosemary tiles, the tiles on the hidden gutter I believe require 2 mechanical fixings either by the 2 screw holes or by another type of clip or wire device, question is this a legal requirement no quibble, or is it a guide line? next when you have a hip end the tiles under the hip tiles, do they too legally require 2 mechanical fixings, finally the tiles below the ridge tiles , are they too screwed? and lastly when adding tile and a halves to the rosemary side to create the hidden gutter as they are not part of the new roof but a small modification to an existing roof, are they screwed of just hooked on.
thanks for any answers, would appreciate no guess's
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