Collyweston Slates are from the hard
micaceous limestone beds of Northamptonshire, Lincolnshire, Rutland and
Cambridgeshire. Collyweston Slates are more regular in shape, smoother in
texture and lighter in weight than Cotswold slates with a fairly constant
thickness of 3/8 in (9mm) and an average weight of just over half a tonne per
square. Colours are cream and grey. Average pitch of roof is 48 degrees. These
slates are bedded in lime mortar unlike other stone slates.
(Craft Techniques for Traditional Buildings:
Adela Wright)
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