Grades Of Roofing Slate

Welsh slate still comes in 3 grades referred to as capital 5 5mm thick county 7 mm thick and celtic 9 mm thick. According to astm test c 406 roofing slate falls into three grades of classifications. Greenstone slate is measured by eye to thickness and is then split by hand.

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Grade s1 slate has an expected service life of more than 75 years.

Grades of roofing slate.

This further highlights the traditional regional variations. Grade s2 slate s service life is 40 to 75 years. Roofing slates are rated through the american standards of testing and materials and given a slate classification from s 1 to s 3. But the finished project will look as good if due care is taken of the slate grading.

Slate from cupa 5 and 18 quarries have more of a textured finish. S 1 will provide a service life of over 75 years s 2 will provide a service life of 40 75 years. Welsh slate being very flat and smooth as well as a nominal 5mm thickness. Slate grades are intended as a prediction of the slates expected service life.

Grade s3 slate has an expected service life of only 20 to 40 years. Standard grade rough texture. A standard grade slate cupa h selection will be less uniform and will require more sorting prior to use. It is truly the result of a craftsmen s.

N is cupa s natural selection.

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