Grades Of Roofing Slate

Slate from cupa 5 and 18 quarries have more of a textured finish.

Grades of roofing slate.

Grade s1 slate has an expected service life of more than 75 years. Greenstone slate is measured by eye to thickness and is then split by hand. Grade s2 slate s service life is 40 to 75 years. Grade s3 slate has an expected service life of only 20 to 40 years.

Standard grade rough texture. S 1 will provide a service life of over 75 years s 2 will provide a service life of 40 75 years. This further highlights the traditional regional variations. It is truly the result of a craftsmen s.

N is cupa s natural selection. According to astm test c 406 roofing slate falls into three grades of classifications. A standard grade slate cupa h selection will be less uniform and will require more sorting prior to use. Slate grades are intended as a prediction of the slates expected service life.

But the finished project will look as good if due care is taken of the slate grading.