Shingles are produced with waste paper, saturated in asphalt, to make it water proof. Their top layer is coated with adhesive salt and ceramic granules. Shingles can either be classified as organic or fibre glass depending on the base. In both instances however, they are saturated in asphalt to make them water proof. Both organic and fibre glass shingles come in either shingle or double layers. The double layer covers a wider area compared to the single layer.