Also known as R&R products, these materials have the same specifications as Number 1 and Number 2 Certigrade® shingles, but they are machine re-trimmed for parallel edges and with smooth butts sawn at right angles where a uniform appearance is desired. They are primarily used for sidewall applications. Rebutted & rejointed shingles are also available with a smooth sanded face, with the length of the sanded face at a length greater than the maximum exposure.They are manufactured from 16", 18" and 24" lengths. R&R products are for sidewall applications only.