WRC Sidewall (R&R) Shingles are increasingly being used on siding projects ranging from residential homes to architectural masterpieces. The shingles are kiln dried then re-butted and re-jointed (R&R) to ensure that they are 90° on all four corners for perfect uniform placement, finally they are packaged into boxes. Additionally, they can be pre-stained or primed, sanded as well as grooved (striated) prior to packaging in boxes.