Aeratis PVC Lap Siding is now available in 2 different reveals. 5-½ and 7-¼ . All siding boards are paint ready and come 16′ long. Just as all other Aeratis products, the new siding line was created to replicate early 1800’s real wood siding. While other manufactures work to hide imperfections in their product by adding deep wood grain, we are creating an exact replica if wood siding.