4. To prep for the court surface, Roger laid a 6-inch-thick base of compacted gravel inside the timber walls. Then he wrapped a 4-inch perforated flexible pipe in filter fabric and laid it along the inside edge of the entire court. He capped one end and routed the other end through a hole in a timber he'd cut before he built the wall, so the pipe can drain rainwater away from the court surface. Once the pipe was set, he put down another 6-inch layer of compacted pack, a mix of gravel and stone dust.
5. He lined the exposed inner face of the walls with 1x12 composite decking screwed to the timbers.