Cross-section of sill construction. Inset is a typical replacement floor panel with a vertical flange on the outer edge to deal with any rot at the bottom of the inner box section. (Note: The inner edge has a similar flange to cope with any rot to the lower edge of the tunnel.)
The four drain holes to the outer sill cavity.
Nearest the camera are arrowed two of the holes in the front half of the castle section to drain the inner cavity. Three of the outer sill drain holes are arrowed furthest from the camera.
Three outer sill drain holes arrowed at the left, and on the right one of the drain holes in the rear half of the castle section.
