Senusret II
The pyramid was built around a framework of limestone radial arms, similar to the framework used by Senusret I. Instead of using an infill of stones, mud and mortar, Senusret II used an infill of mud bricks before cladding the structure with a layer of limestone veneer. The outer cladding stones were locked together using dovetail inserts, some of which still remain. A trench was dug around the central core that was filled with stones to act as a French Drain. The limestone cladding stood in this drain, indicating that Senusret II was concerned with water damage.