How much overlap should WWM (Welded Wire Mesh) have when lapped?

When lapping Welded Wire Mesh (WWM), it is vital to ensure proper overlap to maintain the structural integrity of the reinforcement in concrete. The recommended overlap is typically specified as the stay (the distance between wire intersections) plus an additional amount to ensure that the wires properly interconnect, providing adequate strength and load distribution.

In this context, "stay" refers to the spacing between the wires, and adding 2 units to this value ensures that the overlap sufficiently accommodates bending and shear forces. This overlap also helps in bond development between the concrete and the mesh, enhancing the overall performance of the concrete structure.

Using Stay + 2 as the overlap value ensures that there is enough coverage without excessive material waste, which is both efficient and effective for structural applications. This practice reflects standard industry guidelines and is a best practice among contractors and engineers involved in concrete reinforcement design.