Fiber mesh won't need any overlap due to way that it's distributed from the concrete throughout the pour. Micro fibers have a diameter which is fewer than 0.3 mm. Micro fibers are both monofilament or fibrillated. Micro fibers need to be used for plastic shrinkage Management (cracking which can happen https://www.qunkunmetal.com/wire-mesh/concrete-reinforcing-mesh.html