When building the nest, sociable weavers use different materials for different purposes. Large twigs form the roof of the nest, dry grasses create the separate chambers, and sharp spikes of straw protect the entrance tunnels from predators. Nesting chambers are lined from top to bottom with soft plant material, fur, cotton, and fluff.
A proper nesting tree should have a long, smooth trunk and high branches to discourage slithering predators such as Cape cobras and boomslangs, a type of tree snake. For some sociable weavers in Africa, the perfect nest-building tree has become a utility or telephone pole. Weaver nests need constant care because of the nature of the materials used. Weavers have to continually add more material to keep the nest intact.