Glue is recommended to improve stiffness of connections and to eliminate squeaks. Apply a construction adhesive meeting APA Performance Specifications AFG-01 or ASTM D3498 to all joints, with particular attention to the connection at the back riser. Regardless of where glue is used, nail all edges of treads (as indicated in diagram). Detail A is the simplest system, but Detail B is referred since it eliminates end-grain nailing at the back riser.
To prevent excessive wear, bull-nosed treads should be covered by a finish flooring material, such as carpet and pad. Additional application guidelines may be appropriate for special installation finishes, including resilient flooring and ceramic tiles. Follow manufacturer recommendations.
Always follow the local building code or designer’s specification for installation requirements.