Refinishing stairs refers to the process of restoring or renewing the appearance of existing staircase components. This typically involves sanding down the existing finish, repairing any damage or imperfections, and applying new stain, paint, or protective coatings to give the stairs a fresh, updated look. Refinishing stairs can include tasks such as stripping off old finishes, sanding the wood surfaces, filling in cracks or gaps, applying new stain or paint, and adding a protective topcoat. The goal is to enhance the aesthetics of the stairs while also improving their durability and longevity. 

Recapping stairs in construction refers to the process of applying new or additional material (called a "cap" or "recap") over the existing treads and risers of a staircase. This is done to update the appearance of the stairs or to repair damaged or worn-out steps. The recapping material can be made of various materials such as wood, laminate, or engineered materials. It provides a fresh and durable surface while avoiding the need for completely rebuilding the entire staircase structure. 

In construction, the term "installation flooring" typically refers to the process of laying down and securing flooring materials within a building or structure. It involves preparing the subfloor, which may include leveling or smoothing it out, and then installing the chosen flooring material. This could include hardwood, laminate, vinyl, tile, carpet, or other types of flooring. The installation process may vary depending on the specific material being used, but generally involves measuring, cutting, and securing the flooring pieces to create a finished and functional surface for walking or other activities.