Air barriers and attic ventilation such as soffit vents, ridge vents, and gable vents help control air leakage and moisture in buildings to improve energy efficiency and extend the life of roofs. A backhoe is construction equipment used for small excavations, while a front end loader is similar but larger and does not have a back bucket. Various framing elements like studs, plates, joists, sheathing, and rafters are used to construct buildings.