typically screwed or nailed to rafters known as lookout rafters or lookouts for short. Soffit exposure profile (from wall to fascia) on a building's exterior can vary from a few centimetres (2-3 inches) to 3 feet or more, depending on construction. It can be non-ventilated, or ventilated for cooling attic space. Gutter A rain gutter (also known as eavestrough (especially in Canada), eaves channel guttering or simply as a gutter) is a narrow channel, or trough, forming the component of a roof system which collects and diverts rainwater from the roof. A rain gutter may be constructed in several ways: a roof integral trough along the lower edge of the roof slope which is fashioned from the roof covering and flashing materials. a discrete trough of metal, or other material that is suspended beyond the roof edge and below the projected slope of the roof. a wall integral structure beneath the roof edge, traditionally constructed of masonry, fashioned as the crowning element of a wall. The main purpose of a rain gutter is to protect a building's foundation by channeling water away from its base. They also help to reduce erosion, prevent leaks in basements and crawlspaces, protect painted surfaces by reducing exposure to water, and provide a means to collect rainwater for later use. Rain gutters can be constructed from a variety of materials, including cast iron, lead, zinc, galvanised steel, painted steel, copper, painted aluminium, PVC (and other plastics), concrete, stone, and wood. Water collected by a rain gutter is fed, usually via a downspout (traditionally called a leader or conductor), from the roof edge to the base of the building where it is either discharged or collected. A collection system strategy for water carried from rain gutters may include a rain barrel or a cistern. Bargeboard Bargeboard (probably from Medieval Latin bargus, or barcus, a scaffold, and not from the now obsolete synonym vergeboard) is a board fastened to the projecting gables of a roof to give them strength and to mask, hide and protect the otherwise exposed end of the horizontal timbers or purlins of the roof to which they were attached. Bargeboards are sometimes moulded only or carved, but as a rule the lower edges were cusped and had tracery in the spandrels besides being otherwise elaborated. The richest example in Britain is one at Ockwells in Berkshire (built 1446-1465), which is moulded and carved