Many modern farm buildings built with wooden framing are covered by a skin (or cladding) of ribbed metal sheeting. The combined strength of the framing and metal skin contributes to the economy of this type of building. Some primary structural members, such as wood trusses or laminated wood posts, are pre-fabricated. The majority of the connections between primary structural members, secondary structural members, and the building skin are made in the field, but are critical to the strength of the assembled building. Attention to these connections in design, construction, and maintenance will enhance building strength and longevity.