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 that 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 those connections in design, construction and maintenance will enhance building strength and longevity.
Figure 3. Truss-to-wall attachment – A truss-bearing block illustrates a likely-inadequate three-nail connection to a post.
Figure 4. Truss-to-wall attachment – knee braces
Figure 5. Roof-purlin attachment – Purlin nailing is shown with inadequate nail embedment.
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Figure 6. Roof-purlin attachment – Metal tie plates or straps
Figure 7. Metal-sheeting attachment – Building wind-load failure happens at the edge of the roof.
Figure 8. Metal-sheeting attachment – A roof section is separated from a building frame by wind.
Figure 9. Connection maintenance – Roof sheeting rusts around fasteners.
Figure 10. Connection maintenance – Truss-plate tooth withdrawal is shown.
