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In addition to wood picket fences, there are country-style split-rail fences, slightly more refined post-and-rail fences, lattice fences, and all kinds of ornamental wood fences.
Log fences or split-rail fences were simple fences constructed in newly cleared areas by stacking log rails. Earth could also be used as a fence; an example was what is now called the sunken fence , or "ha-ha," a type of wall built by digging a ditch with one steep side (which animals cannot scale) and one sloped side (where the animals roam).
Woven wire fencing, many designs, from fine chicken wire to heavy mesh "sheep fence" or "ring fence" Welded wire mesh fence; Wood-panel fencing, whereby finished wood planks are arranged to make large solid panels, which are then suspended between posts, making an almost completely solid wall-like barrier. Usually as a decorative perimeter.
Picket fences can be made of several types of materials. Historically, wood has been the most popular material used for picket fences. This wood can be untreated, treated, or naturally insect and rot resistant. Available non-wood options include vinyl (PVC) and aluminum. [citation needed]
Timber design or wood design is a subcategory of structural engineering that focuses on the engineering of wood structures. Timber is classified by tree species (e.g., southern pine, douglas fir, etc.) and its strength is graded using numerous coefficients that correspond to the number of knots, the moisture content, the temperature, the grain ...
A typical plywood panel has face veneers of a higher grade than the core veneers. The principal function of the core layers is to increase the separation between the outer layers where the bending stresses are highest, thus increasing the panel's resistance to bending. As a result, thicker panels can span greater distances under the same loads.