Rafter Factors
List of common and hip rafter length factors per pitch.
Hardwood
Hardwoods come from any trees which do not produce needles or cones. These trees are most commonly are known as deciduous trees, more scientifically known as angiosperms. Hardwoods are trees which produces leaves and seeds. Common hardwood species include oak, maple, cherry, mahogany, and walnut. Hardwood species are not always necessarily stronger than softwoods, but many species are well known for their beautiful and distinct wood grain patterns.
Engineered Wood
Engineered wood does not occur naturally in the environment but instead are manufactured.
These boards are generally made with wood which is manipulated to have certain qualities or features. Also known as composite wood, these products are often made from the waste wood of sawmills.
Engineered wood is often treated through chemical or a heat process to produce a wood product which can meet certain sizes that would be difficult to achieve from nature.
Popular examples of engineered woods include Plywood, Oriented Strand Board, Medium Density Fiber Board, and Composite Board. Wood veneers can also sometimes be classified as engineered wood, since it often needs to be manipulated either through specialized cutting techniques or joining pieces together to achieve a specific size or wood grain patterning.