By Adalheid Voigt. Midcentury. At Wednesday, January 09th 2019, 01:58:18 AM.
Engineered wood is just what the name implies. It has been engineered to achieve its present form. There are two types of engineered wood, plywood, and particle board. Particle board is not suitable for sofa frames, or any weight bearing frames for that matter because they are made from wood chips and fibers glued together. Plywood is engineered by gluing several thin layers of wood together and can be strong enough for sofa frames depending on the type of wood, and the thickness of the frame.
Wood can hold a lot of moisture when it is first harvested. What makes a kiln-dried frame better is that the process gets rid of most of the moisture inside the wood. Kilns are huge ovens with very strictly controlled temperatures and humidity. The kiln drying process can remove approximately 93% of the wood's moisture.
Hardwood is wood that we get from trees such as oak, maple, cherry walnut and other broad-leafed deciduous trees. This type of wood is stronger and better suited to most types of furniture making. Soft woods come from evergreen trees such as pines and cedar. This type of wood can bend or dent easily and therefore is not suitable where you need strength, such as in sofa frames. So while it is good to look for kiln dried wood, remember to as if the frame is constructed from hardwood rather than soft wood.