By Adalheid Voigt. Midcentury. At Sunday, January 06th 2019, 20:34:52 PM.
There are alternatives to kiln-dried hardwood frames. Metal sofa frames are available, too, but metal can be prone to oxidation along with seasonal changes. Changes in humidity can affect metal frames, so look for one that has been treated to protect against atmospheric changes. Plywood frames as long as they are thick enough can also work well. As a matter of fact, many leading manufacturers now use well-constructed plywood frames.
This drastic reduction in wood´s moisture content is important so that the wood doesn´t warp or shrink with changes in humidity and temperature. Warping or shrinkage can destabilize your sofa, and even cause it to lose its shape. You would not see that happening in a quality sofa. Air drying can also work well, but since often times the process is not controlled enough, so you cannot be sure that the wood‘s moisture content is sufficiently reduced.
In a good-quality frame, the joints get special attention. They are glued, dowelled, and screwed. The corners are further strengthened by the addition of reinforcing blocks for extra support and strength. Generally speaking, plywood and particleboard frames are inferior, especially if they are held together with staples. Additional layers of plywood can help reinforce the frame, so as you can see, construction matters as much as material. If you must choose a sofa with a plywood frame, make sure it has at least 11 to 13 layers of plywood.